TW201514569A - Method for adjusting focusing point with a 3d object and system thereof - Google Patents

Abstract

The present invention provides a method for adjusting focusing point with a 3D object, which adjusts the focusing point of a lens module such that the lens module focuses on a predetermined position, the method comprising: providing a 3D object, wherein the 3D object is a pyramid or a cone having a top; positioning the lens module such that the top substantially aligns the optical axis of the lens module, wherein the top and the lens module are separated by a distance; adjusting the focusing point of the lens module such that a first image is formed, wherein part of the image of the 3D object is clear; calculating the position of the lens module focusing point corresponding to the first image; and adjusting the focusing point of the lens module after the forming of the first image.

Description

Stereo focusing method and system thereof

The present invention relates to a focusing method and system thereof, and more particularly to a focusing method using a 3D object and a system therefor.

The image module is a set of camera components built into cameras, mobile phones, tablets, and laptops. It consists of main components such as lenses, image sensors, boards, and connectors. Before being mounted to the above electronic device, the focus point of the image module needs to be adjusted (the distance between the lens and the image sensor in the image module determines the position of the focus), so that the image module is focused on a predetermined position; In the case of an image module for a mobile phone, the focus position is preset to be 60 cm away from the image module, so the focus point of the image module needs to be adjusted to the above before being mounted to the mobile phone. The predetermined position, this process is called module focusing; in the case of common image modules, the process of focusing the module is to rotate the lens in the image module to make the lens and image sensor in the image module. The relative distance changes. During the adjustment process, the image of the object at the predetermined position (in the case of the above-mentioned mobile phone, which is 60 cm away from the image module) gradually becomes clear from the blur.

The image module is adjusted, usually by machine or manual rotation of the lens to the lens mount, and the position of the focus above the image module is set to a plane test chart (as shown in the eighth figure of the figure), and then rotated Focusing ring on the lens, and observe the image of the test chart in the screen. When the image reaches a certain definition, stop rotating the lens and complete the focusing program. This is the plane focusing method. In the plane focusing method, a single plane can be used. Test chart, you can also use multiple plane test charts placed in different positions, layer-by-layer focusing and testing; plane focusing method is the mainstream method of focusing in the industry, which has the advantages of simple hardware equipment and less investment. The device can be quickly adjusted for different devices and different types of modules; the main disadvantage is that the required space is large, for example, if the predetermined focus position is two meters away from the image module, It has a space of at least two meters in length to place the plane test chart and image module. Furthermore, in the system using multiple plane test charts, the entire focusing process will be repeated multiple times between adjusting the focus point and the program interpretation image. As a result, the focusing process is lengthy and the output cannot be improved.

Another advanced focusing method is the reverse projection focusing method, which requires a high magnification magnifying lens to be placed on the optical axis of the unfocused image module, and the operation mode is to adjust the high magnification magnifying glass and the image. The distance between the modules is such that the pattern of the RGB three primary colors of the color filter in front of the image sensor in the image module is clearly imaged, and then the distance between the high magnification magnifier and the image module is fed back to an automatic program, and a calculation is generated. Adjust the signal to rotate the focus ring to the best focus position at one time. This method can quickly adjust the focus of the image module and improve its output, but the equipment of the reverse projection focusing method is expensive, and the focusing mode can only achieve the best focusing for the image center, and can not take into account the surrounding edges of the image. .

In summary, the current industry lacks an image module focusing method, which has multiple advantages such as simple equipment, small space required, rapid adjustment process and flexibility, so the cost and output of the module can not be balanced. .

In view of the shortcomings of the prior art, in order to reduce the cost of module focusing, and at the same time increase its output, and effectively reduce the required space of the test equipment, the present invention provides a stereo focusing method for adjusting an image module. Focusing on the image module to focus on a predetermined position, the method comprising: providing a cone having a top end portion, and the tip end portion of the cone is spaced apart from the image module such that the top end portion of the cone is substantially Aligning with the optical axis of the image module; adjusting a focus point of the image module to form a first image, in which the portion of the cone image is clear; according to the first image For example, calculating a position of a focus point of the image module when the first image is formed; and adjusting a focus point of the image module after forming the first image.

Preferably, the stereo focusing method provided by the present invention further includes: forming a second image, wherein another portion of the cone image is clear in the second image; and calculating the image module according to the second image a position of a focus point when the second image is formed; and adjusting a focus point of the image module after the second image is formed to the predetermined position.

Preferably, in the stereo focusing method provided by the present invention, the distance between the top end of the cone and the image module is greater than or equal to the closest focusing distance of the image module.

Preferably, in the stereo focusing method provided by the present invention, the focus distance of the image module after forming the second image is adjusted to be farther than the focus distance of the second image.

Preferably, in the stereo focusing method provided by the present invention, the cone has an axial center, the top end portion is located on the axis, and the structure of the cone is symmetrical with respect to the axis.

Preferably, in the stereo focusing method provided by the present invention, the image module includes an image sensor, the image sensor has a short side, the cone has a bottom, and the bottom of the cone is on the image. The imaging of the sensor can completely cover the short side of the image sensor.

Preferably, in the stereo focusing method provided by the present invention, the fixed distance between the top end portion of the cone and the image module is between 5 cm and 20 cm.

Preferably, in the stereo focusing method provided by the present invention, the predetermined position of the focus and the distance of the image module are less than 60 cm.

Preferably, in the stereo focusing method provided by the present invention, the predetermined position of the focus and the distance of the image module are between 60 cm and 1 metre.

Preferably, in the stereo focusing method provided by the present invention, the distance between the predetermined position of the focus and the image module is greater than 1 meter.

Preferably, in the stereo focusing method provided by the present invention, a correction lens module is disposed between the image module and the cone.

Preferably, in the stereo focusing method provided by the present invention, the cone system has a polygonal or circular cross section.

Preferably, in the stereo focusing method provided by the present invention, the cone may be a concave Cone.

Preferably, in the stereo focusing method provided by the present invention, the surface of the cone has a black and white phase.

Preferably, in the stereo focusing method provided by the present invention, the surface of the cone has a scale.

The present invention provides a stereo focusing system for adjusting a focus point of an image module to focus the image module at a predetermined position. The system includes: a cone having a top end portion, the image The module captures one or more images of the cone at one or more in-focus positions; a computing module receives and analyzes the one or more images to calculate that the image module corresponds to the one or more images The one or more focus positions are configured to generate an adjustment signal; and an automatic adjustment module receives the adjustment signal to adjust a focus point of the image module to the predetermined position.

Preferably, in the stereo focusing system provided by the present invention, the distance between the top end of the cone and the image module is greater than or equal to the closest focusing distance of the image module.

Preferably, in the stereo focusing system provided by the present invention, the focal length corresponding to the image module corresponding to the predetermined position is greater than the focal length of the image module corresponding to the one or more images.

Preferably, in the stereo focusing system provided by the present invention, the cone has an axis, the top end is located on the axis, and the structure of the cone is symmetrical with respect to the axis.

Preferably, in the stereo focusing system provided by the present invention, one of the cones is partially clear in the one or more images.

Preferably, in the stereoscopic focusing system provided by the present invention, the image module includes an image sensor, the image sensor has a short side, the cone has a bottom, and the image module captures the cone Among the one or more images, the bottom of the cone can completely cover the short side of the image sensor.

Preferably, in the stereo focusing system provided by the present invention, the fixed distance between the top end portion of the cone and the image module is between 5 cm and 20 cm.

Preferably, in the stereo focusing system provided by the present invention, the cone system has a polygonal body or a circular body cross section.

Preferably, in the stereo focusing system provided by the present invention, the surface of the cone has a black and white phase.

Preferably, in the stereo focusing system provided by the present invention, the surface of the cone has a scale.

Preferably, in the stereo focusing system provided by the present invention, a correction lens module is disposed between the image module and the cone

Preferably, in the stereo focusing system provided by the present invention, the cone may be a concave cone.

100‧‧‧ cone

101‧‧‧ bottom

102‧‧‧Top part

200‧‧‧Image Module

300‧‧‧Computation Module

400‧‧‧Automatic adjustment module

500‧‧‧ cone

501‧‧‧First focus position

502‧‧‧second focus position

503‧‧‧Image module

504‧‧‧Predetermined focus position

600‧‧‧ concave cone

601‧‧‧First focus position

602‧‧‧second focus position

603‧‧‧Image Module

604‧‧‧Predetermined focus position

The first figure illustrates a cone for focusing in the stereo focusing method of the present invention.

The second figure illustrates the stereo focusing system of the present invention.

The third figure is a schematic view of cone imaging in the first embodiment of the present invention.

The fourth A is an actual imaging of the cone in the stereo focusing method of the present invention.

The fourth B is another actual imaging of the cone in the stereo focusing method of the present invention.

The fifth A diagram illustrates another cone for focusing in the stereo focusing method of the present invention.

Fig. 5B is a schematic view showing the imaging of the cone shown in Fig. 5A.

The sixth figure illustrates another cone for focusing in the stereo focusing method of the present invention.

Fig. 7A is a side view showing the arrangement of the stereoscopic focusing method of the present invention by using a cone.

Fig. 7B is a side view showing the arrangement of the stereoscopic focusing method of the present invention by using a concave cone.

The eighth figure illustrates a standard test pattern used in prior art planar focusing methods.

The present invention will be fully described with reference to the preferred embodiments of the invention and the accompanying drawings. The described invention simultaneously achieves the efficacy of the present invention. Therefore, the following description of the invention is to be understood as a

The first embodiment of the present invention exemplifies a stereo focusing method for adjusting a focus point of an image module to focus the image module on a predetermined position. The image module is used for a main lens of the smart phone, and includes a lens with a focal length of 4mm and a 1/3" image sensor (length 4.8mm, width 3.6mm), this combination provides a viewing angle of about 74°, the lens aperture value is f/2; For example, the predetermined position of the image module in focus (ie, the focus point after focusing is completed) is set at 60 cm from the image module.

In this embodiment, a cone system is utilized to adjust a focus point of the lens module, the cone has an axis, and has a top end portion 102 on the axis, the structure of the cone relative to the axis The heart is symmetrical, and in the present embodiment, a pyramid type cone is taken as an example, and the invention is not limited thereto. The principle of the stereoscopic focusing method of the present invention is substantially as follows: the pyramid type cone system is imaged by the lens module, and by analyzing the image, the current focus position of the lens module can be obtained, and thus the distance from the predetermined focus position can be calculated. After adjusting the amount, finally adjust the focus point of the lens module to the predetermined position. As shown in the first figure of the present invention, the pyramid-shaped cone 100 has a square cross section, and the bottom portion 101 is a square of 8 cm square, and the height from the tip end portion 102 of the cone to the bottom portion 101 of the cone is 10 cm. The four sides of the cone are symmetrical with respect to the axis of the cone and the surface thereof has a black and white pattern or a scale; the top end portion 102 to the bottom portion 101 of the cone are continuous slopes with a fixed slope; The height and the size of the bottom of the cone are designed according to the actual convenience of the installation, as well as the parameters of the image module lens and image sensor.

The second figure of the drawing illustrates the arrangement of various hardware when operating the stereo focusing method of the present invention. The cone 100 is disposed above the lens module 200. The top end portion 102 of the cone 100 and the axis are substantially aligned with the optical axis of the image module 200. The center of gravity of the cone 100 is also substantially the same as that of the image module 200. The top end portion 102 is spaced apart from the image module 200 by 5 cm, and the top end portion 102 can be a tip end or a flat surface. It should be noted that in the stereo focusing method provided by the present invention, the cone is provided. Tip and cone The alignment of the axis of the body with the optical axis of the image module is not a necessary condition, but it is set to a general setting, which is also simplified when analyzing the cone image (the image will be symmetric to the center of the image). In addition, the distance between the top end portion 102 of the cone and the image module 200 is not particularly limited. Preferably, the distance may be greater than or equal to the closest focusing distance of the image module 200, so that the cone can pass through the image module. The lens is imaged on the image sensor. For the purpose of autofocusing, as shown in the second figure, a computing module 300 is configured to receive image data of the cone 100 from the image module 200 and analyze the image data; in addition, the calculation module 300 transmits control The signal is sent to an automatic adjustment module 400. The automatic adjustment module 400 adjusts the focus ring of the lens module 200 according to the control signal to change the position of the focus. In another embodiment, the manual adjustment is also manually performed according to the product specifications. The focus ring of the lens module 200 is adjusted to adjust the lens module 200 to a predetermined position of focus.

After the setting of the cone 100 and the lens module 200 is completed, the stereo focusing method provided by the present invention performs a first focusing step. In this step, the computing module 300 will drive the automatic adjustment module 400. To adjust the position of the lens module 200 to focus, the purpose of which is to form a first image, the position of the focus point after the first focusing step is referred to as a first focus position, and in the first image, a portion of the cone 100 Clear. The image of the cone 100 will be as shown in the third figure without considering the position of the depth of field, but in the actual case, the cone 100 is a one-dimensional object distributed in the space, and the tip end portion 102 of the cone 100 The image is closer to the image module 200, and the bottom 101 is farther from the image module 200. Therefore, if the focus of the image module is between the top end portion 102 and the bottom portion 101, a partial sharpness may be formed. Partially blurred image; the fourth A picture illustrates the actual image of the cone 100 when the focus point is at the top end of the cone 100. As can be seen from the fourth A picture, the top end of the cone 100 is clearer and close. The image at the bottom is more blurred; the fourth B diagram illustrates the actual image of the cone 100 when the focus is at the bottom of the cone 100. As can be seen from the fourth B, the bottom of the cone 100 is clearer and closer. The image at the top is more blurred.

In this embodiment, the calculation module 300 analyzes one of the first images after the first focusing step, and calculates the actual first focus position of the image module 200 at the distance. The image module is 10 cm apart, and the predetermined position of the image module is 60 cm away from the image module. Therefore, the focus position of the image module 200 needs to be adjusted by 50 cm, and the calculation module 300 can be based on this. An adjustment amount is generated to generate an adjustment signal to control the automatic adjustment module 400 to adjust the focus point of the image module 200 to a predetermined position. In this embodiment, the calculation module 300 only needs to adjust the information of the focus to 50 cm, that is, the adjustment signal transmitted to the automatic adjustment module 400 is calculated, and the automatic adjustment module 400 sets the image module according to the adjustment signal. The focus point of 200 is adjusted to the predetermined position; in a group of image modules with the same specifications and very small process error, the difference between the samples is extremely low, so the adjustment signal and the focus adjustment can be found only by observing a small number of samples. The relationship (specifically, the relationship between the amount of rotation of the focus ring and the amount of focus shift of the image module), so that for the same batch of image modules, the calculation module 300 may be as shown in the first embodiment of the present invention. The above adjustment signal is derived only on the basis of the distance to be adjusted by the focus point; however, in the actual case, the error between the samples may not be well controlled, if the focus is adjusted according to the method according to the first embodiment of the present invention. There may be cases where the focus position accuracy is insufficient and the error is out of the allowable range.

In the second embodiment of the present invention, an improved stereo focusing method is exemplified to avoid the above disadvantages. The hardware structure and arrangement of the second embodiment of the present invention are completely the same as the first embodiment of the present invention; after the setting of the cone 100 and the image module 200 is completed, the stereo focusing method of the second embodiment of the present invention performs one The first focusing step, in which the computing module 300 will drive the automatic adjusting module 400 to adjust the position of the image module 200 to focus, the purpose of which is to form a first image, the first image, the cone One part of the 100 is clear. According to the first image that is clear, the calculation module 300 can analyze the position of the focus of the image module 200 after the first focusing step, which is called the first focus position; a focusing step, in which the computing module 300 drives the automatic adjusting module 400 again, and rotates the focusing ring of the image module 200 by a fixed amount to form a second image. In the second image, the cone 100 The other part is clear. According to the second image that is clear, the calculation module 300 can analyze the position of the focus of the image module 200 after the second focusing step, which is called the second focus position. The calculation module 300 can calculate the relationship between the amount of rotation of the focus ring of the image module 200 and the amount of focus movement of the image module according to the first focus position and the second focus position; and the calculation module 300 according to the second focus position And the predetermined position of the focus point, the distance that the image module 200 needs to be adjusted to the focus can be calculated, and an adjustment signal is calculated to control the automatic according to the relationship between the rotation amount of the focus ring and the focus movement amount of the image module. The adjustment module 400 adjusts the focus point of the image module 200 to a predetermined position. In the method shown in the second embodiment of the present invention, for each image module, the relationship between the amount of rotation of the focus ring and the amount of focus movement of the image module is obtained, so in the last step, the estimation of the adjustment signal will not be It will be affected by the difference between the samples, and the accuracy of focusing can be improved.

It can be seen from the above two embodiments that the present invention utilizes the characteristics of the three-dimensional object having a near-distance distribution with respect to the image module 200, resulting in a partially clear and partially blurred image, and the image is clear by analyzing the image. In part, the actual first focus position of the image module 200 and the actual second focus position in the second embodiment can be calculated; and whether a partially clear and partially blurred image can be formed, and the image module lens is Aperture value, focal length and the position of the actual focus point are related. In principle, a larger aperture, a longer lens focal length, and a closer focus point help to form a shallow depth of field (an image with a larger blur range); In the first embodiment and the second embodiment of the invention, in the case where the aperture and the focal length of the lens are both fixed values, the actual focus position affects the range of image sharpness and blur, and thus the cone 100 and the image module 200 The distance is very important. The distance is too far. The image of the entire cone falls into a clear range and the distance is too close. The clear part of the cone image may be too small and has a trapping difficulty. .

The following table 1 shows the relationship between the actual focus position and the clear image range of the image module 200 used in the first embodiment and the second embodiment of the present invention, wherein the actual focus position and the clear image range are both The distance represented by group 200 is represented.

It can be seen from Table 1 that for the image module 200 used in the first embodiment and the second embodiment of the present invention, the actual focus position is 5 centimeters to 40 cm from the image module, and a corresponding correspondence can be obtained. The clear image range, the closer focus position corresponds to a smaller clear image range, and the farther focus position corresponds to a larger clear image range. However, if the first focus position or the second focus position is 40 cm away from the image module, it is difficult to complete the focus in a limited space; obviously, the reason is that the range of the clear image is too large (by 32.79 cm to 51.27 cm), so the height of the cone will be at least greater than the range of the clear image, which is 18.48 cm. In fact, the height of the cone will be much larger than this value, because there must be enough blurring in the image. Therefore, if the distance between the cone 100 and the image module 200 is 40 cm (meaning that the first focus position or the second focus position is greater than 40 cm from the image module 200), the length of the entire focusing system is required. A rough estimate of more than one meter will lose the advantage of the space required for the invention. Obviously, if the image module 200 of the first embodiment and the second embodiment of the present invention is used, the distance between the cone and the image sensor is about 5 cm to 20 cm; between the cone and the image sensor. The distance between 20 cm and 40 cm is theoretically feasible, but the size of the system is actually too large. This setting is practical for images with larger lens aperture, longer focal length, and larger image sensor. Modules, among the currently available mobile phones, there are indeed a few high-end image modules. On the contrary, compared to this issue The image module used in the embodiment has a lower-order image module (smaller aperture, shorter focal length, and smaller image sensor). When using the stereo focusing method provided by the present invention, the cone and The distance between image sensors may be less than 5 cm. Therefore, in order to reduce the space required for the test device, in the first embodiment and the second embodiment of the present invention, the preferred embodiment is to calculate the image module by using the first image and the second image with a close focusing distance. The distance to be adjusted is adjusted to adjust the image module to the predetermined focus position with a long focal length. In short, the present invention uses the focus test step with a close focal length to calculate the required focus position for a longer focal length. The amount of adjustment, thus eliminating the need for a far-focus adjustment, a large test tool, thereby reducing the test space, increasing test efficiency and productivity; in summary, the distance between the cone and the image module can be in accordance with the specifications of the image module Optimized; in addition, a correction lens module can be arranged between the cone and the image module to simulate the imaging mode of the image module in the far focus without increasing the volume of the device.

In the first embodiment and the second embodiment of the present invention, the predetermined position of the image module focusing (ie, the focus point after focusing is completed) is 60 cm away from the image module, but the stereo focusing provided by the present invention The method is not limited to the above range, and the stereo focusing method provided by the present invention can be applied to the focus adjustment within 60 cm, and can also be applied to the center focus (the focus point distance image module after completion of focusing is 60 cm) Up to one meter) even the far focus (the focus of the focus is greater than one meter after the focus adjustment). In the adjustment of the far focus and the medium focus, the maximum difference between the near focus (the focal point distance image module after the focus adjustment is completed within 60 cm) shown in the foregoing embodiment of the present invention lies in the first In the near focus adjustment of the embodiment, the first focus position is closer to the focus position after focusing, so the final automatic adjustment module rotates the focus ring by adjusting the focus point from the first focus position to the predetermined position (ie, Rotating a few degrees), and the first focus position and the focus position after focusing, it is still possible to roughly exhibit a linear relationship. When the linear relationship exists, the calculation module 300 according to the first focus position and the focus position after focusing The difference between the calculation and the adjustment signal finally transmitted to the automatic adjustment module will be relatively simple; in the second embodiment, the adjustment signal finally transmitted to the automatic adjustment module is calculated according to the difference between the second focus position and the focus position after the focus adjustment. The same is true.

However, the above linear relationship will produce a large difference when the focus position is greatly adjusted. In order to improve the accuracy of the adjustment, in the case of the mid-focus adjustment and the far-focus adjustment, the following simple imaging formulas can be utilized. All object distance conversion imaging distance: 1/u+1/v=1/f [1] In formula [1], u is the object distance, v is the image distance and f is the focal length of the image module lens. Regarding the application of the formula, the following description will be made with a third embodiment similar to the second embodiment of the present invention. The hardware structure and arrangement of the third embodiment of the present invention are completely the same as the second embodiment of the present invention; after the setting of the cone 100 and the image module 200 is completed, the stereo focusing method of the third embodiment of the present invention performs one The first focusing step, in which the computing module 300 will drive the automatic adjusting module 400 to adjust the position of the image module 200 to focus, the purpose of which is to form a first image, the first image, the cone A portion of the 100 is clear. According to the portion of the first image that is clear, the computing module 300 can analyze the position of the focus of the image module 200 after the first focusing step, which is called a first focus position, and the first focus position is The distance of the image module 200 is an object distance (actually a distance from a point on the cone to the lens of the image module 200), so the distance between the first focus position and the image module 200 can be converted by using the formula [1]. A first image distance is followed by a second focusing step. In this step, the calculation module 300 drives the automatic adjustment module 400 again, and rotates the focus ring of the image module 200 by a fixed amount to form a first Two images, in the second image The other part of the cone 100 is clear. According to the second image of the part, the calculation module 300 can analyze the position of the focus of the image module 200 after the second focusing step, which is called the second focus position. The second focus position can also be converted to a second image distance by the formula [1]. The calculation module 300 can estimate the relationship between the amount of rotation of the focus ring of the image module 200 and the amount of change of the image module image distance according to the first image distance and the second image distance; the calculation module 300 is based on the predetermined position of the focus point. By converting the formula [1] to the final image distance, and then according to the second image distance and the final image distance, the image distance of the image module 200 to be adjusted can be calculated, and according to the rotation amount and the image mode of the focus ring The relationship between the image distance change amount is calculated, and an adjustment signal is calculated to control the automatic adjustment module 400 to adjust the focus point of the image module 200 to a predetermined position. The method shown in the third embodiment above can be used not only in the middle focus And the adjustment of the far focus, the application of the near focus adjustment, can also achieve more accurate focus results.

In various embodiments of the present invention, the distance between the top end of the cone and the image module is 5 cm, the height of the cone is about 10 cm, and the bottom of the cone is a square of 8 cm square. In this configuration, through the embodiment. In the image module 200, the range of the cone imaging is about a square, and the side length of the square is two-thirds of the length of the short side of the image sensor 200; in a more ideal state, Select a cone with the same height but a larger bottom area (a chunky, slower slope), so that the bottom of the cone (the first image, the second image) can completely cover the shortness of the image sensor. In this way, the accuracy of the calculation module 300 during image analysis can be improved, and other analysis (such as lens edge quality analysis) can be performed on the surrounding area of the image. Of course, this setting is not absolutely necessary; In this condition, the cone of the appropriate height and the bottom size is set according to the focal length of the image module lens, the size of the sensor, and the distance between the image module and the tip end of the cone.

As described above, the present invention utilizes a cone as a three-dimensional object having a depth to cause a change in image clarity and blur, thereby identifying a focus point and for focusing; thus, in various embodiments of the present invention, a cone is used. Although shown in Figure 1, the texture and shape of the cone are not limited. Figure 5A shows another cone that can be used in the stereo focusing of the present invention, the shape of which is the same as that of the cone shown in the first figure, but the texture is different, and the fifth panel B is imaged by the image module. (The effect of the depth of field is not considered); in addition, as described above, the present invention utilizes the characteristics of the cone 100 relative to the image module 200 as a three-dimensional object having a near-distance distribution to perform test adjustment, in accordance with the above principles. The shape of the cone can also be varied, such as the cone shown in Figure 6, or other polygonal cones, can be used in the present invention, and a concave cone can also be implemented based on the same principle. The present invention; FIG. 7B is a view showing the arrangement of the stereo focusing method of the present invention using a concave cone, and FIG. 7A illustrates the setting of the stereo focusing method of the present invention using a general cone, Corresponding to the comparison with the seventh B map. In the seventh embodiment, the image module 503 is placed under the cone 500, and the image module 503 can focus on the first focus position 501 and/or the second focus position 502. The first image and/or the second image of the cone 500 is captured, and the predetermined focus position 504 of the image module (ie, the focus position after focusing) is not limited by the distance from the image module 503. It can be much larger than the distance from the image module 503 to the bottom of the cone 500; in general, the predetermined focus point position 504 is at a distance of 60 cm to infinity from the image module 503. Figure 7B has a similar arrangement. The image module 603 is placed under a concave cone 600. The inner surface of the concave cone 600 has black and white lines or scales, and the image module 603 Focusing on the first focus position 601 and/or the second focus position 602, capturing the first image and/or the second image of the concave cone 600, and the predetermined focus position 604 and the image module 603 of the image module The distance is also not limited. Generally speaking, the distance is between 60 cm and infinity; as can be seen from the seventh and seventh B, the invention is implemented using a general cone or a concave cone. There is virtually no difference in the stereoscopic focusing method disclosed. It should be noted that, in the present invention, the shape of the cone is not limited at all, but considering the convenience of fabrication and simplifying the consideration of image analysis, the cone having a symmetrical shape and a regular polygon is still used. For the sake of priority, the aspect ratio of the image module may also be adjusted, and the present invention is not limited thereto.

Embodiments of the present invention exemplify the method and system for stereo focusing of the present invention, and disclose details of the focusing method and system setting to achieve the present invention to complete the image module quickly and accurately with simple equipment and limited space. Focusing, so the module is adjusted to produce output and reduce its cost.

100‧‧‧ cone

101‧‧‧ bottom

102‧‧‧Top part

200‧‧‧Image Module

300‧‧‧Computation Module

400‧‧‧Automatic adjustment module

Claims (27)

A stereo focusing method for adjusting a focus point of an image module to focus the image module on a predetermined position, the method comprising: providing a cone having a top end portion, and the top end portion of the cone and the image module The first end of the cone is substantially aligned with the optical axis of the image module; the focus of the image module is adjusted to form a first image, and in the first image, the cone image is The portion is clear; the position of the focus point of the image module when the first image is formed is calculated according to the first image; and the focus point of the image module after the first image is formed is adjusted. The stereoscopic focusing method of claim 1, wherein after adjusting the focus point of the image module after forming the first image, the method further comprises: forming a second image, in the second image, The other part of the cone image is clear; the position of the focus point of the image module when the second image is formed is calculated according to the second image; and the focus point of the image module after the second image is formed is adjusted to The predetermined location. The stereoscopic focusing method of claim 2, wherein the distance between the top end of the cone and the image module is greater than or equal to the closest focusing distance of the image module. The stereoscopic focusing method of claim 2, wherein the focus distance of the image module after forming the second image is farther than the focus distance of the second image. The stereoscopic focusing method of claim 1, wherein the cone has an axis, the tip portion is located on the axis, and the structure of the cone is symmetrical with respect to the axis. The stereoscopic focusing method of claim 1, wherein the image module comprises an image sensor, the image sensor has a short side, and the cone has a bottom. The imaging of the bottom of the cone to the image sensor can completely cover the short side of the image sensor. The stereoscopic focusing method of claim 1, wherein the fixed distance between the top end portion of the cone and the image module is between 5 cm and 20 cm. The stereo focusing method according to claim 1, wherein the predetermined position of the focus and the distance of the image module are less than 60 cm. The stereoscopic focusing method of claim 1, wherein the predetermined position of the focus and the image module are between 60 cm and 1 metre. The stereoscopic focusing method of claim 1, wherein the predetermined position of the focus and the distance of the image module is greater than 1 meter. The stereoscopic focusing method of claim 1, wherein a correction lens module is disposed between the image module and the cone. The stereoscopic focusing method of claim 1, wherein the cone system has a polygonal or circular cross section. The stereoscopic focusing method of claim 1, wherein the cone is a concave cone. The stereoscopic focusing method of claim 1, wherein the surface of the cone has a black and white phase. The stereoscopic focusing method of claim 1, wherein the surface of the cone has a scale. A stereo focusing system for adjusting a focus point of an image module to focus the image module on a predetermined position, the system comprising: a cone having a top end, the image module being in a Or capturing one or more images of the cone at a plurality of in-focus positions; a computing module receiving and analyzing the one or more images to calculate the image module corresponding to the one or more images a plurality of focus positions to generate an adjustment signal; and an automatic adjustment module to receive the adjustment signal to focus the image module The point is adjusted to the predetermined position. The stereoscopic focusing system of claim 16, wherein the distance between the top end of the cone and the image module is greater than or equal to the closest focusing distance of the image module. The stereoscopic focusing system of claim 16, wherein the focal length of the image module corresponding to the predetermined position is greater than the focal length of the image module corresponding to the one or more images. The stereoscopic focusing system of claim 16, wherein the cone has an axis, the tip portion is located on the axis, and the structure of the cone is symmetrical with respect to the axis. The stereo focusing method of claim 16, wherein one of the cones is partially clear in the one or more images. The stereoscopic focusing method of claim 16, wherein the image module comprises an image sensor, the image sensor has a short side, the cone has a bottom, and the image module captures the cone Among the one or more images of the body, the bottom of the cone can completely cover the short side of the image sensor. The stereoscopic focusing system of claim 16, wherein the fixed distance between the top end portion of the cone and the image module is between 5 cm and 20 cm. The stereoscopic focusing system of claim 16, wherein the cone system has a polygonal body or a circular body. The stereoscopic focusing system of claim 16, wherein the surface of the cone has a black and white phase. The stereoscopic focusing system of claim 16, wherein the surface of the cone has a scale. The stereoscopic focusing system of claim 16, wherein a correction lens module is disposed between the image module and the cone. The stereoscopic focusing system of claim 16, wherein the cone is a concave cone.