WO2017080441A1 - Method for finding optical centre of lens, device for selecting shadow computation region for lens and testing surround view video-shooting module, method for testing white balance of surround view video-shooting module, and wide-angle integrating sphere - Google Patents

Abstract

A surround view video-shooting module testing device and test method therefor, which are used for testing a surround view video-shooting module. The surround view video-shooting module testing device comprises a module positioning assembly, a cylinder and a light source, wherein the module positioning assembly is used for positioning the surround view video-shooting module, with the cylinder having a inner surface. The inner surface encircles a cylindrical imaging space, wherein the light source is arranged to provide a uniform light source for the imaging space.

Description

Lens optical center finding method, lens shadow calculation area selection, surround camera module test device, ring camera module white balance test method and wide angle integrating sphere Technical field

The invention relates to the field of imaging, and more particularly to a ring-shaped camera test device and a test method thereof. The invention further provides a white balance test method for a surround view camera module. The present invention further provides a method of finding or determining the optical center of a lens. The present invention further provides a method for selecting a calculation region for calculating a shadow of a lens. The present invention further provides a wide-angle integrating sphere that provides a wide-angle uniform light source.

Background technique

Camera modules are widely used in people's daily life and are no stranger to consumers. With the progress of society, people's lives are becoming more and more colorful. Correspondingly, consumers' requirements for camera modules are becoming higher and more diverse. The traditional camera module's ability to simply record small field of view images is far from meeting the needs of the market. Along with this, various wide-angle lenses and super wide-angle lenses have emerged and become popular among consumers. At the same time, a variety of camera modules and lens applications also bring some new problems to be solved.

Modern people are more and more advocating the way of returning to nature. In addition to the busy work in the metropolis, more and more people choose to do outdoor sports and leisure, such as hiking, cycling, diving, etc., for health and leisure purposes. . As with health, safety is a matter of great concern. For outdoor sports, leisure, especially in the wild and leisure, people need camera modules and corresponding products that can help them observe the surrounding environment to help them observe the surrounding environment, to remind and record the surrounding environment, such as suggesting potential Danger, record the beauty around you, etc.

Being able to record a broader field of view is what consumers expect from a camera module. Wide-angle lenses and super wide-angle lenses on the market have greatly improved compared with traditional lenses in the field of expanding records, and have been widely used in many fields, but there are still many shortcomings, such as the inability to achieve 360° viewing.

Focusing in the production process of the camera module is a very important program in the production process of the camera module, which directly affects the performance of the camera module. After the camera module is adjusted, it is usually necessary to test the performance of the camera module. The resolution and market angle are very important indicators of the camera module.

A conventional method for testing the resolution of a camera module is to place a target on the front side, take a picture, and then collect data according to the respective fields on a rectangular picture and the field of view corresponding to the lens.

With the increasing variety of camera modules and their lenses, their imaging methods are diversified. The structure diagram and imaging principle of the camera module become more complicated. The distortion of the resulting image is also more complicated and serious while obtaining a better viewing angle and a larger field of view. Accordingly, its focus and resolution tests are also difficult to achieve by conventional methods.

The applicant of the present invention is dedicated to researching a camera module, a test device, and a resolution test method that meet market requirements.

Further, with the rapid development of the lens industry, people have higher and higher requirements on the quality of the camera module. One of the important indicators directly related to the quality of the camera module is the level of assembly of the camera module. Eccentricity detection, how to detect such defective products caused by horizontal eccentricity will be the key to ensure product quality. Therefore, it is especially important to study a method that can accurately locate the position of the optical center.

The optical center of the lens is the intersection of the optical axis of the lens optics and the sensor's photosensitive plane. In an ideal camera model, the coordinates of the optical center in the picture are half the width and height of the imaging plane in pixels. During the assembly of the lens, the assembly between the optical component and the Sensor is made for various reasons. There is an error, which will cause the optical center of the lens to be imaged not at the center of the sensor's photosensitive plane. This will affect the imaging quality of the camera module. Therefore, the optical center of the lens should be strictly calibrated. At present, it is generally a method of using a picture to find the optical center of a lens. In this method, first find the brightest area in the center of the picture, then fit it into a circle, find the center of the circle, and then the circle. The center of the circle is the light center of the lens.

Since the method has errors in finding the brightest region and fitting the circle, it is not accurate to find the optical center, and the calculation amount is large. The efficiency of finding the lens optical center is low, and it is urgent to seek a better method to accurately Looking for the lens light heart.

Further, due to the optical characteristics of the lens, different regions of the sensor imaging region receive different light intensities. Generally, the edge region receives less light than the center region, and thus causes uneven brightness in the central region and the edge region of the captured image. During the lens test, the lens shadow, that is, the parameter shading is used. Characterize this phenomenon of lens imaging.

Normally, the shading parameter testing process is as follows: firstly provide a uniform light source, such as a DNP light box; then mount the lens on a shooting device, such as a camera, and cause the shooting device to take a picture on the screen facing the uniform light source; The captured photos are then analyzed by image processing software to obtain lens shading.

It is worth mentioning that the boundary of the ordinary lens forms a rectangular image in the imaging area of the sensor, and the shading of this type of lens is usually used in the process of image analysis processing. The center and the surrounding mesh of the same size, referring to FIG. 19, calculate the shading of different regions by comparing the luminance values of the surrounding mesh images with the luminance values of the central mesh image.

However, when the image formed by the boundary of the lens in the imaging area of the sensor is circular, referring to Figs. 20A and 2B, the above-described rectangular mesh dividing method is obviously not applicable.

When the mesh selection range is small, that is, when the selected mesh is within the imaging circle, the actual imaging area is mostly lost due to the inconsistency of the circular and rectangular images. That is to say, the shading of most of the image areas other than the rectangle cannot be calculated, only the center area is a valid image, and the image of the edge area cannot fully represent the actual image.

When the grid selection range is large, that is, when as many actual images fall into the selected grid, non-actual images appear in the grid, and this part is in the grid area, so it is cumbersome to join. The boundary constraints are excluded from the actual image area, and this meshing method seriously affects the computational efficiency and accuracy of the calculation.

Therefore, no matter how the rectangular mesh area is selected, the rectangular mesh is not suitable for a circular imaging lens.

Further, it is well known that the color presented by an object will follow the ambient light source on the basis of the original color of the object. The color changes automatically and changes. That is to say, the color of the light reflected by the object is affected by the color of the ambient light source. When the human eye sees the object, the human eye automatically corrects the color of the light reflected by the object to minimize the original color of the object. The image sensor of the camera module cannot automatically correct the color of the light reflected by the object like the human eye. Therefore, in order to ensure the imaging quality of the camera module, it is necessary to add a white balance concept to the camera module. By adjusting the white balance of the camera module, the image sensor of the camera module can still obtain after the color of the ambient light source is changed. An image of an object (image or video) with the same primary color of the object. Therefore, whether in the process of manufacturing the camera module or during the use of the camera module, white balance testing and adjustment of the camera module are critical to the imaging quality of the camera module. .

Generally, the imaging area of the prior art camera module is rectangular, and the test method used for white balance testing of the prior art camera module includes the following steps: First, using the prior art camera module An image is taken; secondly, a rectangular test area is captured in the image centered on the center of the image area; finally, the white balance of the prior art camera module is calculated based on the captured test area of the rectangle. However, the test method for performing white balance test on the camera module of the prior art is not suitable for testing the white balance of the surround camera module. Specifically, the imaging area of the surround view camera module is annular, and the center and periphery of the annular imaging area are black areas (also referred to as non-image areas), so when testing using the test method, When a rectangular test area is taken centering on the center of the imaging area, at least a part of the test area of the rectangle has no image, so that the test area of the rectangle cannot be calculated later to obtain the view camera module. Precise white balance parameters.

Further, with the continuous development of information electronics and information technology, people's lives become more and more colorful, and interaction and communication between them are more and more timely and diverse. For example, sharing various information through various social networks.

Among them, camera components such as camera modules are indispensable tools. At present, the camera module of ordinary viewing angle can not meet the needs of people. To meet this demand, a wide-angle or super wide-angle camera module such as a super wide-angle module, a fisheye module, and a 360° panoramic module are generated.

Module detection is an important step in the manufacturing process of the camera module. After testing and judging the various performances of the camera module, it provides consumers with stable and superior camera equipment. The camera module captures the target object by means of the reflection of light, so the light source is an indispensable part during the detection process.

For wide-angle or related camera modules like super wide-angle modules, fisheye modules, 360° panoramic modules, etc., compared with the traditional camera module, it can receive a wider angle of light, so it can shoot a larger angle. target. Accordingly, it is necessary to provide a test light source of a larger angle during the detection process.

A test light source and a test product are mutually compatible. The integrating sphere is a uniform light source that is often used in the detection of a conventional camera module, and provides a uniform outgoing light source by reflecting the structure of the sphere. However, for a conventional integrating sphere or a uniform light source, the light source provided is a plane-based light source, and is only applicable to a common angle of view or a part of a wide-angle module. For the current emerging products, such as a super wide-angle module, a fisheye module, 360 ° Wide-angle or related camera modules such as panoramic modules, traditional integrating spheres or uniform light sources can not meet the test requirements, resulting in camera modules or cameras can not be well tested for images.

Referring to FIG. 31A, the conventional integrating sphere includes a sphere 10P, a light source 20P and a reflector 30P. The sphere 10P has an inlet 11P and an outlet 12P, and the light source is disposed at the entrance position of the sphere. In order to facilitate the incidence of light into the sphere 10P, the reflector 30P is disposed in the sphere 10P at a position opposite to the inlet 11P so as to block direct light entering the sphere 10P. When the camera module is used to test the camera module, the camera module is usually placed at the outlet 12, and the light incident from the light source 20P is reflected by the reflector 30P to the inner wall of the sphere. The reflection of the inner wall of the sphere 10P reaches the other side of the reflector 30P and is reflected by the reflector 30P, and the camera module captures the target of the reflector 30P, thereby passing the captured image. Detecting the performance of the camera module.

It can be clearly seen from the above that the reflector 30P provides a uniform target of the camera module, and the reflector 30P has a plate-like structure, and thus is provided in a plane object of the camera module. Therefore, when the camera module is a wide-angle camera module, the reflector 30P cannot satisfy a larger shooting angle. Therefore, when the conventional integrating sphere is used to detect the camera module, a vignetting or dark side phenomenon occurs in the edge region of the camera module, and the performance of the camera module cannot be well detected.

On the other hand, referring to FIG. 31B, in order to adapt to the existing wide-angle camera module, such as a wide-angle module, a fisheye module, a 360° panoramic module, and the like, a wide-angle or related camera module usually requires a conventional integrating sphere. Or a uniform light source is improved, and the existing analog wide-angle integrating sphere usually has a plurality of said light sources 20P combined and a plurality of said reflecting plates 30P are matched and disposed on said spherical body 10P in different directions at the exit position, thereby providing More angles of light. However, in this way, on the one hand, the structure is complicated, so that the cost is relatively high. On the other hand, in the process of detecting, the detection product itself forms a shadow, thereby affecting the effect of shooting.

Summary of the invention

The main object of the present invention is to provide a surround view imaging test device and a test method thereof, which are suitable for a surround view camera module.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof, which can be used for performing a focus test on a surround view camera module.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof, which can be used to provide a focus and resolution test scheme for a surround view camera module.

Another object of the present invention is to provide a look-around imaging test device and a test method thereof, which accurately determine the resolution level of the camera module by means of software judgment.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof, to ensure that the image resolution of each field of view reaches a preset requirement when an image is acquired by the surround view camera module.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof, which can be used for performing image test on a side annular region of a surround view camera module and solving the problem of coverage of each test area.

Another object of the present invention is to provide a look-around imaging test apparatus and a test method thereof, wherein the coverage problem for each test area is determined by software, and has good accuracy.

Another object of the present invention is to provide a look-around camera test device and a test method thereof, which can determine the annular position of the surround view camera module and the center of the module according to the requirements of the customer and the optical design. distance.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof to ensure the consistency of the final image obtained by looking around the camera module.

Another object of the present invention is to provide a surround-view imaging test device and a test method thereof, which determine whether the angle of view of the eye-view field has been achieved by looking at the original image obtained by looking around the camera module, thereby determining whether the market angle satisfies the requirements. .

Another object of the present invention is to provide a ring-shaped camera test device and a test method thereof, which are a reliable objective evaluation method, which is suitable for line-focusing, image evaluation, and field of view testing of the surround-view camera module. Etc., in turn, can provide a total solution in many ways.

Another object of the present invention is to provide a surround view imaging test apparatus and a test method thereof, which provide a test solution for a surround view type camera module and similar imaging products.

Another object of the present invention is to provide a surround-view imaging test apparatus and a test method thereof, which are suitable for the process inspection of the components of the lens and the inspection of the finished product of the entire lens in the lens supplier and the external inspection of the factory, and the module is The implementation of customer feed inspection provides a uniform test method for the entire production chain.

Another object of the present invention is to provide a surround-view imaging test apparatus and a test method thereof, which establish a research method for production test of a special imaging product, and finally realize the layer-by-layer analysis of the imaging principle and test requirements of these products. Determine the establishment of test methods to provide a common research method for the establishment of test procedures for special products in the future.

Another object of the present invention is to provide a method for finding the optical center of a lens by obtaining the inner boundary of the imaging region or the center of the outer boundary, thereby obtaining the optical center of the lens with high precision.

Another object of the present invention is to provide a method for finding the optical center of a lens, which has a small amount of calculation, a fast calculation, and an accurate calculation result.

Another object of the present invention is to provide a method for finding the optical center of a lens. It is easier to find the inner or outer boundary of the imaging region by using the grayscale contrast between the inner or outer boundary of the imaging region and the imaging region, and looking for the lens. Light is more convenient.

Another object of the present invention is to provide a method for finding the optical center of a lens. By searching for regions of different gradations of the imaged image, the center of the different gradation regions is calculated, thereby obtaining the optical center of the lens, which is simple in calculation and more efficient in operation. high.

Another object of the present invention is to provide a method for finding a lens optical center by binarizing a picture taken by a lens such that an inner boundary or an outer boundary of an imaging region forms a gradient with a gray level of an imaging region, so as to calculate an inner boundary or The coordinates of the outer boundary.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, which form a radial circular network layout in the image, so that sampling points close to the edge region of the test image can be easily obtained. Make shading calculations more accurate.

An object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, which divides an image processing grid by a central radiation method, so that the graphic processing grid is consistent with the lens imaging, thereby more accurately analyzing the lens. Uniformity of imaging.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and The selection method can conveniently select a plurality of grids that change gradually, and can more widely reflect the shading of different regions.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, which have simple boundary restriction conditions, accurate shading calculation, and high calculation efficiency.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, wherein the mesh area is not easily beyond the lens imaging area, and the lens imaging can be accurately reflected.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, wherein the mesh distribution can be imaged in different regions of the lens, and can more comprehensively reflect shading of different regions of the lens.

Another object of the present invention is to provide a calculation area selection layout for calculating a shadow of a lens and a selection method thereof, which are particularly suitable for analyzing the shading of a lens for circular imaging by a circular grid of central radiation.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test method defines a test area in a ring-shaped imaging area of the look-around camera module. The white balance of the surround camera module is tested to improve the accuracy when testing the white balance of the surround camera module.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test method is in real time in the imaging area by using the look-around camera module to capture an image. The test area of the ring is determined such that the test method is real-time when testing the white balance of the look-around camera module.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test method has real-time performance when testing the white balance of the surround view camera module to reduce The time when the surround camera module performs the white balance test and the efficiency when the white balance test is performed on the surround view camera module.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test area is of a moderate size to ensure the accuracy of the white balance test of the surround view camera module. The efficiency of the white balance test of the surround view camera module by the test method is improved.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein when determining the test area, the sum of the inner diameter data and the outer diameter data of the test area is equal to the The sum of the inner diameter data and the outer diameter data of the imaged area to determine the size of the test area.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein after the image forming area is determined, the inner diameter or the outer diameter of the image forming area can be further determined in real time. The center of the imaging region such that when the test region is defined within the imaging region, the center of the test region is made coincident with the center of the imaging region. In other words, after the imaging area is determined, the test area is defined within the imaging area centering on the center of the imaging area.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test method can test the look-around camera mode by automatically calculating the pixel value of the test area. The white balance of the group. For example, by calculating the average value of R, G, and B of the test area, and calculating the values of R/G and B/G, the white balance of the look-around camera module can be obtained.

Another object of the present invention is to provide a white balance test method and an automatic adjustment method for a surround view camera module, wherein the test method can properly control the white balance of the surround view camera module to ensure the look-around camera module. Imaging quality. For example, after obtaining the R/G and B/G values of the surround view camera module, it can be determined whether the R/G and B/G values are within a reasonable range. In this way, the surround view camera module can be ensured. Imaging bottle.

Another object of the present invention is to provide a wide-angle integrating sphere that provides a spherical imaging surface to increase the ingestible angle and to accommodate the wide-angle camera module.

Another object of the present invention is to provide a wide-angle integrating sphere, wherein the wide-angle integrating sphere includes an inner ball and an outer ball, the inner ball is located in the outer ball, and the outer ball reflects light into the inner ball. The test product is adapted to be placed within the inner ball to provide a spherical photographing surface through the inner wall of the inner ball.

Another object of the present invention is to provide a wide-angle integrating sphere, wherein the wide-angle integrating sphere includes a light source and a stop, the outer ball has a light source inlet, and the light source is disposed at the light source inlet, the stop The light is disposed in the outer ball, opposite to the light source inlet, between the inner ball and the light source inlet, and blocks direct light entering the outer ball to directly reach the inner ball.

Another object of the present invention is to provide a wide-angle integrating sphere wherein the stop is spherical in shape to match the inner ball to better block direct light and to provide uniform reflected light to the inner ball.

Another object of the present invention is to provide a wide-angle integrating sphere in which the inner ball is translucent such that light is reflected by the outer ball into the inner ball to form a spherical uniform light source.

Another object of the present invention is to provide a wide-angle integrating sphere, wherein the inner ball has an inner wall and an outer wall, and both the inner wall and the outer wall have a plating layer such that light transmitted through the inner ball is uniform.

Another object of the present invention is to provide a wide-angle integrating sphere, wherein the inner ball has a detecting port, the outer ball has a window, and the detecting port is opposite to the window, so that the detecting can be performed through the window The product is fed into the detection port.

Another object of the present invention is to provide a wide-angle integrating sphere, wherein the wide-angle integrating sphere includes a first hemisphere and a second hemisphere, the second hemisphere is detachably coupled to the first hemisphere, and the first The hemisphere forms the sealed inner space to provide a closed detection environment.

To achieve the above objective, the present invention provides a surround view camera module test apparatus for testing a surround view camera module, which includes a module positioning assembly, a cylinder, and a light source. The module positioning component is used to position the surround camera module. The cylinder has an inner peripheral surface. The inner peripheral surface encloses a cylindrical imaging space. The light source is arranged to provide a uniform source of light for the imaging space.

According to an embodiment of the invention, when the surround camera module is tested, the imaging space is a closed space. The surround camera module is disposed at a center of a diameter of the closed space.

According to an embodiment of the invention, the cylinder comprises a barrel body and a door. The barrel body has an opening. The size and shape of the door is adapted to the size and shape of the opening to enable closure of the opening.

According to an embodiment of the invention, the surround view camera module test device further includes a top plate. The top plate is tightly placed at the top end of the cylinder. The top plate has a top plate aperture. The shape and size of the top plate aperture are adapted to the shape and size of the cylinder.

According to an embodiment of the invention, the light source is disposed on the top plate. Light emitted by the light source passes through the top plate aperture and uniformly illuminates the imaging space. The light source is capable of closing the top of the cylinder.

According to an embodiment of the invention, the surround view camera module testing device further includes a bottom plate. The bottom plate is disposed at the bottom end of the cylinder.

According to an embodiment of the invention, the surround view camera module testing device further includes a first door rail and an at least first door connector. The first door rail is disposed at the door. The first door connector is disposed on the top plate. The connector is movable along the slide rail.

According to an embodiment of the invention, the surround view camera module testing device further includes a second door rail and an at least second door connector. The second door rail is disposed on the bottom plate. The first door connector is disposed to the door. The connector is movable along the slide rail.

According to an embodiment of the invention, the first door connector has a first door chute. The first slide rail is disposed in the first door chute.

According to an embodiment of the invention, the second door connector has a second door chute. The second slide rail is disposed in the second door chute.

According to an embodiment of the invention, the surround view camera module test device further includes a support device. The cylinder is placed on the support device. The support device includes a light blocking assembly. The light blocking assembly includes a light-shielding bottom. The light-shielding bottom is arranged to close the bottom of the cylinder.

According to an embodiment of the invention, the door comprises a panel, a skeleton and a cover. The skeleton is disposed between the panel and the outer cover and fixes and supports the panel and the outer cover.

According to an embodiment of the invention, the panel, the skeleton and the outer cover are all made of sheet metal.

According to an embodiment of the invention, the skeleton comprises a plurality of square tubes and a plurality of shaped elements. The square tube connects and secures the shaped element.

According to an embodiment of the invention, the module fixing assembly comprises a module fixing component, an adjusting component, a moving component and a guiding component. The module fixing element is disposed on the adjustment element. The moving element is disposed on the guiding element and is movable along the guiding element. The adjustment component is used to adjust the concentricity of the surround view camera module with the imaging space. The moving component is used to drive the surround camera module to move within the imaging space.

According to an embodiment of the invention, the module fixing assembly further includes a limiting component. The guiding element has a limiting end. The limiting element is disposed at the limiting end of the guiding element.

According to an embodiment of the invention, the module fixing element has an intake passage. The suction passage has a module connection port and an intake port. The suction port and the module connection port communicate with each other.

According to an embodiment of the invention, the light source has an effective area of 1 m x 1 m, a thickness of 6 mm, and a color temperature of 5000 K.

According to an embodiment of the invention, the module positioning component is embodied as a USB 3.0 focusing tool.

According to an embodiment of the invention, the surround view camera module test device further includes a target. The A target plate is disposed on the inner peripheral surface of the cylinder. The target is a reflective target.

According to an embodiment of the invention, the target is a gradual anti-distortion target.

According to an embodiment of the invention, the target comprises a series of lateral reflective strips. The width of the reflective strip can be obtained by inverse distortion calculation, so that the thickness of the imaged line in the original image formed by the target through the surround camera module is consistent.

According to an embodiment of the invention, the target comprises a first reflective strip and a second reflective strip. The first reflective strip and the second reflective strip are configured to be used to test a range of field of view of the surround view camera module.

According to an embodiment of the invention, the support device further comprises a bracket. The light blocking assembly is disposed on the bracket. The light barrier assembly further includes a series of panels and a light barrier. The shroud is placed around the cylinder. The light blocking top is placed on top of the bracket. The door, the coaming plate, the light-shielding top and the light-shielding bottom together form an anti-interference space.

According to an embodiment of the invention, the support device further comprises a bracket and four support legs. The support foot is disposed on the bracket to provide support for the bracket and is used to adjust the standing smoothness of the bracket.

According to another aspect of the present invention, the present invention provides a method for testing a surround view camera module, which is used for testing a surround view camera module, and includes the following steps:

A. The look-around camera module W is disposed at a center of a diameter of a cylindrical imaging space;

B. Closing the imaging space;

C, a light source emits uniform light and illuminates a target plate and then reaches the surround view camera module W;

D. The surround camera module responds to the uniform light reflected by the target, and then performs photoelectric conversion to record an original image;

E. performing distortion correction on the original image; and

F. Determine whether the resolution and the angle of view of the surround view camera module meet the requirements by using the image corrected by the original image.

According to an embodiment of the invention, step C is embodied as follows: the target reflects the uniform light emitted by the light source to the surround camera module.

According to an embodiment of the invention, step C is embodied as follows: a series of reflective strips of the target reflect uniform light emitted by the light source to the surround camera module.

According to one embodiment of the invention, the method of performing distortion correction on the original image in step E is software detection and correction.

In order to achieve other objects and advantages of the present invention, the present invention further provides a method of finding or determining an optical center, using the lens to take a picture, the method comprising the steps of:

(A) binarizing the picture to find coordinates of at least one inner boundary or at least one outer boundary of an imaged region in the image;

(B) fitting the inner boundary or the outer boundary into at least one inner circle or at least one outer circle, and determining coordinates of a center of each inner circle or each outer circle in an image;

(C) The center of the inner circle or the center of the outer circle is defined as the optical center of the lens.

Wherein the gray boundary is formed between the inner boundary or the outer boundary and the gray value of the imaging region, With grayscale contrast.

According to an embodiment of the invention, the imaging region, the inner boundary or the outer boundary is a circular region.

In the step (B), the inner circle or the outer circle is obtained by fitting using an average value method, a weighted average method, or a least squares method.

Wherein the color of the inner boundary or the color of the outer boundary is different from the color of the imaged area.

According to an embodiment of the invention, the imaging area is a white area, the inner boundary is a black area, and the outer boundary is a green area.

According to an embodiment of the invention, the imaging area is a white area, the inner boundary is a green area, and the outer boundary is a black area.

According to an embodiment of the invention, the imaging area is a white area, and each of the inner boundaries is an area where green and black are alternated, and each of the outer boundaries is an area where green and black alternate.

According to an embodiment of the invention, the imaging area is a white area, and the inner boundary and the outer boundary are both green areas or black areas.

The present invention further provides a method of finding or determining an optical center, using the lens to take a picture, characterized in that the method comprises the following steps:

(a) binarizing the picture to find coordinates of at least one inner boundary or at least one outer boundary of an imaging region in the image;

(b) fitting the inner boundary or the outer boundary into at least one inner polygon or at least one outer polygon, and determining coordinates of a center of each of the inner polygons or each of the outer polygons in an image;

(c) Deriving the center of each of the inner polygons or the outer polygons to obtain the optical center of the lens.

Further comprising a step (d): forming an inscribed circle of each of the inner polygons or a circumcircle of each of the outer polygons, and determining coordinates of each of the inscribed circles or the center of each of the circumscribed circles in the image Deriving a center of each of the inscribed circles or each of the circumscribed circles to obtain an optical center of the lens, wherein the step (d) is after the step (c), or the step (d) is located Between the step (b) and the step (c), and further combining the center of the inner polygon or the outer polygon in the step (c), the optical center of the lens is obtained.

Wherein the inner boundary or the outer boundary forms a grayscale gradient with the grayscale value of the imaging region, with grayscale contrast.

Wherein the imaging area, the inner boundary or the outer boundary is a polygonal area.

According to an embodiment of the invention, the inner or outer boundary is an equilateral triangle, a square, a diamond, an equilateral triangle, a pentagon or a hexagon, and other polygons.

Wherein the color of the inner boundary or the color of the outer boundary is different from the color of the imaged area.

According to an embodiment of the invention, the imaging area is a white area, the inner boundary is a black area, and the outer boundary is a green area.

According to an embodiment of the invention, the imaging area is a white area, the inner boundary is a green area, and the outer boundary is a black area.

According to an embodiment of the invention, the imaging area is a white area, and each of the inner boundaries is an area where green and black are alternated, and each of the outer boundaries is an area where green and black alternate.

In order to achieve the other objects and advantages of the present invention, the present invention further provides a calculation area selection layout for lens shading, which is applied to a circular test image including at least one reference area and at least one test area, wherein the reference area is A circular shape is located in a central area of the test image, and the test area is circular and located at a predetermined test position within the test image.

According to an embodiment of the invention, the above arrangement includes a plurality of said test zones evenly distributed within said test image.

According to an embodiment of the invention, the above arrangement includes a plurality of said test zones distributed radially in a radial direction to said test image.

According to an embodiment of the invention, the above arrangement includes a plurality of said test zones symmetrically distributed around said reference zone.

According to an embodiment of the present invention, the above arrangement, wherein the reference area and the center of the test image are the same.

According to an embodiment of the invention, the above arrangement, wherein the plurality of test zone centers are located on a gradient ring, the gradient ring being the same as a center of the reference zone.

According to an embodiment of the present invention, the above arrangement, wherein the plurality of the test areas are divided into a plurality of gradient portions, the test areas of the same gradient portion are the same distance from the reference region, and the different gradient portions are The distance of the test zone from the reference zone is different.

According to an embodiment of the present invention, the above layout includes a plurality of the reference regions symmetrically distributed in a central region of the test image.

According to an embodiment of the present invention, the above arrangement, wherein a plurality of the test zones are symmetrically distributed outside the reference zone.

The invention also provides a method for selecting a calculation area layout of a lens shadow, the method comprising the following steps:

(A) obtaining a central coordinate O ₁ (x, y) of a circular test image and a radius R;

(B) taking a center O ₁ (x, y) of the test image as a center, taking r as a radius, taking a circular reference region; and

(C) taking a circular test area having a radius r outside the reference area within the test image.

According to an embodiment of the invention, in the above selection method, the selection of the radius r in the step (B) is based on the radial pixels of the test image.

According to an embodiment of the present invention, in the above selection method, the step (C) includes the step of: determining a center coordinate O ₂ (x2, y2) of any of the test areas 20D to a center of the test image 100D O ₁ (x1, y1) is the center of the circle, and a gradient ring is taken with a radius of O ₁ O ₂ .

According to an embodiment of the present invention, in the above selection method, the step (C) includes the steps of: taking different positions on the gradient ring 202D at different positions with respect to the reference region symmetry, taking a radius r The test area.

According to an embodiment of the present invention, in the above selection method, wherein the step (C) comprises the steps of: A plurality of the gradient rings of different radii are taken, and the test zones are respectively taken at corresponding positions on different gradient rings.

According to an embodiment of the present invention, the selecting method includes the step (D) of acquiring the brightness values of the test area and the reference area, respectively, thereby obtaining a lens shading value.

In order to achieve other objects and advantages of the present invention, the present invention further provides a white balance test method for a surround view camera module, wherein the test method includes the following steps:

(a) defining an annular test area within the imaging area centering on a center of the annular imaging area of the surround view camera module;

(b) testing the white balance of the surround view camera module by calculating the pixel values in the test area.

Further, the present invention further provides a white balance automatic adjustment method for a surround view camera module, wherein the automatic adjustment method includes the following steps:

(A) defining an annular test area in the imaging area centering on a center of the annular imaging area of the surround view camera module;

(B) testing the white balance of the surround view camera module by calculating the pixel values in the test area;

(C) automatically and in real time adjusting the white balance of the surround view camera module based on the test result of the white balance of the surround view camera module.

In order to achieve other objects and advantages of the present invention, the present invention further provides a wide-angle integrating sphere comprising: an outer ball, a blocking member and an inner ball; wherein the inner ball has an inner space, a light source inlet and a window The blocking member and the inner ball are disposed in the outer ball, and the blocking member is located between the light source inlet and the inner ball, so as to block light entering from the light source inlet from directly reaching the In the inner ball, the inner ball has a detection port corresponding to the window of the outer ball, so as to place a detection product on the detection port of the inner ball through the window And the inner ball is a semi-transmissive ball, so that the light diffused and reflected by the outer ball and the blocking member passes through the inner ball to provide a wide-angle uniform light source for the detecting product.

According to an embodiment of the invention, the outer sphere of the wide-angle integrating sphere is an opaque sphere to facilitate isolation of external light to provide a closed environment for the inner sphere.

According to an embodiment of the invention, the outer ball of the wide-angle integrating sphere has an outer wall of the outer ball, and the inner wall of the outer ball has a plating layer to facilitate uniform reflection of light.

According to an embodiment of the present invention, the inner ball includes an inner ball inner wall and an inner ball outer wall, and the inner ball inner wall and the inner ball outer wall have a plating layer to facilitate uniform light. Entering the inner ball and uniformly reflecting within the inner ball.

According to an embodiment of the invention, the plating layer of the inner ball in the wide-angle integrating sphere is a Baso4 plating layer.

According to an embodiment of the invention, the center of the light source inlet, the geometric center of the block, and the center of the inner ball are in the same straight line in the wide-angle integrating sphere, so that the light received by the inner ball is uniform.

According to an embodiment of the invention, the wide-angle integrating sphere includes a light source, the light source, and the light A source is mounted to the light source inlet of the outer bulb.

According to an embodiment of the invention, the wide-angle integrating sphere comprises a controller, and the controller is communicatively coupled to the light source to facilitate controlling the operation of the light source to adapt to the detection requirements of different detection products.

According to an embodiment of the invention, the light source in the wide-angle integrating sphere is an LED light source.

According to an embodiment of the invention, the wide-angle integrating sphere includes a bracket, and the outer ball is mounted to the bracket.

According to an embodiment of the present invention, the bracket of the wide-angle integrating sphere includes a bracket body and a set of walking wheels, the outer ball is mounted on the bracket body, and the traveling wheel is mounted on the bracket Below the main body, in order to support the wide-angle integrating sphere to walk.

According to an embodiment of the present invention, in the wide-angle integrating sphere, the blocking member is a curved surface structure, a convex side surface of the curved surface structure is opposite to the light source inlet, and a concave side surface of the curved surface structure is The inner ball is opposite.

According to an embodiment of the invention, the blocking member in the wide-angle integrating sphere is a spherical surface.

According to an embodiment of the invention, the surface of the stopper in the wide-angle integrating sphere has a plating layer.

According to an embodiment of the invention, the outer ball in the wide-angle integrating sphere includes a first outer hemisphere and a second outer hemisphere, and the second outer hemisphere is detachably connected to the first outer hemisphere to form The inner space.

According to an embodiment of the invention, the second outer hemisphere of the wide-angle integrating sphere is connected to the first outer hemisphere by screwing.

According to an embodiment of the invention, in the wide-angle integrating sphere, the blocking member is mounted on an inner side of the first hemisphere by a mounting bracket, and the inner ball is mounted inside the second hemisphere.

According to an embodiment of the invention, the inner ball of the wide-angle integrating sphere is integrally formed by means of 3D printing.

According to an embodiment of the invention, the outer ball 3D of the wide-angle integrating sphere is integrally formed by printing.

According to an embodiment of the invention, the inner ball of the wide-angle integrating sphere is fixed to the inside of the outer ball by screwing.

According to an embodiment of the present invention, the detecting port of the inner ball in the wide-angle integrating sphere forms an extension duct communicating with the window of the outer ball, and the extension duct is screwed to the window position.

DRAWINGS

Figure 1 illustrates a look-around camera module in accordance with the present invention.

2 is a schematic diagram of an imaging principle of the above-described surround view camera module according to the present invention.

3A is a schematic diagram of an original image taken by the above-described surround view camera module in accordance with the present invention.

FIG. 3B illustrates an image diagram of an image captured by the surround view camera module being corrected.

4A and 4B are schematic views of a look-around imaging test apparatus in accordance with a first preferred embodiment of the present invention.

FIG. 5A is a schematic diagram of a sliding door of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention.

5B, 5C, and 5D are schematic diagrams showing the arrangement of the sliding door of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention.

Figure 6 illustrates the arrangement of a light source and a module positioning assembly of the look-around camera test apparatus in accordance with the above-described first preferred embodiment of the present invention.

7A is a perspective view of the module positioning assembly of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention.

Figure 7B is an exploded view of the module positioning assembly of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention.

8A and 8B illustrate a module fixing member of the module positioning assembly of the look-around imaging test apparatus according to the above-described first preferred embodiment of the present invention.

9A and 9B illustrate a target plate applied to the look-around imaging test apparatus according to the above-described first preferred embodiment of the present invention.

Figure 10 illustrates a method of testing a look-around camera module in accordance with the above-described first preferred embodiment of the present invention.

Figure 11 is a schematic illustration of a forming model in accordance with a second preferred embodiment of the present invention.

Figure 12 is a flow chart of finding a lens optical center in accordance with the above second preferred embodiment of the present invention.

Figure 13 is a variant embodiment of the above second preferred embodiment of the present invention.

Figure 14 is a flow chart for finding a lens optical center in accordance with a variant embodiment of the above second preferred embodiment of the present invention.

Figure 15 is a schematic illustration of an imaging model in accordance with a third preferred embodiment of the present invention.

Figure 16 is a flow chart for finding a lens optical center in accordance with the above-described third preferred embodiment of the present invention.

Figure 17 is a variant embodiment of the above described third preferred embodiment of the present invention.

Figure 18 is a flow chart for finding the optical center of a lens according to a modified embodiment of the above-described third preferred embodiment of the present invention.

Figure 19 is a schematic illustration of a prior art rectangular imaging lens shading image processing grid.

20A, 20B are schematic illustrations of a shading image processing grid of a prior art circular imaging lens.

Figure 21 is a schematic illustration of a lens shading test apparatus in accordance with a fourth preferred embodiment of the present invention.

Figure 22 is a schematic illustration of a lens shading test process in accordance with the above-described fourth preferred embodiment of the present invention.

Figure 23 is a diagram showing the layout of a calculation area grid for calculating lens shading according to the above-described fourth preferred embodiment of the present invention.

24A to 24E are calculation area grid layout forming processes for calculating lens shading according to the above-described fourth preferred embodiment of the present invention.

Figure 25 is a block diagram showing a method of forming a calculation area grid layout for calculating a lens shading according to the above-described fourth preferred embodiment of the present invention.

FIG. 26 is a schematic diagram showing the imaging principle of a surround view camera module according to a fifth preferred embodiment of the present invention.

Figure 27 is a plan view showing an imaging area of a surround view camera module in accordance with a fifth preferred embodiment of the present invention.

28 is a schematic plan view showing the relationship between a test area and an imaging area of the surround view camera module according to the fifth preferred embodiment of the present invention.

29 is a white balance test flow of the surround view camera module according to the fifth preferred embodiment of the present invention; Block diagram.

30 is a block diagram showing a white balance test method of a surround view camera module according to a fifth preferred embodiment of the present invention.

31A and 31B are schematic views of an integrating sphere of the prior art.

Figure 32 is a perspective view of a wide angle integrating sphere in accordance with a sixth preferred embodiment of the present invention.

Figure 33 is a cross-sectional view showing a wide-angle integrating sphere according to a sixth preferred embodiment of the present invention described above.

Figure 34 is an exploded perspective view of a wide-angle integrating sphere according to the sixth preferred embodiment of the present invention described above.

Figure 35 is a schematic view showing the manner of light propagation of a wide-angle integrating sphere according to the sixth preferred embodiment of the present invention described above.

Detailed ways

The following description is presented to disclose the invention to enable those skilled in the art to practice the invention. The preferred embodiments in the following description are by way of example only, and other obvious variations will occur to those skilled in the art. The basic principles of the invention as defined in the following description may be applied to other embodiments, modifications, improvements, equivalents, and other embodiments without departing from the spirit and scope of the invention.

It should be understood by those skilled in the art that in the disclosure of the present invention, the terms "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", " The orientation or positional relationship of the indications of "upright", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or positional relationship shown in the drawings, which is merely for convenience of description of the present invention and The above description of the invention is not to be construed as a limitation of the invention.

It will be understood that the term "a" is understood to mean "at least one" or "one or more", that is, in one embodiment, the number of one element may be one, and in other embodiments, the element The number can be multiple, and the term "a" cannot be construed as limiting the quantity.

1 and 2 of the accompanying drawings illustrate a surround view camera module W and its imaging principle in accordance with the present invention. As shown in the figure, the surround view camera module W includes a curved reflective element 1, a planar retroreflective element 2 and a photosensitive element 3, wherein the curved reflective element 1 is provided with a through hole 4. As shown, the curved reflective element 1 is capable of receiving 360° ambient light and reflecting it to the planar light reflecting element 2, and is further reflected by the planar light reflecting element 2, passes through the through hole 4, and is used by the photosensitive element 3. It is received to capture a 360° view around the curved reflector element 1.

Figure 3A is a schematic illustration of an original image taken by the above-described surround view camera module in accordance with the present invention. 3A, the P of the original image may be divided into three regions: a region M _1, M _2, and an area of a region M _3, wherein M ₁ is the region without the imaging region. The region M ₂ is a complete image which is reflected on the photosensitive element 3 after the light is reflected by the curved light reflecting element 1 and then reflected by the planar light reflecting element 2 and then passes through the through hole 4. The region M ₃ is an image formed by the light that is directly reflected by the planar light reflecting element 2 to the photosensitive element 3 without passing through the curved reflective element 1 , that is, the region M _{3 is} the lower component of the camera module. The image reflected by the planar light reflecting element 2.

As shown, this area M ₂ is circular. That is to say, the imaging area of the look-around camera module W is the annular area M ₂ . In this case, traditional focusing and testing methods are not feasible.

It is worth mentioning that the above-mentioned surround camera module W is only for the purpose of clearly describing the present invention. An example and not limitation of the look-around camera test device and its focusing method and test method. The surround view imaging test apparatus and the focus adjustment method and test method thereof according to the present invention can be applied to the above-described surround view camera module W according to the present invention, and can also be applied to other surround view camera modules W. The present invention does not Restricted.

According to the imaging principle of the surround view camera module W, the image test of the surround view camera module W of the present invention can solve the following two problems:

1. Resolution test: The test area is concentrated in the M ₂ portion of the original image. In the physical direction, the object of the region M ₂ is actually at a position around the circumference of the curved reflecting element 1 . Determine the distance of the annular position from the center of the module as needed and the result of the optical design. In order to ensure the consistency of the final image, it is necessary to ensure that the gradient range of the clarity of each region is not too large.

2. Field of view test: Since the size of the area M ₂ reflects whether the requirement of the viewing angle of the ring meets the requirements, it is necessary to ensure the size of the area M ₂ , so it is necessary to judge whether the inner and outer circles of the area M ₂ are covered by the original image. The required angle of view is reached.

4A and 4B are schematic views of a look-around imaging test apparatus in accordance with a first preferred embodiment of the present invention.

As shown, the look-around camera test apparatus includes a support device 10, a cylinder 20, a module positioning assembly 30, and a light source 40. The cylinder 20 has an inner peripheral surface 201. The inner peripheral surface 201 of the cylinder 20 surrounds a cylindrical imaging space 200 to accommodate the 360-degree imaging characteristics of the surround camera module W. More specifically, the size of the diameter D of the imaging space 200 is set according to the preset focus distance of the look-around camera module W. That is to say, the size of the diameter D of the imaging space 200 can be set according to the needs of the market and the consumer for the look-around camera module W. Preferably, the diameter D of the imaging space 200 is twice the focusing distance of the surround camera module W. The height of the cylindrical imaging space 200 can be determined according to the size of the diameter D of the imaging space 200 and the preset viewing angle of the viewing camera module W, so that the inner circumferential surface 201 is just at the camera module W. The photosensitive element 3 is completely imaged. It is worth mentioning that, when determining the height of the imaging space 200, the size design of the inner peripheral surface 201 of the cylinder 20 can be completely imaged on the photosensitive element 3 of the camera module W. Achieve good focus test results without wasting raw materials. It should be understood by those skilled in the art that the height of the imaging space 200 can also be greater than the height at which the inner circumferential surface 201 of the cylinder 20 can be completely imaged on the photosensitive element 3 of the camera module W, that is, A part of the inner peripheral surface 201 can be imaged on the photosensitive element 3 of the camera module W, and the other portion is beyond a range that can be imaged on the photosensitive element 3 of the camera module W.

It is worth mentioning that the image captured during the focus measurement of the surround camera module W is distorted. Therefore, when performing the focus test on the surround camera module W, the present invention uses a standard 50. The target 50 is illustrated in Figures 9A and 9B of the accompanying drawings. As shown in FIG. 9A, the target 50 is a graded anti-distortion target. When the surround view camera module W is subjected to a focus test, the target plate 50 is uniformly disposed on the inner peripheral surface 201 of the cylinder 20. The size of the target 50 is adapted to the size of the inner peripheral surface 201 of the cylinder 20. Specifically, the width L of the target 50 is adapted to the size of the inner peripheral surface 201 of the cylinder 20 such that the target 50 can just cover one week of the inner peripheral surface 201 of the cylinder 20. The height of the target 50 H is adapted to the height of the inner peripheral surface 201 of the cylinder 20.

More specifically, in accordance with this first preferred embodiment of the present invention, the target 50 employs a reflective target. As shown, the target 50 includes a series of lateral reflective strips 51. As shown, the series of lateral reflection strips 51 differ in thickness. According to the first preferred embodiment of the present invention, the width of the series of lateral reflection strips 51 is obtained by inverse distortion calculation, and the thickness of the imaged lines in the original image formed by the target camera 50 through the look-around camera module W can be made uniform. According to the first preferred embodiment of the present invention, the series of lateral reflection strips 51 includes a first limiting reflective strip 51a, a second limiting reflective strip 51b and a plurality of intermediate reflective strips 51c. The intermediate reflection strip 51c is disposed between the first limit reflection strip 51a and the second limit reflection strip 51b. The arrangement of the first limit reflection strip 51a and the second limit reflection strip 51b is used to test the range of the angle of view of the surround view camera module W.

It is worth mentioning that in order to better describe the target 50, FIG. 9A illustrates a planar development of the target 50. In use, the target 50 is evenly disposed on the inner peripheral surface 201 of the cylinder 20, which is cylindrically disposed as shown in Fig. 9B.

In the imaging environment of the camera module W, it is necessary to increase the light source, otherwise the brightness is insufficient to complete the focusing. In addition, external light has a great influence on the focusing parameters.

Correspondingly, the light source 40 of the look-around camera test device is arranged to add a light source to the imaging environment of the look-around camera module W.

Specifically, as shown, the support device 10 includes a bracket 11 and a light blocking assembly 12. The light blocking assembly 12 is disposed on the bracket 11. The light blocking component 12 is configured to prevent the focusing and testing process from being affected by an external light source during focusing and testing of the viewing camera module W.

As shown, the cylinder 20 includes a barrel body 21 and a door 22. The cartridge body 21 has an opening 210 for facilitating the module positioning assembly 30 to enter and exit, thereby facilitating the viewing and output of the viewing camera module W. The door 22 is adapted to the size and shape of the opening 210 to close the opening 210 during testing of the viewing camera module W to enclose the imaging space 200. It is worth mentioning that when the door 22 closes the opening 210 of the barrel body 21, the inner surface of the door 22 and the inner surface of the barrel body 21 together form the inner circumferential surface 201 of the cylinder 20. The shape of the inner peripheral surface 201 coincides with the shape of the circumferential surface of the cylinder to ensure the accuracy of the focus test.

FIG. 5A is a schematic diagram of a sliding door of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention. As shown, the door 22 includes a panel 221, a skeleton 222, and a housing 223, wherein the skeleton 222 includes a plurality of square tubes 2221 and a plurality of shaped elements 2222. The shaping elements 2222 are arranged in parallel so as to be able to provide support to the panel 221 and fix the panel to a predetermined arc and the inner surface of the door 22 formed by the inner surface of the panel 221 and the inner surface of the barrel body 21. Adapted. The square tube 2221 connects and fixes the shaped element 2222 to fix the shaped element 2222 in a preset state, thereby providing support for the panel 221 and the outer cover 223. According to the first preferred embodiment of the present invention, the plate 221, the skeleton 222 and the outer cover 223 are all made of sheet metal. First, the shaping element 2222 of the skeleton 222 is connected to the outer cover 223 by screwing, and then the square tube 2221 of the skeleton 222 is welded to the shaping element 2222 by a welding machine to form the skeleton 222, and the panel is further 221 is welded according to the inner contour of the skeleton 222 to form the door 22 as shown in Fig. 5A.

5B, 5C and 5D illustrate schematic views of the arrangement of the sliding door of the look-around imaging test apparatus according to the above first preferred embodiment of the present invention. As shown, the door 22 is assembled with the barrel body 21 of the cylinder 20 by a linear slide rail to achieve smooth sliding thereof.

Figure 6 illustrates the arrangement of the light source 40 and the module positioning assembly 30 of the look-around camera test apparatus in accordance with the above-described first preferred embodiment of the present invention. As shown in FIG. 4B and FIG. 6 , the light source 40 is disposed directly above the module positioning component 30 to provide a uniform light source effect to the surrounding environment of the module positioning component 30, thereby achieving a good focusing effect. .

As shown in FIG. 6, the look-around imaging test apparatus further includes a top plate 60 and a bottom plate 70. The top plate 60 and the bottom plate 70 are respectively tightly disposed at the top of the cylinder 20 and the bottom of the cylinder 20.

The surround camera module testing device further includes a first door rail 80a, a second door rail 80b, at least one first door connector 90a and at least one second door connector 90b. The first and second door connecting members 90a, 90b are respectively provided with a first door sliding slot 901a and a second door sliding slot 901b. The first and second door rails 80a, 80b are respectively adapted to the first door sliding slot 901a and the second door sliding slot 901b to be able to be in the first door sliding slot 901a and the second door sliding slot 901b. The inside slides to further slide the door 22 relative to the barrel body 21. More specifically, in accordance with this first preferred embodiment of the present invention, the first door connector 90a is securely disposed to the top panel 60. The first door rail 80a is disposed at the door 22. The second door connector 90b is securely disposed to the door 22. The first door rail 80a is disposed on the bottom plate 70. Those skilled in the art should understand that such an arrangement is merely an example and not a limitation of the invention. According to other first preferred embodiments of the present invention, the first door connector 90a may be securely disposed on the door 22; the first door rail 80a may be disposed on the top plate 60. The second door connecting piece 90b may also be firmly disposed on the bottom plate 70; the first door sliding rail 80a may be disposed on the door 22. The invention is not limited in this respect.

According to this first preferred embodiment of the invention, the light source 40 has an effective area of 1 m x 1 m, a thickness of 6 mm, and a color temperature of 5000 K. The light source 40 is a uniform light source, so that the surround view camera module W is under a uniform light source, thereby implementing a module OTP (one-time programming) operation. The light source 40 illuminates the target 50 disposed on the inner peripheral surface 201 of the cylinder 20 by reflection, so that the reflective strip 51 of the target 50 reflects light to the surround camera module W, and then passes through The surround camera module W is imaged.

7A and 7B illustrate the module positioning assembly 30 of the look-around imaging test apparatus according to the above-described first preferred embodiment of the present invention. As shown, the module positioning assembly 30 includes a module fixing member 31, an adjusting member 32, a moving member 33, a guiding member 34, and a limiting member 35. According to the first preferred embodiment of the present invention, the module fixing member 31 is used to fix the surround camera module W. The module fixing component 31 is disposed on the adjusting component 32 to adjust the position of the module fixing component 31 by the adjusting component 32, and further adjust the looking camera module W disposed on the module fixing component 31. The position is adjusted to adjust the concentricity of the camera module W and the cylinder 20, so that the focus measurement of the surround camera module W is more accurate and effective. The moving element 33 is disposed on the guiding element 34 to be movable along the route and direction guided by the guiding element 34 and thereby to drive the adjusting component 32, the module fixing component 31 and the module fixing component 31. The camera module W moves along a preset route and direction, thereby driving the surround camera module W into the imaging space 200 and forming The image space 200 moves to a preset test position, and the surround camera module W is driven to output the image space 200.

The limiting element 35 is disposed on the guiding element 34 to limit the extent to which the moving element 33 is guided by the guiding element 34. More specifically, the guiding element 34 has a limiting end 341. The limiting element 35 is disposed at the limiting end 341. When the moving element 33 moves to the limiting end 341 of the guiding element 34, it is restricted by the limiting element 35 and cannot continue to move in the same direction, thereby fixing the position of the moving element 33, thereby fixing the position The focus position of the camera module W is viewed, thereby achieving the focusing consistency of different camera modules.

According to this first preferred embodiment of the invention, the guiding element 34 is embodied as a slide rail. The moving element 33 has a chute 330. The moving element 33 is sleeved on the sliding rail through the sliding slot 330 to move along the sliding rail. It is worth mentioning that the shape and size of the chute 330 are adapted to the shape and size of the slide rail, so that the moving element 33 can stably move along the guiding element 34 and accurately position the moving element 33. And further accurately positioning the look-around camera module W.

The light source 40 is disposed on the top plate 60. The top plate 60 is configured to provide stable support for the light source 40. The top plate 60 has a top plate hole 601 adapted to the shape and size of the cylinder 20 such that light emitted by the light source 40 can be incident into the imaging space 200 in a predetermined manner and further by the target plate 50. The reflective strip 51 is reflected.

The bottom plate 70 includes a positioning assembly fixing portion 71 and a bottom plate main body 72, wherein the positioning assembly fixing portion 71 integrally extends from the bottom plate main body 72 toward the center thereof. The bottom plate body 72 of the bottom plate 70 is provided to enable the cylinder 20 to be more stably disposed on the support device 10. The module positioning assembly 30 is disposed on the positioning component fixing portion 71 of the bottom plate 70 such that the module positioning assembly 30 is stably supported at a preset position. More specifically, the guiding element 34 of the module positioning assembly 30 is securely disposed on the bottom plate body 72 of the bottom plate 70.

The arrangement of the positioning unit fixing portion 71 and the arrangement of the module positioning unit 30 enable the ring-shaped camera focusing device to be fixed to the center of the diameter of the cylinder 20 when subjected to the focus test. Its distance from the target 50 is the optical design distance.

According to the first preferred embodiment of the present invention, the slide rail 23 is firmly disposed on the positioning assembly fixing portion 71 of the bottom plate 70.

According to this first preferred embodiment of the invention, the top plate 60 and the bottom plate 70 are integrally provided to the cylinder 20. It should be understood by those skilled in the art that the top plate 60 and the bottom plate 70 may also be tightly and firmly connected to the cylinder 20 without being integrally connected, for example, by welding.

The light blocking assembly 12 includes a series of shingles 121 and a light blocking bottom 122. The panel 121 is disposed around the cylinder body 21 of the cylinder 20. The shroud 121 and the door 22 collectively surround the circumference of the barrel main body 21. The light-shielding bottom 122 is disposed on the bottom side of the bottom plate 70 and thereby closes the bottom of the cylinder 20.

As described above, the door 22 closes the cylinder main body 21 on the side of the cylinder main body 21 to form the cylinder 20. The light source 40 encloses the cylinder 20 at the top of the cylinder 20 and provides light to the imaging space 200. The light-shielding bottom 122 closes the cylinder 20 at the bottom of the cylinder 20 to form a closed imaging space 200.

As shown in FIG. 4A, the light blocking assembly 12 further includes a light blocking top 123 disposed on the top of the bracket 11. It is to be noted that the arrangement of the door 22 and the light-shielding bottom 122 is not only used to close the imaging space 200, but also forms an anti-interference space 100 together with the surrounding plate 121 and the light-shielding top 123. The outside light is prevented from entering the interference prevention space 100. As shown above, the light source 40 is disposed in the interference prevention space 200. The arrangement of the interference prevention space 100 can prevent external light from affecting the uniform illumination of the light source 40.

8A and 8B illustrate the module fixing member 31 of the module positioning assembly 30 of the look-around imaging test apparatus according to the above-described first preferred embodiment of the present invention. As shown in FIG. 8A, the module fixing member 31 has a module fixing groove 301 and an air suction passage 302. The shape and size of the module fixing slot 301 are adapted to the viewing camera module W so that the viewing camera module W can be stably disposed on the module fixing component 31. In order to ensure the flatness of the looking camera module W when the surround camera module W is adjusted, the module fixing component 31 is designed to have an air suction hole. Specifically, the inhalation passage 302 has at least one module connection port 3021 and an intake port 3022. The module connection port 3021 and the intake port 3022 are in communication with each other. When the surround camera module W is fixed, the intake passage 302 of the module fixing member 31 is communicated with a suction device, such as a vacuum generator, to thereby inhale the intake passage 302. Specifically, the air intake port 3022 is inhaled to reduce the air pressure in the air intake passage 302, so that the surround view camera module W is fixed at the module connection port 3021. According to the first preferred embodiment of the present invention, the vacuum generator is connected to a solenoid valve, and the opening and closing of the vacuum generator is controlled by a foot switch, thereby controlling the look-around camera module W and the module fixing component 31. Secure connection and disconnection.

According to the first preferred embodiment of the present invention, the surround camera module W performs focusing using a USB 3.0 focusing tool. The module positioning component 30 is embodied as a USB 3.0 focusing tooling.

As shown in FIGS. 4A and 4B, the support device 10 further includes four support legs 13 which are respectively disposed at four corners of the bottom of the bracket 11. It is worth mentioning that the height of each support member 13 can be adjusted separately, thereby facilitating the adjustment of the stable support of the surround view camera focusing device on its support. The support leg 13 has a rotating wheel to facilitate movement of the surround view focusing device. The rotating wheel of the support member 13 has a locked state and a rotated state, and can be set as needed.

As shown in FIG. 3A and FIG. 3B, the software ROI (test area) will be set at 4 points a, b, c, d, e, f of 4 points of the inner circle and the outer circle of the area M ₂ of the original image. , g, h, so that the test area corresponding to all areas of the corrected image can be simultaneously detected. 3B illustrates an image of an image captured by the surround view camera module after being tested by the test apparatus according to the above-described first preferred embodiment of the present invention, that is, an image of the area M ₂ in FIG. 3A is The corrected image is indicated.

Through the above design of the surround camera focusing device, the image of the surround camera module W for the side annular region can be solved, and the problem of covering each test area is solved in the software. The first preferred embodiment of the present invention solves the problem of the viewing angle test by the first limiting reflective strip 51a and the second limiting reflective strip 51b of the target 50.

According to the above first preferred embodiment of the present invention, a method for testing a surround view camera module is provided to implement testing of a surround view camera module. As shown in FIG. 10, the method for testing the surround view camera module includes the following steps:

A. A measured surround view camera module W is disposed at a center of a diameter of the cylindrical imaging space 200;

B, closing the imaging space 200;

C, the uniform light emitted by the light source 40 reaches the target 50 and then reaches the look-around camera module W;

D. The look-around camera module W performs photoelectric conversion in response to the uniform light reflected by the target, thereby performing original image recording;

E. performing distortion correction on the original image; and

F. Judging whether the resolution and the angle of view of the surround camera module W meet the requirements, thereby determining the quality of the surround camera module.

According to the first preferred embodiment of the present invention, the target 50 is a reflective target. Therefore, the step C is embodied by: the target 50 reflects the uniform light emitted by the light source 40 to the surround camera module W.

According to this first preferred embodiment of the invention, the target 50 comprises a series of reflective strips 51. The step C is embodied by: the reflective strip 51 of the target 50 reflects the uniform light emitted by the light source 40 to the surround camera module W.

According to this first preferred embodiment of the invention, the method of correcting the original image in step E is software detection and correction.

It is worth mentioning that the test method of the surround camera module can be used not only for the test after the focus of the surround camera module, but also for the surround camera module test of other requirements. The invention is not limited in this respect.

Referring to Figures 11 and 12 of the drawings of the present invention, the search for a lens optical center based on a circular imaging region is illustrated in accordance with a second preferred embodiment of the present invention. As shown in FIG. 11 and FIG. 12, the imaging model is 1C, wherein the imaging model is obtained by binarizing a picture taken by the lens, and the imaging model 1C includes an imaging area 10C and an outer image. A region 20C and an inner region 30C, wherein the outer region 20C is located outside the imaging region 10C, and the inner region 30C is located inside the imaging region 10C. It is worth mentioning that the imaging area 10C, the outer area 20C and the inner area 30C are all circular areas.

Further, a portion of the outer region 20C that is connected to the imaging region 10C forms an outer boundary 21C of the imaging region 10C, and a portion of the inner region 30C that is connected to the imaging region 10C forms the imaging region. The inner boundary 31C, in other words, the outer boundary 21C and the inner boundary 31C are respectively located at the outer edge and the inner edge of the imaging region 10C, forming an outer boundary and an inner boundary of the imaging region 10C, such that The imaging region 10C is located at the middle of the outer boundary 21C and the inner boundary 31C. It is worth mentioning that the outer boundary 21C belongs to a part of the outer region 20C, and its gray value is the same as the outer region 20C, and the inner boundary 31C belongs to a part of the inner region 30C, and its gray value is The same as the inner region 30C.

The grayscale value gradient of the outer boundary 21C and the inner boundary 31C and the intermediate image forming region 10C is large, and therefore, the outer boundary 21C and the inner boundary 31C are easily found in the image model 1. And the calculation accuracy is high.

Preferably, in this embodiment, the imaging area 10C is a white area, the outer area 20C is a green area, and the inner area 30C is a black area, that is, the outer boundary 21C is green, and the inner boundary 31C It is black, and the gradation value of the image forming area 10C in the middle is greatly different, and is easily In recognition, in other words, the color of the inner boundary 31C and the color of the outer boundary 21C are different from the color of the imaging region 10C, and it is easy to recognize. Or the imaging area 10C is a white area, the outer area 20C and the outer boundary 21C are black areas, and the inner area 30C and the inner boundary 31C are green areas. Or the imaging area 10C is a white area, and the outer area 20C, the outer boundary 21C, the inner area 30C, and the inner boundary 31C are both green areas or black areas.

It is worth mentioning that the outer boundary 21C and the inner boundary 31C are respectively green and black, by way of example only, and do not limit the invention. The outer boundary 21C and the inner boundary 31C may also be implemented in other colors. As long as the gradation value differs from the imaging region 10C or has a gradation contrast, that is, the present invention makes the gradation value of the outer boundary 21C and the inner boundary 31C and the imaging region 10C The difference in gray value is large to more easily find the inner and outer boundaries of the imaging region 10C in order to find the center of the outer boundary 21C and the inner boundary 31C, thereby bringing the obtained lens optical center closer. Real value, higher accuracy.

In this embodiment, the method of finding the optical center of the lens is as follows:

Step 101C: Binarize the picture to find the coordinates of the point of the inner boundary 31C or the outer boundary 21C of the imaging region 10C in the image.

Step 102C: Fit the inner boundary 31C or the outer boundary 21C into an inner circle or an outer circle, and find the coordinates of the inner circle or the center of the outer circle in the image.

Step 103C: The center of the inner circle or the center of the outer circle is defined as the optical center of the lens.

In the step 101C, the picture is binarized to more clearly highlight the region of interest, and the gray value between the inner boundary 31C, the outer boundary 21C and the imaging region 10C is different. Looking for the coordinates of the point of the inner boundary 31C or the outer boundary 21C in the image, it is more convenient to find the coordinate points, and the coordinates found are more accurate.

In the step 102C, the inner boundary 31C is further fitted to an inner circle according to the point of the inner boundary 31C found in the step 101C, and according to the outer boundary found in the step 101C. At point 21C, the outer boundary 21C is fitted to an outer circle, and the coordinates of the center of the inner circle or the center of the outer circle in the image are obtained using corresponding software and algorithms.

It is worth mentioning that the method of fitting the inner boundary 31C and the outer boundary 21C into a circle can be arbitrarily selected according to actual conditions, that is, the mean value method, the weighted average method or the least square method can be used to fit into the The inner circle and the outer circle are described. In this embodiment, in order to make the fitting effect of the fitted inner circle or the outer circle better, the embodiment uses a least squares method to fit the inner circle and the outer circle.

In the step 103C, according to the actual situation, when there is only one inner circle or one outer circle, the center coordinates of the center circle or the outer circle of the obtained inner circle are the coordinates of the lens optical center, and at least one inner circle at the same time. When at least one outer circle is used, the center of each inner circle and the center of each outer circle can be simultaneously obtained as the optical center of the lens.

This embodiment is to find the optical center of the lens based on the difference in gray value between the inner boundary 31C of black, the outer boundary 21C of green, and the imaging region 10C of white. The operation is simple, the calculation is fast, and the calculation is fast. High precision.

Figure 13 and Figure 14 show a variant implementation of the above second preferred embodiment of the present invention, based on Look like the lens's optical center with a circular area. As shown in FIG. 13 and FIG. 14, on the basis of the above second preferred embodiment, the embodiment is to fit the inner and outer boundaries of an imaging region 10A into a plurality of inner circles or a plurality of outer circles. The center of a plurality of inner circles or a plurality of outer circles, or further finding a plurality of inner circles or/and a center of a plurality of outer circles to more accurately calculate the optical center of the lens.

Specifically, an outer region 20A is formed outside the imaging region 10A, and an inner region 30A is formed inside the imaging region 10A, and the imaging region 10A, the outer region 20A, and the inner region 30A are both Round area. The inner region 10A is a white region, and the outer region 20A includes a plurality of sub-out regions 22A, wherein each of the sub-out regions 22A is an area in which green and black are alternated, and each of the sub-out regions 22A is in phase. The intersecting boundary and the boundary intersecting the imaging region 10A form a plurality of outer boundaries 21A, the inner region 30A also including a plurality of sub-inner regions 32A, wherein each of the sub-inner regions 22A is alternated in green and black. The region, the boundary where the sub-internal regions 22A intersect, and the boundary intersecting the imaging region 10A form a plurality of inner boundaries 31A. Wherein, the outer boundary 21A is distributed around the outer portion of the imaging region 10A, and the inner boundary 31A is distributed around the inner portion of the imaging region 10A by finding the center of the outer boundary 21A and the inner boundary 31A. I was able to find the light center of the lens.

In summary, in this embodiment, the method for finding the optical center of the lens is as follows:

Step 101A: Binarize the picture to find the coordinates of the points of the plurality of inner boundaries 31A or the plurality of outer boundaries 21A of the imaging region 10A in the image.

Step 102A: Fit each of the inner boundary 31A or each of the outer boundaries 21A into a plurality of inner circles or a plurality of outer circles, and determine the center of each inner circle or each outer circle in the image. coordinate of.

Step 103A: The center of each inner circle or the center of each outer circle is defined as the optical center of the lens.

It is worth mentioning that, in the step 103A, when there are multiple inner circles or a plurality of outer circles, the center of each inner circle or the center of each outer circle is obtained simultaneously by using relevant software and an algorithm. Each of the inner circle and the center of each of the outer circles can be used as the optical center of the lens, that is, the inner circle can be used alone to obtain the lens optical center, and the outer circle can be used alone to obtain the lens optical center. You can use both the inner and outer circles to find the lens center of light.

15 and 16 show a third preferred embodiment of the present invention, which illustrates the finding of a lens optical center based on a square or other polygonal shape of the imaging region. As shown in FIG. 15 and FIG. 16, a picture taken by the lens is selected and binarized to obtain an imaging model 1B, wherein the molding model 1B includes an imaging area 10B, an outer area 20B, and an inner area. The area 30B, the imaging area 10B, the outer area 20B, and the inner area 30B are all square. Wherein, the imaging area 10B is located between the outer area 20B and the inner area 30B, in other words, the outer area 20B is located outside the imaging area 10B, and is connected to the imaging area 10B. The region forms an outer boundary 21B, wherein the outer boundary 21B is a portion of the outer region 20B, connected to the imaging region 10B, the inner region 30B is located inside the imaging region 10B, and the imaging The region to which the regions 10B are connected forms an inner boundary 31B, wherein the inner boundary 31B is a part of the inner region 30B, and is connected to the imaging region 10B, and therefore, the outer boundary 21B and the inner boundary 31B are respectively The outer and inner boundaries of the imaging region 10B are formed.

It is worth mentioning that the gray value of the outer region 20B and the inner region 30B and the gray value gradient of the imaging region 10B are larger, that is, the outer region 20B, the inner region 30B and the There is a gray value comparison between the imaging regions 10B, and therefore, the outer boundary 21B and the inner boundary 31B are easily found in the image, and an outer square is obtained by plotting the outer boundary 21B and the inner boundary 31B. And an inner square, looking for the center of the outer square and the inner square to obtain the optical center of the lens.

Preferably, the imaging area 10B is a white area, the outer area 20B and the outer boundary 21B are green areas, and the inner area 30B and the inner boundary 31B are black areas. Or the imaging area 10B is a white area, the outer area 20B and the outer boundary 21B are black areas, and the inner area 30B and the inner boundary 31B are green areas. Alternatively, the imaging region 10B is a white region, and the outer region 20B and the outer boundary 21B are regions in which green and black are alternated, and the inner region 30B and the inner boundary 31B are regions in which green and black are alternated. The imaging area 10B, the outer area 20B, and the inner area 30B may also be other colors having gray scale contrast.

In summary, in this embodiment, the method for finding the optical center of the lens is as follows:

Step 201: Binarize the picture to find the coordinates of the point of the inner boundary 31B or the outer boundary 21B of the imaging region 10B in the image.

Step 202: Fit the inner boundary 31B or the outer boundary 21B to an inner square or an outer square, respectively, and find the coordinates of the center of the inner square or the outer square in the image.

Step 203: The center of the inner square or the center of the outer square is defined as the optical center of the lens.

In the step 202 and the step 203, the inner boundary 31B or the outer boundary 21B is fitted into a corresponding inner square or outer square by corresponding software and algorithms, and the inner square or The center of the outer square is the optical center of the lens.

It is worth mentioning that a plurality of inner boundaries 31B and a plurality of outer boundaries 21B may also be searched for, thereby fitting a plurality of inner squares and a plurality of outer squares, and determining the centers of the plurality of inner squares and the plurality of outer squares, that is, The optical center of the lens, or further the center of multiple inner squares and outer squares, is also the optical center of the lens, and the calculation accuracy is high.

It is worth mentioning that for the search of the lens's optical center with a circular area, it is still possible to fit the inner or outer boundary of the imaged area into a square or other polygon, by calculating squares or polygons or inscribed on each polygon. A circular or circumscribed circle is used to find a lens illumination center whose imaging area is circular.

17 and 18 show a modified embodiment of a third preferred embodiment of the present invention based on the finding of a lens optical center whose imaging area is square or other polygonal. As shown in FIG. 17 and FIG. 18, on the basis of the above-mentioned third preferred embodiment, an inscribed circle 33B is formed on the obtained inner square by corresponding software and an algorithm, and the obtained outer circle is obtained. The square is an circumscribed circle 23B, wherein the inscribed circle 33B coincides with the gradation of the inner region 30B and the inner square, and the circumscribed circle 23B coincides with the gradation of the outer region 20B and the outer square, The optical center of the lens is obtained by calculating the inscribed circle and the center of the circumscribed circle.

In a variant implementation of this embodiment, the method of finding the optical center of the lens is as follows:

Step 201B: Binarize the picture to find the coordinates of the point of the inner boundary 31B or the outer boundary 21B of the imaging region 10B in the image.

Step 202B: Fitting the inner boundary 31B or the outer boundary 21B into an inner square or An outer square, and an inscribed circle 33B of the inner square, or an circumcircle 23B of the outer square.

Step 203B: Find the coordinates of the center of the inscribed circle 33B or the circumscribed circle 23B in the image.

Step 204B: The center of the inscribed circle 33B or the center of the circumscribed circle 23B is defined as the optical center of the lens.

In the step 203B, the coordinates of the center of each of the inner square or the outer square in the image may be further determined, and in the step 204B, the inner square or the outer square is further obtained. The center of the inscribed circle 33B and the center of the circumscribed circle 23B are further integrated to obtain the optical center of the lens.

Preferably, the imaging area 10B is a white area, the outer area 20B and the outer boundary 21B are green areas, and the inner area 30B and the inner boundary 31B are black areas. Or the imaging area 10B is a white area, and the outer area 20B, the outer boundary 21B, and the circumscribed circle 23B are black areas, and the inner area 30B, the inner boundary 31B, and the inscribed circle 33B are Green area. Or the imaging area 10B is a white area, and the outer area 20B, the outer boundary 21B, and the circumscribed circle 23B are alternating areas of green and black, the inner area 30B, the inner boundary 31B, and the The inscribed circle 33B is an area in which green and black alternate. The imaging area 10B, the outer area 20B, and the inner area 30B may also be other colors having gray scale contrast.

More specifically, it is also possible to fit the inner or outer boundary of the square image forming area 10B into other polygons, such as equilateral triangles, diamonds, pentagons, hexagons, trapezoids, and the like, through other polygons. Find the center of the corresponding polygon to find the center of the lens.

Further, in the third preferred embodiment of the present invention, when the imaging region 10B is other polygons, such as a triangle, a diamond, a pentagon, a hexagon, etc., the inner boundary 31B and the outer boundary 21B Still similar to the shape of the imaging region 10B, the obtained lens optical center accuracy is high.

Light is an important factor in determining the imaging effect. The light from the external environment passes through the lens and finally reaches the photosensitive chip to obtain the captured image. Therefore, the performance of the lens is analyzed and usually analyzed by the image taken by the lens.

Shading (shadow, black dot or vignetting) test is one of the items that use image analysis to test the characteristics of the lens. The shading is analyzed by the gray value or brightness value of the test point and the selected reference point. In contrast, the shading values of different test points are then obtained, so for one shot, there is more than one shading value.

The image processing method of the present invention will be described below in conjunction with a shading test process of a lens 1.

To analyze the shading of the lens 1, a test image 100D taken through the lens 1 is first obtained. Therefore, the lens 1 is mounted to an image pickup device 2 such as a camera, whereby an image is captured by the image pickup device 2.

It should be understood by those skilled in the art that the lens 1 is only an example to illustrate the testing process of shading, the form of the lens 1 is not a limitation of the present invention, and the lens 1 may be a lens group, It is a camera module, which can be a camera or other form of camera.

Referring to FIG. 21, in the process of capturing an image by the image pickup device 2, it is necessary to provide a uniform The light source 3, such as a DNP light box, and the process of photographing needs to ensure that the position of the uniform light source 3 is free from interference from other light sources, so that a dark room environment can be provided to reduce the interference of stray light on the shooting process. Further adjusting the parameter value of the camera device 2 to meet the test requirements, such as adjusting the camera related parameters to the best, shooting related parameters to the automatic mode (automatic white balance, automatic exposure), resolution to maximum, and the like.

Further, referring to Fig. 22, in the darkroom environment, the lens 1 carried by the image pickup apparatus 2 is directed toward the light source 3, and an image is taken, thereby obtaining the test image 100D.

After the test image 100D is obtained, the test image 100D is further analyzed by an image processing software.

According to the lens imaging effect, due to the optical characteristics of the lens, the intensity of the light received on the photosensitive chip is different, and the degree of brightness and darkness is different. For example, the brightness of the central area is significantly larger than the surrounding area, so the shading value is used. Characterize this characteristic. In order to calculate the shading value, a reference reference area is selected in the test image 100D, and a test area is selected to obtain the brightness values of the test area and the reference reference area respectively, and then the test area is further The luminance value is compared with the luminance value of the reference reference region, that is, a shading value of the test region is obtained.

As can be seen from the foregoing, referring to FIG. 19, for an ordinary lens, the imaging area of the lens outside the lens is rectangular. For the image mesh division mode of the lens, the image is divided into rectangular grids according to the image structure characteristics. A small rectangle in the central area of the rectangular grid is used as a reference area, and a plurality of small rectangular areas are respectively taken as a test area around the rectangular grid. In this selection method, since the small rectangular shape of the test area is consistent with the overall shape, the boundary condition is easily limited. That is to say, fewer constraints are required, so that the small rectangle can be inside the whole image, and samples at different positions, such as the corner position and the edge position, can be taken, so that the uniformity of the lens imaging can be comprehensively reflected. . Referring to Figures 20B and 2C, the rectangular meshing method is obviously not applicable when the image outside of the lens is not rectangular, but circular or other shape.

Referring to FIG. 22, from the structural feature of lens imaging, the test image 100D is circularly center-symmetrical, and due to the symmetry of the lens, the test image 100D of the lens is radially outward from the center. Gradient effect. That is to say, at the position of the equal radius, the brightness is relatively uniform, and in the direction of the radiation, the brightness is gradually changed or changed significantly. Generally speaking, the center of the image receives the most light energy and the highest brightness. Generally, the position is selected as the reference reference area, and the peripheral area receives less light energy and less brightness, and generally selects the position as the test area. In particular, the closer to the edge region, the smaller the brightness, as the selected location of the test area. In particular, during the shading test, if the area close to the edge area can be selected as the position of the test area, then one end value of the shading can be obtained, that is, the shading of the inner area (shading) The test value will be in this range.

Correspondingly, if the value close to the circular edge region is selected to conform to the specification, then it can be roughly judged that other internal locations conform to the specification; and if the region near the circular edge does not conform to the specification value, then other test regions can be selected, so Based on the selection of the least points, the sampling range is the widest.

The problem here is that the division of the rectangular grid in the existing test mode is not applicable due to the change of the circular arc edge. When the mesh is internally divided, it is not easy to get close to the edge of the circle, that is, the points of most of the edge regions in the image are lost, so the resulting shading value is not accurate; Including the entire image, such as making the circular image inscribed in a rectangular grid, then a large area of extra area appears in the corner of the rectangle, the non-test image part, the addition of these parts seriously affects the correctness of the shading value, Therefore, the boundary conditions are further added to remove these extra regions from the original rectangular grid. Obviously, such an operation process greatly increases the amount of calculation of the image processing process, making the calculation more complicated.

Referring to FIG. 23 to FIG. 24D, according to a fourth preferred embodiment of the present invention, a calculation area selection layout for calculating a shading of a lens is provided, which is applied to a circular test image 100D including at least one reference region 10D and At least one test area 20D, wherein the reference area 10D is circular, located in a central area of the test image 100D, and the test area 20D is circular and located in a predetermined test position within the test image 100D.

It is worth mentioning that the reference area 10D and the test area 20D are selected as calculation areas for calculating lens shading, and the rectangular calculation area in the prior art is converted into a circular calculation area. And because the shape of the circular reference region 101D is consistent with the shape of the test image 100D, the circular reference region 10D may be close to an edge region of the test image 100D, such as the test region 10 The test image 100D is circular, so that the edge region of the test image 100D can be acquired as the test region 20D without requiring a defined complex boundary condition, so that the test image can be more comprehensively and accurately calculated. 100D shading value.

Therefore, the brightness value of the circular test area 20D is acquired, and the brightness value of the circular reference area 10D is acquired, and the brightness value of the test area 20D is compared with the reference area 10D, and then the test is obtained. The shading value of the area 20D. It is worth mentioning that the obtained reference area 10D and the test area 20D both have a certain area area, so that the obtained brightness is more than one, and in the process of calculating shading, it can be selected according to different situations. For example, the maximum brightness of each of the reference area 10D and the test area 20D is selected as a calculation use value, thereby calculating a shading value.

According to the characteristics of the lens imaging, the reference zone 10D is generally selected from the center position of the test image 100D, and for convenience of determining the position of the reference zone 10D, according to a fourth preferred embodiment of the present invention, referring to FIG. 24B, The reference area 10D and the test image 100D have the same center. That is, the reference area 10D and the test image 100D are concentric circles.

It should be understood by those skilled in the art that the position of the reference region 10D can be selected according to requirements, not limited to a position concentric with the test image 100D, or may be within a region close to the center point of the test image 100D. One circle or several circles, the position and number of the reference zone 10D0 are not limited by the present invention.

Since the center position of the reference region 10D and the test region 20D affects the sampling range, the size of the circular area of the reference region 10D and the test region 20D affects the number of sampling points, and thus the reference region 10D and the test The selection of the center of the 20D circle and the radius is selected according to requirements. According to a fourth preferred embodiment of the present invention, referring to FIG. 24C, the reference area 10D and the test area 20D have the same radius, that is, the reference area 10D and the test area 20D have the same area. The number of sampling points is approximately the same.

Further, according to the feature of the test image 100D, the brightness is changed from the center outward, and the brightness is the darkest in the edge area, so the test area 20D for calculating shading is not limited to one. Another In the aspect, in order to more comprehensively evaluate the uniformity of the test image 100D, the test area 20D is selected in different regions of the test image 100D. According to a fourth preferred embodiment of the present invention, the test image 100D includes a plurality of the circular test zones 20D symmetrically distributed around the reference zone 10D so that a plurality of the similar gradients can be obtained. The zone 20D is tested to evaluate the uniformity of the image of the test image 100D in the same gradient.

In order to compare the uniformity variations of the test images 100D in different regions and different gradients, the test zones 20D distributed in different gradients may be selected. According to a fourth preferred embodiment of the present invention, the plurality of test zones 20D are divided into a plurality of gradient sections 201D, and the distances of the test zones 20D of the same gradient section 201D from the reference zone 10D are the same, different. The distance of the gradient portion 201D from the test area 20D is different. Therefore, the shading value of the test area 20D by the different gradient portions 201D can be acquired, thereby evaluating the gradient change of the uniformity of the test image 100D, that is, the different distance from the reference region 10D. The degree of change in brightness of the test area 20D.

Further, the center of the test area 20D of the gradient portion 201D is located on a gradient ring 202D that is concentric with the test image 100D. In other words, the test zone 20D of the same gradient portion 201D is centered on a point on the gradient ring 202D.

It should be understood by those skilled in the art that the gradient ring 202D is only used as a reference for position to facilitate determining the center of the test zone 20D of the same gradient portion 201D, which may be at a distance from the reference zone 10D as required. The position and number of the gradient ring 202D selected by different distances are not limited by the present invention.

It should also be understood by those skilled in the art that the position and number of the test area 20D affect the obtained shading value, and the plurality of the test areas 20D are respectively distributed in different gradient sections 201D in the figure. The same gradient portion 201D distributes a plurality of the test regions 20D, and the corresponding distribution of the test regions 20D of the different gradient portions 201D is taken as an example, but the distribution of the test regions 20D is not limited to the above.

Thereby, the brightness values of the different test areas 20D and the reference area 10D are respectively obtained, and the shading values of the different test areas 20D can be obtained.

It is worth mentioning that, when calculating the shading value, on the one hand, since the image is composed of pixels, each pixel has its own brightness value, so the characteristics of a single point cannot represent the overall property, so Selecting the reference area 10D and the test area 20D having a predetermined area, the brightness values respectively representing the reference area 10D and the test area 20D may be selected by different criteria, such as selecting the point with the largest brightness value from the area. The luminance value represents the luminance value of the entire region, or the average value of the luminance in the region is calculated as the luminance value of the entire region. On the other hand, due to the symmetrical structural design of the lens, the image has a gradual change in the whole. In order to more comprehensively evaluate the uniformity of the lens imaging, the reference region 10D is selected at the central feature position or multiple sub-selections are selected in the central region. a reference area, wherein a region having the highest brightness is selected from the plurality of the sub-reference regions as the reference region 10D for calculation, and a plurality of the test regions 20D are regularly selected in a region outside the reference region 10D, thereby You can calculate the shading value for different location areas.

According to the above fourth preferred embodiment of the present invention, an image processing method for shading is provided The method, referring to FIG. 22 to FIG. 25, is suitable for analyzing an image in which the imaging area on the photosensitive chip outside the lens is circular. The rectangular mesh is transformed into a radial circular network, so that the shape of the test area is consistent with the overall edge of the test image, so that the test area does not exceed the range of the test image while acquiring the peripheral area of the test image.

More specifically, the method for selecting a calculation area of the lens shading includes the following steps:

(A) obtaining a central coordinate O ₁ (x, y) of a circular test image 100D and a radius R;

(B) taking the test image 100D as a center O ₁ (x1, y1) as a center, taking r as a radius, taking a circular reference region 10D;

(C) In the test image 100D, outside the reference area, a circular test area 20D having a radius r is taken.

In the step (B), a reference datum for calculating a shading is selected, that is, a region having a larger brightness in the test image 100D is selected as a reference region, thereby facilitating calculation of shading, and evaluation The brightness uniformity of the test image is described. The size of the reference area 10D affects the number of sampling points. On the other hand, in the step (C), in order for the sampling amount of the test zone 20D to coincide with the sampling amount of the reference zone 10D, the radius of the test zone 20D and the reference zone 10D are identical, and The selected circular reference area 10D needs to be entirely located in the test image 100D, so the position of the test area is limited here so that the test area 20D is obtained while the edge area of the test image 100D can be acquired. Located within the test image 100D. According to the above method of the present invention, in the step (B), the radius of the reference region 10D is determined with reference to the pixels of the radial direction of the test image 100D. For example, but not limited to, 5% of the diametrical pixels of the test image 100D are referenced. Here, the size of the selected reference area 10D may be determined according to an actual image.

After the radius of the test reference zone 10D is determined, since the radius of the test zone 20D and the reference zone 10D are the same, it is necessary to make the test 20 be located by defining the center position of the test zone 20D. Test the image inside. If the center coordinate of the test area is O ₂ (x2, y2), the circular coordinates only need to satisfy the condition.

It is thus possible to have the test zone 20D located within the test image 100D.

It can be seen that since the test area 20D and the test image 100D have the same shape and are circular, in the case where the radius r is smaller than the radius R of the test image 100D, it is only necessary to simply define the radius. With the coordinate position of the circle, the adoption points of different positions of the test image can be acquired, and all the sampling points are located in the test image 100D, and the calculation amount is reduced with respect to the rectangular grid, and the calculation efficiency is improved.

Further, in order to acquire the plurality of test areas 20D of the same gradient portion 201D, it is necessary to separately determine the center positions of the plurality of test areas 20D, and only need to determine the center O ₂ (x2 of any one of the test areas 20D). Y2), taking the center point O ₁ (x1, y1) of the test image 100D as a center and taking the distance O ₁ O ₂ between the two centers as a radius, taking the gradient ring 202D, so the step (C) The method includes the steps of: determining a center coordinate O ₂ (x2, y2) of any of the test areas 20D, taking the center O ₁ (x1, y1) of the test image 100D as a center and taking a radius of O ₁ O ₂ as a radius The gradient ring 202D determines the center of the center of all of the test zones 20D within the same gradient portion 201D.

After determining the position of the test area 20D, the test area 20D may be selected, and at different positions on the gradient ring 202D, at different positions symmetrical with the reference area 10D, a circle having a radius r may be taken. Then, the same gradient portion 201D and a plurality of the test regions 20D in different regions are obtained. Therefore, the step (C) further comprises the step of taking a circle having a radius r at different positions on the gradient ring 202D with respect to different positions symmetrical about the reference region 10D.

In order to more comprehensively evaluate the shading of the test image, it is also necessary to acquire the test area 20D different from the gradient portion 201D, and the positions of the test areas 20D different from the gradient portion 201D correspond to each other, and may be more The brightness of the image in the radial direction of the test image 100D is clearly evaluated. That is, the test area 20D is taken at a different position in the radial extension direction of the test image 100D. Therefore, the step (C) further comprises the steps of taking a plurality of the gradient rings 202 of different radii, respectively taking the test zone 20D at corresponding positions on different gradient rings 202.

After obtaining the reference region 10D and the test region 20D, respectively acquiring the luminance value I1 of the reference region 10D and the luminance value I2 of the test region 20D, and comparing the luminance value I2 of the test region 20D with the Comparing the luminance value I1 of the reference region 10D, the shading value of the test region 20D is obtained, that is,

Shading = (I1/I2) × 100%

Therefore, the method includes the step (D) of acquiring the respective brightness values of the test area and the reference area, thereby obtaining a lens shading value, that is, a shading value.

It is worth mentioning that, when calculating the shading value, on the one hand, since the image is composed of pixels, each pixel has its own brightness value, and the characteristics of the single point cannot represent the overall property, so The reference area 10D and the test area 20D having a predetermined area may select brightness values respectively representing the reference area 10D and the test area 20D by different criteria, for example, selecting a point having the largest brightness value from the area The brightness value represents the brightness value of the entire area, or the average value of the brightness in the area is calculated as the brightness value of the entire area. In addition, the selection of the reference region 10D is not limited to one, and may be plural. For example, a plurality of the reference regions 10D are symmetrically distributed in a central region of the test image 100D, the reference region 10D and the test zone. The distribution and number of 20Ds are not a limitation of the present invention. In the calculation, one of the reference regions 10D is selected for subsequent shading calculation operations.

FIG. 26 shows an imaging principle according to a fifth preferred embodiment of the present invention. Unlike the prior art camera module, the surround camera module includes a concentrator 10E and an optical sensor 20E. The optical sensor 20E Reflected light that is configured to sense an imaged object that is concentrated by the concentrator 10E, wherein the concentrator 10E is configured to converge the wide range of viewing angles of the concentrator 10E, even a 360 degree viewing angle range The reflected light within the imaged object is such that it can be sensed by a single of said optical sensors 20E.

The concentrator 10E forms a condensing optical path 101E, wherein the concentrator 10E is provided to condense the reflected light of the imaging object to the condensing optical path 101E. Preferably, the optical sensor 20E is disposed at the light collecting path 101E, so that the optical sensor 20E can be sensed by the concentrator 10E The reflected light that is concentrated on the image forming object of the collecting light path 101E.

The concentrator 10E has a first reflecting surface 11E and a second reflecting surface 12E, wherein the first reflecting surface 11E and the second reflecting surface 12E are disposed face to face. The first reflective surface 11E and the second reflective surface 12E form a first reflected light path 13E and a second reflected light path 14E, wherein the first reflected light path 13E is formed on the first reflective surface 11E and the Between the second reflecting surfaces 12E, the second reflecting light path 14E is formed inside the first reflecting light path 13E, wherein the first reflecting surface 11E is capable of reflecting the reflected light of the image forming object into the first reflecting light path 13E, the reflected light of the imaged object can be reflected again by the second reflecting surface 12E and into the second reflected light path 14E.

Since the second reflected light path 14E is formed inside the first reflected light path 13E, the second reflected light path 14E can condense the reflected light of the imaged object reflected by the first reflective surface 11E. That is, the second reflected light path 14E forms the light collecting light path 101E, so that the concentrator 10E of the surround view camera module can be concentrated within a wide angle of view of the concentrator 10E. Even the reflected light of the imaged object within a 360 degree angular range, so that the reflected light of all the imaged objects within the wide angle of view of the concentrator 10E can be set to a single of the second reflected light path 14E The optical sensor 20E senses. Therefore, the second reflected light path 14E forms the collected light path 101E, and the reflected light having an appropriate incident angle of the imaged object is selectively reflected by the first reflective surface 11E and enters the first reflected light path 13E. It is reflected again by the second reflecting surface 12E, thereby being concentrated and entering the second reflected light path 14E. In addition, since the convergence of the reflected light of the image forming object by the concentrator 10E of the look-around camera module is synchronous and real-time, the concentrator 10E can converge at a large position of the concentrator 10E. The reflected light of the imaged object within the angular viewing angle causes the reflected light of all the imaged objects within the wide angle of view of the concentrator 10E to be synchronously induced by the single optical sensor 20E.

It can be understood by those skilled in the art that, unlike the rectangular imaging area of the prior art camera module, the imaging area 30E of the surround view camera module is annular, as shown in FIG. The inner and outer portions of the annular image forming area 30E are dark areas, which may also be referred to as non-image areas. Therefore, when testing the white balance of the surround view camera module, the test area 40E must be limited to The accuracy of the test results can be ensured in the imaging area 30E of the surround view camera module.

It can be understood that the center of the imaging area 30E of the surround view camera module is located in the dark area of the image forming area 30E. If the white balance test method of the prior art camera module is used, The center of the imaging area 30E is a centrally cut rectangular test area, and at least a part of the test area is a non-imaged area. At this time, the white balance of the surround view camera module cannot be tested by calculating the pixel value of the test area, that is, The white balance test method using the prior art camera module may result in inaccuracy of the white balance test result of the surround view camera module.

Therefore, based on the imaging principle of the surround view camera module, the present invention provides a white balance test method 400 for a surround view camera module. As shown in FIG. 29, the testing process of the testing method 400 includes the following steps:

Step 401: Capture an image by using the look-around camera module. For example, in a specific example of the fifth preferred embodiment of the present invention, the surround view camera module to be tested may be placed in a test device. And a test plate with a test pattern is provided inside the test device, wherein the image is obtained by using the look-around camera module to shoot against the test plate. It can be understood that the manner in which the surround view camera module is placed inside the test device to capture the image is merely an illustrative example, that is, the look-around camera module captures the image. The method can be unlimited.

Step 402: Obtain the imaging area 30E of the look-around camera module according to the data of the image. As shown in FIG. 27, the imaging area 30E of the look-around camera module is annular, and the inside or outside of the imaging area 30E is an unimaged area, wherein the white area in FIG. 27 represents the imaging area. 30E, the black area represents the non-image area. Since the image is acquired by the surround view camera module by means of instant shooting, the test method has real-time performance when testing the white balance of the surround view camera module, thereby improving the test. The method measures the efficiency and accuracy of the white balance of the surround view camera module.

Step 403, determining a center of the imaging area 30E according to an inner diameter or an outer diameter of the imaging area 30E of the look-around camera module. It will be understood by those skilled in the art that after the imaging area 30E of the surround view camera module is determined, the imaging area can be derived from any of the inner or outer diameters of the imaging area 30E. The center of 30E.

Step 404, centering on the center of the imaging area 30E, defining the annular test area 40E in the imaging area 30E, as shown in FIG. 28, wherein the gray area represents the test area 40E. That is, the center of the imaging area 30E of the surround view camera module coincides with the center of the test area 40E. The size of the test area 40E needs to be moderate, so as to ensure the test accuracy of the surround view camera module and ensure the test efficiency of the look-around camera module. When determining the test area 40E, as shown in FIG. 28, the inner diameter radius parameter of the test area 40E is R1, the outer diameter radius parameter of the test area 40E is R2, and the inner diameter radius parameter of the imaging area 30E is R3. The outer diameter radius parameter of the imaging region 30E is R4, such that the sum of the inner diameter radius R1 and the outer diameter radius R2 of the test region 40E is equal to the sum of the inner diameter radius R3 and the outer diameter radius R4 of the imaging region 30E, In this manner, the size of the test area 40E defined within the imaging area 30E is relatively modest.

Step 405: Test the white balance of the look-around camera module by calculating the pixel value of the test area 40E.

As shown in FIG. 30, a white balance test method 500 for a surround view camera module of the present invention capable of achieving the foregoing object, wherein the test method 500 includes the following steps:

Step 501, (a) defining an annular test area 40E in the imaging area 30E centering on the center of the annular imaging area 30E of the surround view camera module;

Step 502, (b) testing the white balance of the look-around camera module by calculating the pixel values in the test area 40E.

Further, before the step (a), the method further comprises the steps of:

(c) determining the center of the imaging area 30E of the surround view camera module in real time.

Further, before the step (c), the method further comprises the steps of:

(d) determining the imaging area 30E of the surround view camera module in real time.

Further, in the step (d), the method further comprises the steps of:

(d.1) capturing an image using the camera module; and

(d.2) determining the imaging area 30E of the surround view camera module based on the data of the image.

Further, in the step (a), the method further comprises the steps of:

(a.1) defining a position of the test area 40E within the imaging area 30E centering on a center of the imaging area 30E; and

(a.2) Determine the size of the test area 40E.

Further, in the step (a.2), the sum of the inner diameter radius and the outer diameter radius of the test area 40E is equal to the sum of the inner diameter radius and the outer diameter radius of the imaging area 30E.

In addition, the present invention further provides a white balance automatic adjustment method for a surround view camera module, wherein the adjustment method includes the following steps: automatically adjusting according to a white balance test result of the surround view camera module obtained by the test method The white balance of the camera module is viewed.

As an illustrative illustration, the adjustment method includes the following steps:

(A) centering on the center of the annular imaging area 30E of the surround view camera module, defining an annular test area 40E in the imaging area 30E;

(B) testing the white balance of the surround view camera module by calculating the pixel values in the test area 40E;

(C) automatically and in real time adjusting the white balance of the surround view camera module based on the test result of the white balance of the surround view camera module.

It can be understood by those skilled in the art that since the white balance test of the surround view camera module is based on real-time, the adjustment method also adjusts the white balance of the surround view camera module. In real time, in this way, the imaging quality of the surround view camera module can be effectively improved.

Wide-angle or related camera modules such as ultra wide-angle modules, fisheye modules, and 360° panoramic modules are new types of camera modules that have been developed in recent years. They can expand the range of viewing angles and show that non-wide-angle displays are not displayed. The larger the wide angle, the closer to the actual field of view of the person. For example, the 360° panoramic module, the picture taken by the panoramic module is like a week-long effect in the environment. The wide-angle camera module brings better visual impact to people, and is suitable for some special environments. It has many advantages and has good development prospects. However, the production of a product, the corresponding manufacturing and testing technology also needs to be improved accordingly. For example, when using the traditional integrating sphere for detection, dark edges and other phenomena appear, indicating that the traditional integrating sphere can not meet the requirements of existing products. . According to a preferred implementation of the present invention, a wide-angle integrating sphere is provided for providing a uniform shooting light source, and is particularly suitable for a wide-angle camera module, and can provide a wide-angle uniform light source of a wide-angle camera module, thereby facilitating detection of a wide-angle camera module. . It is worth mentioning that the wide-angle camera module of the present invention is suitable for testing of a wide-angle camera module, and provides a wide-angle uniform light source for the wide-angle camera module, but the wide-angle camera module can also be used for detecting an ordinary camera mode. group.

Referring to Figures 32 to 35 of the accompanying drawings, a wide-angle integrating sphere according to a sixth preferred embodiment of the present invention is illustrated. The wide-angle integrating sphere includes an outer ball 10F, an inner ball 20F, a blocking member 30F and a light source 40F.

The outer ball 10F has an inner space 11F and a light source inlet 12F. The inner ball 20F is disposed in the inner space 11F of the outer ball 10F, and the light source 40F is disposed on the outer ball 10F. The inlet 12F of the light source 40F is positioned such that light is incident into the inner space 11F of the outer ball 10F through the inlet 12F of the light source 40F.

In this embodiment of the invention, the light source 40F is mounted to the light source inlet 12F of the outer ball 10F and is fixedly coupled to the outer ball 10F. That is, the light source 40F is a fixed member of the wide-angle integrating sphere.

In still other embodiments of the present invention, the light source 40F may be provided separately, combining the light source 40F with the outer ball 10F to provide the base light source 40F for the wide-angle integrating sphere. That is, a separate light source 40F is combined with the wide-angle integrating sphere of the present invention, so that a test operation can be performed, where the light source 40F is not a fixed component of the wide-angle integrating sphere, and those skilled in the art It should be understood that the arrangement or separate provision of the light source 40F is not a limitation of the present invention. In particular, the light source 40F is a high brightness light source to provide sufficient reflected light intensity.

Further, the light source 40F is an LED light source, and may be a high power LED light group. In this embodiment of the present invention, the light source 40F can be communicably connected to a controller 41F, and the color temperature, brightness and the like of the light source 40F can be controlled by the controller 41F, so that different light conditions can be provided. The wide-angle integrating sphere can meet the shooting and testing requirements of different types of camera modules or cameras. The light source 40F may be communicably connected to the controller 41F in a wired or wireless manner. It will be understood by those skilled in the art that the manner in which the light source 40F is coupled to the controller 41F and the location in which the controller 41F is disposed is not a limitation of the present invention.

The stopper 30F is disposed at the inner space 11F of the outer ball 10F and at a position opposite to an incident direction of the light source 40F, thereby blocking the direct entry into the outer ball 10F through the light source inlet 12F. Light within the inner space 11F.

According to this embodiment of the invention, the blocking member 30F is a curved surface structure to block the incoming direct light more widely, and the convex side of the curved surface structure is opposite to the light source inlet 12F, the curved surface The concave side of the structure is opposite the inner ball 20F. In particular, the stop 30F is a spherical structure. And the outer spherical surface is opposed to the light incident direction of the light source 40F, and the inner spherical surface is opposed to the inner ball 20F. The shielding member 30F has a plating layer on both sides to better diffusely reflect light. More specifically, the plating on both sides of the stopper 30F is the same as the plating on the inner wall of the outer ball 10F of the outer ball 10F.

In other embodiments of the present invention, the blocking member 30F may be other structures, such as a plate-like structure, or may be a conventional reflective plate, but is limited to a geometric structure and a light reflecting effect, and is preferably a spherical curved surface structure. It will be understood by those skilled in the art that the specific structure and shape of the stopper 30F is not a limitation of the present invention.

The outer ball 10F has an outer ball inner wall having a plating layer on the outer ball inner wall 13F so as to be uniformly diffused and reflected when the light reaches the outer ball inner wall 13F of the outer ball 10F. More specifically, the plating layer is a Baso ₄ plating layer in order to ensure the diffuse reflectance of the inner wall of the outer ball 10F of the outer ball 10F.

It is worth mentioning that the outer ball 10F is an opaque ball, so that external light can be isolated to prevent external stray light from entering the inner space 11F of the inner ball 20F, thereby providing the inner ball 20F with a closed. Inside surroundings.

Further, the stopper 30F is located between the inner ball 20F and the light source inlet 12F so as to block light entering from the light source inlet 12F of the outer ball 10F from directly reaching the inner ball 20F. That is, the light emitted by the light source 40F enters the inner space 11F of the outer ball 10F through the light source inlet 12F of the outer ball 10F, and is projected to the stopper 30F by the stopper. 30F diffusely reflects and is reflected onto the outer ball inner wall 13F of the outer ball 10F, and the light reaches the inner ball 20F after being repeatedly diffused and reflected by the stopper 30F and the outer ball 10F. The inner ball 20F is uniformly projected by the light source 40F. The stopper 30F is combined with the inner ball 20F to provide a photographing detection condition such that the light received by the inner ball 20F is diffusely reflected. That is, the light received by the inner ball 20F is the reflected light of the inner wall of the outer ball 10F of the outer ball 10F and the light reflected by the inner side of the stopper 30F.

The inner ball 20F has an inner ball outer wall 21F and an inner ball inner wall 22F. The inner ball outer wall 21F and the inner ball outer wall 22 each have a plating layer, so that the inner ball 20F becomes a semi-transmissive sphere. And the light transmitted through the inner ball 20F is uniform. According to this embodiment of the invention, the plating layer is a Baso ₄ plating layer, thereby ensuring the uniformity of the transmitted light of the inner ball 20F, and having a good uniform light transmission and diffuse reflection effect. More specifically, during the manufacturing process, the inner ball 20F can be manufactured by translucency using a high precision 3D printer.

In accordance with this embodiment of the invention, the outer ball 10F is preferably a spherical structure to provide more uniform light through a centrally symmetrical structure, while in other embodiments of the invention, the outer ball 10F may have other shapes, such as Ellipsoids, squares, polyhedrons, etc., it will be understood by those skilled in the art that the shape of the outer sphere 10F is not a limitation of the present invention.

The outer ball 10F has a window 14F, and the inner ball 20F has a detecting port 23F opposite to the detecting port 23F, so that the product can be detected through the window 14F of the outer ball 10F. For example, a wide-angle camera module is placed in the detection port 23F. According to this embodiment of the invention, the center of the light source 40F, the center of the window 14F of the outer ball 10F, the geometric center of the stopper 30F, the center of the detecting port 23F of the inner ball 20F, and the The center of the inner ball 20F is located on the same straight line, so that the stopper 30F better blocks the direct light of the inner ball 20F and makes the light received by the inner ball 20F more uniform.

It is worth mentioning that in the conventional detection mode, the detection product is directly placed in the sphere, and when detecting, the detection product, such as a camera module or a camera, is photographed with the reflector 30P as an object. The reflector 30P reflects the reflected light of the inner wall of the sphere, and the reflected light is captured by the detection product, such as being captured by the camera module or added to obtain detected image information. In this case, the reflecting plate 30P is taken as a subject and reflects relatively uniform light, so that the detecting condition of the uniform light source 40F can be provided for the detecting product. However, when the detection product is a wide-angle camera module or a camera, it is required to take a larger angle object, and the reflector provides only a planar object, so that a dark edge appears in the edge region in the captured image, that is, It is not possible to detect wide-angle camera modules or cameras. In the present invention, the detection product is placed in the inner ball 20F, and the inner ball 20F is a uniform light-transmitting ball. During the detection, the inner ball inner wall 22F of the inner ball 20F is Subject and provided a uniform reflected light source, so as to provide a spherical uniform light source object for detecting the object, such as the wide-angle camera module or the wide-angle camera, when the detection object, such as the wide-angle camera module or the wide-angle camera, is performed When shooting, the entire three-dimensional space can be used as a subject, so that it can fully satisfy the shooting requirements of wide-angle modules, fisheye modules, 360° panoramic modules, and other wide-angle or related camera modules or cameras. Position, the wide-angle module such as the super wide-angle module, the fisheye module, the 360° panoramic module, or a related camera module or camera can capture the subject of the uniform light source 40F. In particular, the inner ball 20F can provide a 360° uniform light source that accommodates the captured image requirements of the 360° panoramic module. The inner ball 20F serves as a uniform light source 40F on the one hand, and diffusely reflected light passes through the inner ball 20F, enters the inner ball 20F, and diffuses reflection on the inner ball inner wall 22F of the inner ball 20F. The light in the inner ball 20F undergoes multiple attenuation, multiple transmission, and diffuse reflection, so that the light is more uniform and can provide better shooting conditions; on the other hand, the detection product is placed in the inner ball 20F The inner ball inner wall 22F of the inner ball 20F serves as a subject and is a spherical object, thereby providing a wide-angle uniform light source condition, thereby avoiding the super wide-angle module, the fisheye module, and the 360° panoramic mode. Groups such as wide-angle or related camera modules or cameras appear dark edges during the detection of shooting. And the blocking member 30F is combined with the inner ball 20F such that the direct light of the light source 40F does not directly reach the inner ball 20F.

Specifically, in this embodiment of the invention, the inner ball 20F is fixed inside the outer ball 10F, and the window 14F and the inner ball 20F of the outer ball 10F of the outer ball 10F are made The detection ports 23F are in communication with each other. More specifically, in an embodiment, the detecting port 23F of the inner ball 20F is formed with an extended duct, so that the inner ball 20F and the outer ball 10F are fixedly connected to each other through the extending duct. And the window 14F of the outer ball 10F is in communication with the extension duct. That is, the extension duct provides the inner ball 20F with a position fixed to the outer ball 10F. For example, the inner ball 20F may be coupled to the outer ball 10F by screwing or welding or the like. Specifically, in this embodiment of the invention, the inner ball 20F is coupled to the outer ball 10F by screwing. That is, a thread is provided on the outer wall of the extending duct of the inner ball 20F, and a reverse thread is provided on the inner wall of the window 14F of the outer ball 10F, so that the outer ball 10F and the inner ball 20F are screwed. Pick up. In another embodiment of the present invention, the inner ball 20F may be coupled to the outer ball 10F by direct embedding, that is, the extension pipe of the inner ball 20F is inserted into the outer ball. The window 14F of the ball 10F is such that the inner ball 20F is stably fixed to the outer ball 10F. In another embodiment of the present invention, the inner ball 20F may be connected to the outer ball 10F by integral connection, such as by means of 3D printing, after printing the inner ball 20F, continue to print the outer ball. The ball 10F and the inner ball 20F are fixedly coupled to the outer ball 10F. It will be understood by those skilled in the art that the manner in which the inner ball 20F and the outer ball 10F are connected is not a limitation of the present invention.

It is worth mentioning that the inner ball 20F is suspended in the outer ball 10F, so that different positions and different directions of the inner ball 20F can receive the light reflected by the inner wall of the outer ball 10F. And the light is even. That is, the inner ball 20F is fixed to the outer ball 10F through the extension duct, and is not in contact with the outer ball inner wall 13F of the outer ball 10F at the remaining position.

In particular, in this implementation of the invention, the diameters of the outer ball 10F and the inner ball 20F are collinear such that the inner ball 20F is located in a relatively intermediate position within the inner space 11F of the outer ball 10F. And The light is distributed symmetrically so that the light received by the upper and lower sides of the inner ball 20F is uniform, and the uniformity of the light inside the inner ball 20F is ensured.

The wide-angle integrating sphere includes a bracket 50F to which the outer ball 10F is mounted, so that the outer ball 10F can be stably supported.

The bracket 50F includes a bracket main body 51F and a set of traveling wheels 52F, the set of traveling wheels 52F are mounted to the bracket main body 51F, and the outer ball 10F is mounted to the bracket main body 51F, thereby causing the The wide-angle integrating sphere can move freely. More specifically, the traveling wheel 52F has a walking state and a fixed state, and the wide-angle integrating sphere is freely movable when the traveling wheel 52F is in the walking state, when the traveling wheel 52F is in the fixed state In the state, the wide-angle integrating sphere is stably stopped at a fixed position, and a stable position at which detection can be performed. In particular, in this embodiment of the invention, the bracket 50F includes four of the traveling wheels 52F symmetrically distributed to stably support the walking of the wide-angle integrating sphere.

According to this embodiment of the invention, the outer ball 10F includes two hemispheres, a first outer hemisphere 15F and a second outer hemisphere 16F, respectively, and the second outer hemisphere 16F is detachably connected to the first outer ball. The hemisphere 15F facilitates the mounting of the stopper 30F and the inner ball 20F.

More specifically, the first outer hemisphere 15F is mounted to the bracket 50F, the inlet 12F of the light source 40F is disposed to the first outer hemisphere 15F, and the light source 40F is mounted to the first outer hemisphere The light source inlet 12F of 15F corresponds to a position and is located outside the first outer hemisphere 15F. The stopper 30F is mounted to the inner side of the first outer hemisphere 15F through a mounting bracket 31F, and the outer curved surface of the blocking member 30F is opposite to the first outer hemisphere 15F. The window 14F is disposed in the second outer hemisphere 16F, and the inner ball 20F is mounted on the inner side of the second outer hemisphere 16F, and corresponds to the window 14F of the second outer hemisphere 16F. . In this embodiment of the invention, the second hemisphere is connected to the first hemisphere by screwing, that is, at the interface position of the first outer hemisphere 15F and the second outer hemisphere 16F. Cooperating threaded structures are respectively provided such that the second outer hemisphere 16F is threadedly coupled to the first outer hemisphere 15F. Of course, in other embodiments of the present invention, the second outer hemisphere 16F may be connected to the first outer hemisphere 15F by other means, such as plugging, magnetic connection, fixed component connection, etc., those skilled in the art. It should be understood that the manner in which the second outer hemisphere 16F and the first outer hemisphere 15F are connected is not a limitation of the present invention.

It is worth mentioning that, in this embodiment of the invention, the first outer hemisphere 15F and the second outer hemisphere 16F are symmetrical two hemispheres, that is, the outer sphere 10F is equally divided into two. In other embodiments of the present invention, the first outer hemisphere 15F and the second outer hemisphere 16F may be unequal hemispheres, that is, the outer balls 10F are not equally divided to form a The spherical structure, it will be understood by those skilled in the art that the size of the first outer hemisphere 15F and the second outer hemisphere 16F is not a limitation of the present invention. In another embodiment of the invention, the outer ball 10F may be a unitary structure.

It is worth mentioning that the conventional analog wide-angle integrating sphere usually includes a plurality of combined light sources and a plurality of reflectors, the structure is complicated, and the detected product is easy to generate shadows, and the detection effect is poor, and the sixth preferred according to the present invention. In the embodiment, by the combination of the inner ball 20F and the outer ball 10F and the stopper 30F, the requirement of a wide-angle uniform light source is easily realized, and thus, compared with the analog wide-angle integrating sphere, The wide-angle integrating sphere of the present invention has a low manufacturing cost and is about one tenth of the approximate effect integrating sphere, so that the production cost is largely saved.

On the other hand, the test method of the wide-angle integrating sphere of the present invention is the same as the conventional test method, so that the wide-angle integrating sphere can be set without changing the original production line arrangement, and no special line arrangement is required. Tested by traditional test methods, the equipment is easy to move and simple to operate, and the traditional test process can be retained to the maximum extent without affecting the production test efficiency.

Those skilled in the art should understand that the embodiments of the present invention described in the above description and the accompanying drawings are only by way of illustration and not limitation. The object of the invention has been achieved completely and efficiently. The present invention has been shown and described with respect to the embodiments of the present invention, and the embodiments of the present invention may be modified or modified without departing from the principles.

Claims (96)

1. A ring-view camera module test device, which is used for testing a ring-view camera module, and includes:

   a module positioning component that is used to position the surround camera module;

   a cylinder, wherein the cylinder has an inner peripheral surface, wherein the inner peripheral surface encloses a cylindrical imaging space; and

   A light source, wherein the light source is configured to provide a uniform light source for the imaging space.
2. The surround view camera module testing device of claim 1 , wherein the imaging space is a closed space when the surround view camera module is tested, wherein the surround view camera module is disposed at a center of a diameter of the closed space .
3. The surround view camera module testing device according to claim 2, wherein said cylinder comprises a barrel body and a door, wherein said barrel body has an opening, wherein said door is sized and shaped and said opening is sized Adapted to the shape so that the opening can be closed.
4. The surround view camera module testing device according to claim 3, further comprising a top plate, wherein the top plate is tightly disposed at a top end of the cylinder, wherein the top plate has a top plate hole, wherein the top plate hole The shape and size are adapted to the shape and size of the cylinder.
5. The look-around camera module testing device according to claim 4, wherein the light source is disposed on the top plate, wherein light emitted by the light source passes through the top plate hole and uniformly irradiates the imaging space, wherein The light source is capable of closing the top of the cylinder.
6. The surround view camera module testing apparatus according to claim 5, further comprising a bottom plate, wherein the bottom plate is disposed at a bottom end of the cylinder.
7. The surround view camera module testing device of claim 6 further comprising a first door rail and an at least first door connector, wherein said first door rail is disposed on said door, wherein said A first door connector is disposed on the top panel, wherein the connector is movable along the rail.
8. The surround view camera module testing apparatus according to claim 6, further comprising a second door rail and an at least second door connector, wherein the second door rail is disposed on the bottom plate, wherein A first door connector is disposed to the door, wherein the connector is movable along the rail.
9. The look-around camera module testing apparatus according to claim 7, further comprising a second door rail and an at least second door connector, wherein the second door rail is disposed on the bottom plate, wherein A first door connector is disposed to the door, wherein the connector is movable along the rail.
10. The look-around camera module testing device according to claim 9, wherein the first door connector has a first door chute, wherein the first rail is disposed in the first door chute.
11. The look-around camera module testing device according to claim 10, wherein the second door connector has a second door chute, wherein the second rail is disposed in the second door chute.
12. The look-around camera module testing device according to claim 11, further comprising a supporting device, wherein the cylinder is disposed on the supporting device, wherein the supporting device comprises a light blocking component, Wherein the light blocking assembly comprises a light-shielding bottom, wherein the light-shielding bottom is disposed to close the bottom of the cylinder.
13. The surround view camera module testing device according to claim 12, wherein said door comprises a panel, a skeleton and a cover, wherein said skeleton is disposed between said panel and said cover and said panel and The outer cover is fixed and supported.
14. The surround view camera module testing device according to claim 13, wherein the panel, the skeleton and the outer cover are all made of sheet metal.
15. The surround view camera module testing apparatus according to claim 13, wherein said bobbin includes a plurality of square tubes and a plurality of shaped elements, wherein said square tubes connect and fix said shaped elements.
16. The surround view camera module testing device according to claim 12, wherein the module fixing component comprises a module fixing component, an adjusting component, a moving component and a guiding component, wherein the module fixing component is disposed on The adjustment element, wherein the moving element is disposed on the guiding element and movable along the guiding element, wherein the adjusting element is used to adjust a concentricity of the viewing camera module and the imaging space, wherein The moving component is used to drive the surround camera module to move within the imaging space.
17. The look-around camera module testing device according to claim 16, wherein the module fixing assembly further comprises a limiting component, wherein the guiding component has a limiting end, wherein the limiting component is disposed on the The limit end of the guiding element.
18. The look-around camera module testing device according to claim 16, wherein the module fixing component has a suction passage, wherein the suction passage has a module connection port and an intake port, wherein the suction port The port and the module connection port are connected to each other.
19. The surround view camera module test apparatus according to any one of claims 1 to 18, wherein the light source has an effective area of 1 m × 1 m, a thickness of 6 mm, and a color temperature of 5000 K.
20. The look-around camera module testing device according to any one of claims 1 to 18, wherein the module positioning component is embodied as a USB 3.0 focusing tool.
21. The surround view camera module testing device according to any one of claims 1 to 18, further comprising a target, wherein the target is disposed on the inner peripheral surface of the cylinder, wherein the target It is a reflective target.
22. The look-around camera module testing device according to claim 21, wherein the target is a gradual anti-distortion target.
23. The look-around camera module testing device according to claim 22, wherein the target comprises a series of lateral reflection strips, wherein the width of the reflective strip can be obtained by inverse distortion calculation, and the target is passed through the panoramic camera. The thickness of the imaged lines in the original image formed by the module is the same.
24. The look-around camera module testing device according to claim 22, wherein the target comprises a first reflective strip and a second reflective strip, wherein the first reflective strip and the second reflective strip are disposed to It is used to test the range of field of view of the surround camera module.
25. The surround view camera module testing device according to any one of claims 12 to 18, wherein the supporting device further comprises a bracket, wherein the light blocking assembly is disposed on the bracket, wherein the The light blocking assembly further includes a series of panels and a light barrier, wherein the panels are disposed about the cylinder, wherein the light barrier is disposed on a top of the bracket, wherein the door, The louver, the light-shielding top and the light-shielding bottom together form an anti-interference space.
26. The surround view camera module testing device according to any one of claims 12 to 18, wherein the supporting device further comprises a bracket and four supporting legs, wherein the supporting legs are disposed on the bracket to The stent provides support and is used to adjust the standing smoothness of the stent.
27. A ring-view camera module test method, which is used for testing a ring-view camera module, and is characterized in that it comprises the following steps:

    A. The look-around camera module W is disposed at a center of a diameter of a cylindrical imaging space;

    B. closing the imaging space;

    C, a light source emits uniform light and illuminates a target plate and then reaches the surround view camera module W;

    D. The surround camera module responds to the uniform light reflected by the target plate, thereby performing photoelectric conversion, thereby recording an original image;

    E. performing distortion correction on the original image; and

    F. Determine whether the resolution and the angle of view of the surround view camera module meet the requirements by using the image corrected by the original image.
28. The method for testing a look-around camera module according to claim 27, wherein the step C is embodied by: the target reflecting the uniform light emitted by the light source to the surround camera module.
29. The method for testing a surround view camera module according to claim 27, wherein the step C is embodied by: a series of reflective strips of the target plate reflecting uniform light emitted by the light source to the surround view camera module.
30. The method for testing a surround view camera module according to any one of claims 27 to 29, wherein the method of performing distortion correction on the original image in step E is software detection and correction.
31. A method for finding a lens optical center, using the lens to take a picture, wherein the method comprises the following steps:

    (A) binarizing the picture to find coordinates of at least one inner boundary or at least one outer boundary of an imaged region in the image;

    (B) fitting the inner boundary or the outer boundary into at least one inner circle or at least one outer circle, and determining coordinates of a center of each inner circle or each outer circle in an image;

    (C) The center of the inner circle or the center of the outer circle is defined as the optical center of the lens.
32. The method of claim 31, wherein the inner boundary or the outer boundary forms a grayscale gradient with a grayscale value of the imaging region, with a grayscale contrast.
33. The method of claim 31 wherein said imaged region, said inner boundary or said outer boundary is a circular region.
34. The method of claim 32, wherein the imaging region, the inner boundary, or the outer boundary is a circular region.
35. The method according to claim 34, wherein in said step (B), said inner circle or said outer circle is obtained by fitting using an average value method, a weighted average method or a least squares method.
36. A method according to any one of claims 31 to 35, wherein the color of the inner boundary or the The color of the outer boundary is different from the color of the imaged area.
37. The method of claim 36, wherein the imaging area is a white area, the inner boundary is a black area, and the outer boundary is a green area.
38. The method of claim 36, wherein the imaging area is a white area, the inner boundary is a green area, and the outer boundary is a black area.
39. The method according to claim 36, wherein said image forming area is a white area, each of said inner boundaries being an alternating area of green and black, each of said outer boundaries being an alternating area of green and black.
40. The method of claim 36, wherein the imaging area is a white area, the inner boundary and the outer boundary are both green areas or both black areas.
41. A method for finding a lens optical center, using the lens to take a picture, wherein the method comprises the following steps:

    (a) binarizing the picture to find coordinates of at least one inner boundary or at least one outer boundary of an imaging region in the image;

    (b) fitting the inner boundary or the outer boundary into at least one inner polygon or at least one outer polygon, and determining coordinates of a center of each of the inner polygons or each of the outer polygons in an image;

    (c) Deriving the center of the inner polygon or the outer polygon to derive the optical center of the lens.
42. A method according to claim 41, further comprising a step (d) of: making an inscribed circle of each of said inner polygons or a circumcircle of said outer polygons, and determining each of said inscribed circles or said each The coordinates of the center of the circumcircle in the image, the center of each of the inscribed circle or each of the circumscribed circles is obtained, and the optical center of the lens is obtained, wherein the step (d) is located after the step (c) Or the step (d) is located between the step (b) and the step (c), and further combined with the inner polygon or the center of the outer polygon in the step (c), The light center of the lens.
43. The method of claim 41, wherein the inner boundary or the outer boundary forms a grayscale gradient with a grayscale value of the imaging region, with a grayscale contrast.
44. The method of claim 42, wherein the inner boundary or the outer boundary forms a grayscale gradient with a grayscale value of the imaging region, with a grayscale contrast.
45. A method according to any one of claims 41 to 44, wherein the imaging area, the inner boundary or the outer boundary is a polygonal area.
46. The method according to claim 45, wherein the inner boundary or the outer boundary is an equilateral triangle, a square, a diamond, an equilateral triangle, a pentagon or a hexagon, and other polygons.
47. A method according to any one of claims 41 to 44, wherein the color of the inner boundary or the color of the outer boundary is different from the color of the imaged area.
48. The method of claim 47, wherein the imaging area is a white area, the inner boundary is a black area, and the outer boundary is a green area.
49. The method of claim 47, wherein the imaging area is a white area, the inner boundary is a green area, and the outer boundary is a black area.
50. The method according to claim 47, wherein said image forming area is a white area, each of said inner boundaries being an alternating area of green and black, each of said outer boundaries being an alternating area of green and black.
51. A white balance test method for a surround view camera module, characterized in that the test method comprises the following steps:

    (a) defining an annular test area within the imaging area centering on a center of the annular imaging area of the surround view camera module;

    (b) testing the white balance of the surround view camera module by calculating the pixel values in the test area.
52. The test method according to claim 51, wherein before said step (a), the method further comprises the steps of:

    (c) determining the center of the imaging area of the surround view camera module in real time.
53. The test method according to claim 51, wherein before said step (c), the method further comprises the steps of:

    (d) determining the imaging area of the surround view camera module in real time.
54. The test method according to claim 53, wherein in said step (d), the method further comprises the steps of:

    (d.1) capturing an image using the camera module; and

    (d.2) determining the imaging area of the surround view camera module based on the data of the image.
55. The test method according to claim 52, 53 or 54, wherein in said step (c), the center of said image forming region is determined by an inner diameter or an outer diameter of said image forming region.
56. The test method according to claim 51, 52, 53 or 54, wherein in said step (a), the method further comprises the steps of:

    (a.1) defining a position of the test area within the imaging area centering on a center of the imaging area; and

    (a.2) Determine the size of the test area.
57. The test method according to claim 55, wherein in said step (a), the method further comprises the steps of:

    (a.1) defining a position of the test area within the imaging area centering on a center of the imaging area; and

    (a.2) Determine the size of the test area.
58. The test method according to claim 56, wherein in said step (a.2), a sum of an inner diameter radius and an outer diameter radius of said test area is equal to a sum of an inner diameter radius and an outer diameter radius of said image forming area.
59. The test method according to claim 57, wherein in said step (a.2), a sum of an inner diameter radius and an outer diameter radius of said test area is equal to a sum of an inner diameter radius and an outer diameter radius of said image forming area.
60. The white balance automatic adjustment method of the camera module is characterized in that the automatic adjustment method comprises the following steps:

    The white balance of the surround view camera module is tested according to the test method of any one of claims 51-59;

    The white balance of the surround view camera module is automatically and in real time adjusted according to the test result of the white balance of the surround view camera module.
61. A wide-angle integrating sphere characterized by comprising:

    An outer ball;

    One stop; and

    An inner ball; wherein the inner ball has an inner space, a light source inlet and a window, the blocking member and the inner ball are disposed in the inner space of the outer ball, and the blocking member is located in the inner ball Between the light source inlet and the inner ball, so as to block light entering from the light source inlet from directly reaching the inner ball, the inner ball has a detecting port, and the detecting port and the window of the outer ball Correspondingly, in order to place a detection product on the detection port of the inner ball through the window, and the inner ball is a semi-transmissive ball, so as to be diffusely reflected through the outer ball and the block The light passes through the inner ball to provide a wide-angle uniform light source for the detection product.
62. The wide angle integrating sphere of claim 61 wherein said outer ball is an opaque ball to facilitate isolation of external light to provide a closed environment for said inner ball.
63. The wide-angle integrating sphere according to claim 62, wherein said outer ball has an outer ball inner wall having a plating layer on the inner wall to facilitate uniform reflection of light.
64. A wide-angle integrating sphere according to claim 62, wherein said inner ball comprises an inner ball inner wall and an inner ball outer wall, said inner ball inner wall and said inner ball outer wall having a plating layer for allowing light to uniformly enter said The inner ball is evenly reflected within the inner ball.
65. The wide-angle integrating sphere according to claim 64, wherein said plating of said inner ball is a Baso4 plating.
66. A wide-angle integrating sphere according to claim 61, wherein the center of said light source inlet, the geometric center of said stop, and the center of said inner sphere are in the same straight line to facilitate uniformity of light received by said inner ball.
67. A wide-angle integrating sphere according to claim 61, wherein said wide-angle integrating sphere comprises a light source, said light source being mounted to said light source inlet of said outer bulb.
68. A wide-angle integrating sphere according to claim 67, wherein said wide-angle integrating sphere comprises a controller, said controller being communicatively coupled to said light source for facilitating control of operation of said light source to accommodate detection requirements of different inspection products .
69. A wide-angle integrating sphere according to claim 67, wherein said light source is an LED light source.
70. A wide-angle integrating sphere according to claim 61, wherein said wide-angle integrating sphere comprises a bracket, said outer ball being mounted to said bracket.
71. A wide-angle integrating sphere according to claim 79, wherein said bracket comprises a bracket body and a set of walking wheels, said outer ball being mounted to said bracket body, said traveling wheel being mounted below said bracket body In order to support the wide-angle integrating sphere to walk.
72. The wide-angle integrating sphere according to any one of claims 61 to 71, wherein the blocking member is a curved surface structure, the convex side surface of the curved surface structure is opposite to the light source inlet, and the concave side surface of the curved surface structure is The inner ball is opposite.
73. A wide-angle integrating sphere according to claim 72, wherein said stop is a spherical surface.
74. A wide-angle integrating sphere according to claim 72, wherein said stopper surface has a plating layer.
75. The wide-angle integrating sphere according to any one of claims 61 to 71, wherein the outer ball comprises a first outer hemisphere and a second outer hemisphere, and the second outer hemisphere is detachably connected to the first outer hemisphere, Forming the inner space.
76. The wide-angle integrating sphere according to claim 75, wherein said second outer hemisphere is coupled to said first outer hemisphere by screwing.
77. The wide-angle integrating sphere according to claim 75, wherein said stopper is mounted to an inner side of said first hemisphere by a mounting bracket, and said inner ball is mounted inside said second hemisphere.
78. A wide-angle integrating sphere according to any one of claims 61 to 71, wherein said inner ball is integrally formed by means of 3D printing.
79. The wide-angle integrating sphere according to any one of claims 61 to 71, wherein said outer ball 3D is integrally formed by printing.
80. The wide-angle integrating sphere according to any one of claims 61 to 71, wherein the inner ball is fixed to the inside of the outer ball by screwing.
81. A wide-angle integrating sphere according to any one of claims 61 to 71, wherein said detecting port of said inner ball forms an extension duct communicating with said window of said outer ball, and said extension duct is screwed to said Window position.
82. The calculation area for calculating the shadow of the lens is selected and applied to a circular test image, which is characterized in that it comprises:

    At least one reference zone; and

    At least one test area; wherein the reference area is circular and located in a central area of the test image, the test area being circular and located at a predetermined test position within the test image.
83. A calculation area selection layout for calculating a lens shading according to claim 82, wherein the test area and the reference area have the same radius.
84. A calculation area selection layout for calculating a lens shading according to claim 83, comprising a plurality of said test areas uniformly distributed in said test image.
85. A calculation area selection layout for calculating a shadow of a lens according to claim 83, comprising a plurality of said test areas distributed radially in a radial direction to said test image.
86. A calculation area selection layout for calculating a lens shading according to claim 83, comprising a plurality of said test areas symmetrically distributed around said reference area.
87. A calculation area selection layout for calculating a lens shading according to any one of claims 84 to 86, wherein the reference area and the center of the test image are the same.
88. The calculation area selection layout for calculating a shadow of a lens according to claim 87, wherein a center of said plurality of said test areas is located on a gradient ring, said gradient ring being the same as a center of said reference area.
89. The calculation region selection layout for calculating a shadow of a lens according to claim 87, wherein said plurality of said test regions are divided into a plurality of gradient portions, and said test region of said same gradient portion is distance from said reference The distances of the zones are the same, and the distances of the test zones different from the gradient zone are different from the reference zone.
90. A calculation area selection layout for calculating a lens shading according to claim 89, wherein a plurality of said test areas are symmetrically distributed outside said reference area.
91. A calculation area layout selection method for calculating a shadow of a lens, characterized in that the method comprises the following steps:

    (A) obtaining a central coordinate O1 (x, y) of a circular test image and a radius R;

    (B) taking a center O1 (x, y) of the test image as a center, taking r as a radius, taking a circular reference region; and

    (C) taking a circular test area having a radius r outside the reference area within the test image.
92. The method of claim 91 wherein the selection of the radius r in step (B) is referenced to radial pixels of the test image.
93. The method according to claim 91, wherein said step (C) comprises the step of determining a center coordinate O2 (x2, y2) of any of said test zones, such that a center of the circle O1 (x1, y1) of said test image is The center of the circle takes a gradient ring with a radius of O1O2.
94. The method according to claim 93, wherein said step (C) comprises the step of: taking a plurality of said test zones of radius r at different positions on said gradient ring, with respect to different positions of said reference zone symmetry .
95. The method according to claim 94, wherein said step (C) comprises the steps of: taking a plurality of said gradient rings of different radii, respectively taking said test zones at corresponding positions on different said gradient rings.
96. The method according to any one of claims 91 to 95, comprising the step (D) of acquiring the respective brightness values of the test area and the reference area, thereby obtaining a lens shading value.

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