CN112887704A - Camera performance test card and camera test system - Google Patents
Camera performance test card and camera test system Download PDFInfo
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- CN112887704A CN112887704A CN201911205577.5A CN201911205577A CN112887704A CN 112887704 A CN112887704 A CN 112887704A CN 201911205577 A CN201911205577 A CN 201911205577A CN 112887704 A CN112887704 A CN 112887704A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04N17/002—Diagnosis, testing or measuring for television systems or their details for television cameras
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Abstract
The disclosure relates to a camera performance test card and a camera test system. The focusing marks arranged at the center positions of the color blocks improve the focusing efficiency of the camera module; and because a plurality of color lump arrays with focusing marks are arranged, the camera performance test card can use the same algorithm for testing camera modules with different specifications, and can realize the simultaneous test of a plurality of camera modules. Therefore, the testing effect, compatibility and testing efficiency of the camera performance testing card and the camera testing system using the camera performance testing card are improved.
Description
Technical Field
The present disclosure relates to the field of electronic technology, and in particular, to a camera performance test card and a camera test system.
Background
Electronic products such as mobile phones generally include a camera module, and the camera module is required to pass a performance test before being applied to the products, so as to ensure that the camera module of the electronic device meets an expected shooting requirement.
The analysis force of the imaging system is one of key indexes for evaluating the performance of the camera module, and a camera performance test card is needed when the analysis force of the imaging system is tested. The camera module to be tested shoots the camera performance test card to obtain a test image, and the test image is analyzed through a corresponding algorithm, so that the resolving power of the camera module to be tested is judged.
However, due to the structural limitation of the camera performance test card in the related art, the focusing difficulty of the camera module in the test shooting process and the synchronous test difficulty of the camera modules with different specifications are increased.
Disclosure of Invention
The utility model provides a camera capability test card and camera test system to satisfy under the prerequisite of different specification camera module synchronous test, promote the convenience of focusing of camera module in the test shooting process.
According to a first aspect of the present disclosure, a camera performance test card is provided, which is used in combination with a camera module, and includes a plurality of color blocks arranged in an array; the sides of the color blocks are obliquely arranged relative to the transverse datum and the longitudinal datum of the camera performance test card, the colors of the adjacent color blocks are different, and a focusing mark is arranged at the center position of each color block.
Optionally, the shape of the color block is a rectangle.
Optionally, the sizes of the color blocks are the same.
Optionally, the color blocks include white color blocks and black color blocks which are alternately arranged.
Optionally, an inclination angle between the edge of the color block and the longitudinal reference of the camera performance test card includes 3 degrees to 10 degrees.
Optionally, the focus mark includes a line disposed at the center of the color block, and a preset ratio exists between a characteristic size of the line and a characteristic size of the color block.
Optionally, the focusing mark includes a first straight line and a second straight line which are arranged at the center of the color block in a crossed manner, one of the first straight line and the second straight line is at an angle of 45 degrees with the horizontal reference of the camera performance test card, and the other is at an angle of-45 degrees with the horizontal reference of the camera performance test card.
Optionally, the line includes a continuous solid line and/or a plurality of line segments arranged intermittently.
Optionally, the lines enclose one of an unclosed circle, a triangle and a rectangle.
Optionally, the camera performance test card includes a substrate layer and a functional layer disposed on the substrate layer, and the color block is formed on the functional layer.
Optionally, the substrate layer is a film, and the functional layer is a printing layer disposed on the substrate layer.
According to a second aspect of the present disclosure, a camera test system is provided, where the camera test system includes a test device, a camera module, and the camera performance test card, and the camera module is electrically connected to the test device; the camera module is located camera performance test card top, just the horizontal direction of shooing of camera module corresponds to one in the horizontal benchmark of camera performance test card and the vertical benchmark, the vertical direction of shooing of camera module corresponds to another in the horizontal benchmark of camera performance test card and the vertical benchmark.
Optionally, the camera test system includes a plurality of camera modules, the camera capability test card cooperates in a plurality of the camera module.
The technical scheme provided by the embodiment of the disclosure can have the following beneficial effects:
the camera performance test card is provided with a plurality of color blocks, the sides of the color blocks are inclined relative to the transverse reference and the longitudinal reference of the camera performance test card, the center of each color block is provided with a focusing mark, and after a camera module rapidly focuses on the focusing mark to shoot the camera performance test card to obtain a test image, the inclined boundaries between adjacent color blocks with different colors in the test image are analyzed, so that the performance of the camera module can be obtained. The focusing marks arranged at the center positions of the color blocks improve the focusing efficiency of the camera module; and because a plurality of color lump arrays with focusing marks are arranged, the camera performance test card can use the same algorithm for testing camera modules with different specifications, and can realize the simultaneous test of a plurality of camera modules. Therefore, the testing effect, compatibility and testing efficiency of the camera performance testing card and the camera testing system using the camera performance testing card are improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present disclosure and together with the description, serve to explain the principles of the disclosure.
Fig. 1 is a schematic cross-sectional structure diagram of a camera performance test card in an exemplary embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a front structure of a camera performance test card according to an exemplary embodiment of the disclosure;
FIG. 3 is a diagram illustrating an exemplary structure of a focus mark according to an embodiment of the present disclosure;
FIG. 4 is a second schematic diagram illustrating a structure of a focus mark in an exemplary embodiment of the present disclosure;
FIG. 5 is a third schematic diagram illustrating a structure of a focus mark in an exemplary embodiment of the disclosure;
FIG. 6 is a fourth illustration of a focus mark in an exemplary embodiment of the disclosure;
FIG. 7 is a fifth exemplary illustration of a focus mark according to an exemplary embodiment of the disclosure;
FIG. 8 is a sixth schematic diagram illustrating a structure of a focus mark in an exemplary embodiment of the present disclosure;
FIG. 9 is a seventh illustration of a focus mark in an exemplary embodiment of the disclosure;
fig. 10 is a schematic structural diagram of a camera testing system in an exemplary embodiment of the present disclosure.
Detailed Description
Reference will now be made in detail to the exemplary embodiments, examples of which are illustrated in the accompanying drawings. When the following description refers to the accompanying drawings, like numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the exemplary embodiments below are not intended to represent all implementations consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.
Electronic products such as mobile phones generally include a camera module, and the camera module is required to pass a performance test before being applied to the products, so as to ensure that the camera module of the electronic device meets an expected shooting requirement.
The resolution of the imaging system is one of key indexes for evaluating the performance of the camera module, a user uses the camera module of the electronic device to take a picture, and the definition of the picture is the resolution of the camera module. The detection method for obtaining the resolving force may include: modulation Transfer Function (MTF) detection, Spatial Frequency Response (SFR) detection, and the like, the present disclosure takes SFR detection as an example, and exemplarily describes a camera performance detection card used in a test process and the test process.
When the imaging system analysis force test is carried out, the camera module to be tested shoots the camera performance test card to obtain a test image, and the test image is analyzed through a corresponding algorithm, so that the analysis force of the camera module to be tested is judged. However, due to the structural function limitation of the camera performance test card in the related art, the focusing difficulty of the camera module in the test shooting process and the synchronous test difficulty of the camera modules with different specifications are increased.
For example, when the camera performance test card only includes black and white blocks arranged in an array, different camera modules have different resolutions and different angles of view, and when the camera modules of different specifications share the same camera performance test card, the camera module with a small angle of view may have an inaccurate focusing phenomenon because there is not enough details in the field of view, so that it is difficult for the mistesting camera module to realize focusing in the shooting process, and the test result is affected. Or, a focusing mark is set at a central position of the camera performance test card, so that when the focusing mark is used to improve the focusing efficiency of the camera module, it is necessary to limit the lens optical axis of the camera module to correspond to the central position of the camera performance test card in the shooting process of the camera module, and to implement analysis of the camera module through an algorithm matched with the camera performance test card including the focusing mark. Under the condition that the test algorithm is not changed, the test of camera modules with various specifications cannot be realized due to the interference of the focusing marks on the test algorithm, and the simultaneous test of a plurality of camera modules cannot be realized through one camera performance test card.
Fig. 1 is a schematic cross-sectional structure diagram of a camera performance test card in an exemplary embodiment of the present disclosure;
fig. 2 is a schematic front structure diagram of a camera performance test card in an exemplary embodiment of the present disclosure. The camera performance test card 1 is used with the camera module 2 in a matched manner, as shown in fig. 1 and 2, the camera performance test card 1 comprises a plurality of color blocks 121 arranged in an array. The sides of the color blocks 121 are arranged obliquely relative to the horizontal reference X and the vertical reference Y of the camera performance test card 1, the colors of the adjacent color blocks 121 are different, and the center position of each color block 121 is provided with a focusing mark 122.
The camera performance test card 1 is provided with a plurality of color blocks 121 in an array, the sides of the color blocks 121 are inclined relative to the transverse reference X and the longitudinal reference Y of the camera performance test card 1, the center of each color block 121 is provided with a focusing mark 122, after the camera module 2 rapidly focuses and shoots the camera performance test card 1 based on the focusing mark 122 to obtain a test image, the inclined boundaries between the adjacent color blocks 121 with different colors in the test image are analyzed, and the performance of the camera module 2 can be obtained. The focusing mark 122 arranged at the center of each color block 121 improves the focusing efficiency of the camera module 2; due to the arrangement of the plurality of color blocks 121 with the focusing marks 122, the camera performance test card 1 can use the same algorithm for testing the camera modules 2 with different specifications, and can simultaneously test a plurality of camera modules 2. Therefore, the test effect, compatibility and test efficiency of the camera performance test card 1 and the camera test system using the camera performance test card 1 are improved.
In the above embodiment, the camera performance test card 1 includes the substrate layer 11 and the functional layer 12 disposed on the substrate layer 11, and the color block 121 is formed on the functional layer 12. The substrate layer 11 may be a film sheet, and the functional layer 12 may be a printed layer provided on the substrate layer 11. The film sheet may be transparent or have a predetermined transparency, which is not limited by the present disclosure. The functional layer 12 is directly printed on the film, so that the processing and manufacturing difficulty of the functional layer 12 is reduced, and the use convenience of the camera performance test card 1 is improved based on the overall lightness and thinness of the film and the printing layer.
Alternatively, the functional layer 12 may also be a nested structure or a filling structure assembled on the substrate layer 11, so as to enable the functional layer 12 to form a to-be-photographed plane including the color patches 121 in the distribution form, and the present disclosure does not limit the arrangement manner of the functional layer 12.
In one embodiment, the shape of the color block 121 is rectangular, and particularly, the color block 121 may further be square. In another embodiment, the plurality of colors 121 have the same size, and the plurality of color blocks 121 having the same size may be white blocks 121 and black blocks 121 alternately arranged to form a checkerboard-like structure. When the camera module 2 shoots the checkerboard-shaped color block 121 structure with alternate black and white, an image containing the black and white color block 121 and an inclined boundary between the black and white color block and the black and white color block can be obtained, and the inclined boundary is analyzed by using an SFR detection method, so that the analytic force of the camera module 2 can be obtained.
Alternatively, a plurality of color patches 121 with the same size may also be color patches 121 with different colors, which is not limited by the present disclosure. When the color blocks 121 are colored, the colored color blocks 121 can be processed into black and white blocks 121 which are alternately arranged by an image processing method, and the inclined boundary is analyzed by an SFR detection method, so that the resolving power of the camera module 2 can be obtained.
Further, the inclination angle α between one side of the color block 121 and the longitudinal reference Y of the camera performance test card 1 may range from 3 degrees to 10 degrees. For example, the inclination angle α between the side of the patch 121 and the longitudinal reference Y of the camera performance test card 1 is defined as 8 degrees to promote the convenience of the algorithmic analysis for the inclined boundary. Alternatively, The inclination angle α between The side of The color patch 121 and The longitudinal reference Y of The camera performance test card 1 may be other angles close to 5 degrees, for example, 4 degrees, 5 degrees, 6 degrees, etc., according to The ISO (International Organization for Standardization), which is not limited by The present disclosure.
In the above embodiment, the focusing mark 122 is used to assist the camera module 2 to achieve fast and accurate focusing, and the focusing mark 122 may be a line disposed in the center of each color block 121. It should be noted that the characteristic size of the line may have a preset ratio to the characteristic size of the color block 121. Taking the line as a straight line and the color block 121 as a square as an example, the characteristic size of the line may refer to the length of the line, the characteristic size of the color block 121 may refer to the side length of the color block 121, and the preset ratio between the length of the line and the side length of the color block 121 may be 1:1.5, 1:2, and the like. The preset ratio may be matched with the shape and size of the color block 121 and a test algorithm, and the disclosure does not limit the preset ratio.
Taking the functional layer 12 including the black and white blocks 121 alternately, the focus marks 122 in the black blocks 121 may be white lines, and the focus marks 122 in the white blocks 121 may be black lines. The black line and the white line as the focus mark 122 have the same structure and shape. The following takes the white block 121 and the black line in the white block 121 as an example, and exemplifies the setting manner of the focus mark 122:
in one embodiment, as shown in fig. 3, the focus mark 122 includes a first straight line 1221 and a second straight line 1222 crossing at the center of the patch 121, and one of the first straight line 1221 and the second straight line 1222 is at an angle of 45 degrees with respect to the lateral reference X of the camera performance test card 1, and the other is at an angle of-45 degrees with respect to the lateral reference X of the camera performance test card 1. Through the linear structure of the focusing mark 122 and the angle relationship between the first straight line 1221 and the second straight line 1222 and the horizontal reference X and the vertical reference Y of the camera performance test card 1, the focusing mark 122 can achieve the focusing assisting function, and interference caused by the focusing mark 122 can be removed in arithmetic operation for the inclined boundary of the color block 121, so as to improve the accuracy of the performance test of the camera module 2.
Further, the focusing mark 122 may also be a plurality of straight lines crossing and disposed at the center of the color block 121, and the disclosure does not limit the number of crossing branch lines.
In another embodiment, the lines may also enclose one of an unclosed circle, triangle, and rectangle, and the present disclosure does not limit the specific shape structure of the lines.
In the above embodiments, the line type of the line may be a continuous solid line and/or a plurality of line segments arranged intermittently. Taking the focusing mark 122 as a straight line crossed at the center of the color block 121 as an example, the straight line may be a continuous solid line type as shown in fig. 2 and fig. 3, may also be composed of a plurality of line segments arranged intermittently, and may also include a line type composed of a continuous solid line type and a line segment arranged intermittently. As shown in fig. 4, each of the two straight lines is formed by two line segments that are intermittently arranged, and a break point of the two line segments is located at the center of the color block 121. For example, as shown in fig. 5, one of the two straight lines is a continuous solid line, and the other line is composed of three line segments arranged intermittently, and the continuous solid line intersects with the middle one of the three line segments. For example, as shown in fig. 6, one of the two straight lines is a continuous solid line passing through the center of the color block 121, the other line is formed by two line segments arranged intermittently, and the break point of the two line segments is located at the center of the color block 121. For example, as shown in fig. 7, one of the two straight lines is a continuous solid line, and the other line is formed by two line segments that are intermittently arranged, and the continuous solid line intersects with an end point of any one of the two line segments at the center of the color block 121. Or, both the two straight lines are formed by a plurality of line segments arranged discontinuously, the break points of the plurality of line segments may be located at the center of the color block 121 shown in fig. 8, and the break points of the plurality of line segments may also be located at other positions of the color block 121 shown in fig. 9.
The present disclosure further provides a camera test system, as shown in fig. 10, the camera test system includes a test device, a camera module 2 and the camera performance test card 1. The camera module 2 is electrically connected with the test equipment, the camera module 2 is positioned above the camera performance test card 1, the transverse shooting direction of the camera module 2 corresponds to one of the transverse reference X and the longitudinal reference Y of the camera performance test card 1, and the longitudinal shooting direction of the camera module 2 corresponds to the other one of the transverse reference X and the longitudinal reference Y of the camera performance test card 1. Make camera module 2 no matter be along the horizontal benchmark X setting of camera capability test card 1, still set up the homoenergetic and satisfy the test position requirement along the vertical benchmark Y of camera capability test card 1, therefore promoted the position flexibility of camera module 2 in camera test system.
The camera performance test card 1 is provided with a plurality of color blocks 121, the sides of the color blocks 121 are inclined relative to the transverse reference X and the longitudinal reference Y of the camera performance test card 1, the center position of each color block 121 is provided with a focusing mark 122, after the camera module 2 rapidly focuses and shoots the camera performance test card 1 based on the focusing mark 122 to obtain a test image, the inclined boundaries between the adjacent color blocks 121 with different colors in the test image are analyzed, and the performance of the camera module 2 can be obtained. The focusing mark 122 arranged at the center of each color block 121 improves the focusing efficiency of the camera module 2; due to the arrangement of the plurality of color blocks 121 with the focusing marks 122, the camera performance test card 1 can use the same algorithm for testing the camera modules 2 with different specifications, and can simultaneously test a plurality of camera modules 2. Therefore, the testing effect, compatibility and testing efficiency of the camera performance testing card 1 and the camera testing system using the camera performance testing card 1 are improved, the number of testing devices can be reduced, production line operators are saved, and production line scale and testing time are reduced.
Further, camera test system can include a plurality of camera modules 2, and camera capability test card 1 cooperates and uses in a plurality of camera modules 2. The camera performance test card 1 is used for testing the plurality of camera modules 2, so that the number of the camera performance test cards 1 can be reduced, the reusability of the camera performance test card 1 is improved, and the test cost is reduced; on the other hand, can also promote camera module 2's efficiency of software testing. Particularly, when the camera module 2 containing various specifications of the same electronic device 3 is used, the test can be completed at one time, so that the test efficiency of the camera test system is increased.
It should be noted that the electronic device 3 may be a mobile phone, a tablet computer, a medical terminal, a vehicle-mounted terminal, and the like, and the disclosure is not limited thereto.
In addition, camera test system can also further include testboard 4 and light source module 5, and testboard 4 is in order to be used for fixed camera module 2 or electronic equipment 3, and light source module 5 sets up in testboard 4 top to the shooting process for camera module 2 provides supplementary light.
In the test process for the mobile phone cameras, a plurality of mobile phones can be fixed on the test bench 4, and the camera performance test card 1 is arranged below the mobile phones, so that the transverse shooting direction or the longitudinal shooting direction of each mobile phone camera corresponds to the transverse reference X of the camera performance test card 1. Then, a camera of the mobile phone is used for shooting the camera performance test card 1 to obtain a test image, and the test image is sent to the test equipment, so that the test equipment analyzes the test image by using a preset algorithm to obtain the resolving power of the mobile phone camera module 2.
Other embodiments of the disclosure will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure following, in general, the principles of the disclosure and including such departures from the present disclosure as come within known or customary practice within the art to which the disclosure pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the disclosure being indicated by the following claims.
It will be understood that the present disclosure is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.
Claims (13)
1. A camera performance test card is characterized in that the camera performance test card is matched with a camera module for use, and comprises a plurality of color blocks arranged in an array; the sides of the color blocks are obliquely arranged relative to the transverse datum and the longitudinal datum of the camera performance test card, the colors of the adjacent color blocks are different, and a focusing mark is arranged at the center position of each color block.
2. The camera performance test card of claim 1, wherein the shape of the color block is rectangular.
3. The camera performance test card of claim 1, wherein the plurality of color patches are the same size.
4. The camera performance test card of claim 1, wherein the plurality of color blocks comprise alternately arranged white color blocks and black color blocks.
5. The camera performance test card of claim 1, wherein an angle of inclination between an edge of the color block and a longitudinal reference of the camera performance test card comprises 3-10 degrees.
6. The camera performance test card of claim 1, wherein the focus mark comprises a line disposed in the center of the color block, and a preset ratio exists between the characteristic dimension of the line and the characteristic dimension of the color block.
7. The camera performance test card of claim 6, wherein the focus mark comprises a first line and a second line intersecting the center of the color block, and one of the first line and the second line is at an angle of 45 degrees with respect to a lateral reference of the camera performance test card, and the other line is at an angle of-45 degrees with respect to the lateral reference of the camera performance test card.
8. The camera performance test card of claim 6, wherein the line comprises a continuous solid line and/or a plurality of line segments arranged intermittently.
9. The camera performance test card of claim 6, wherein the lines enclose one of an unclosed circle, triangle, and rectangle.
10. The camera performance test card of claim 1, wherein the camera performance test card comprises a substrate layer and a functional layer disposed on the substrate layer, and the color block is formed on the functional layer.
11. The camera performance test card of claim 10, wherein the substrate layer is a film and the functional layer is a printed layer disposed on the substrate layer.
12. A camera test system, comprising a test device, a camera module and a camera performance test card according to any one of claims 1 to 11, wherein the camera module is electrically connected with the test device; the camera module is located camera performance test card top, just the horizontal direction of shooing of camera module corresponds to one in the horizontal benchmark of camera performance test card and the vertical benchmark, the vertical direction of shooing of camera module corresponds to another in the horizontal benchmark of camera performance test card and the vertical benchmark.
13. The camera test system of claim 12, wherein the camera test system comprises a plurality of camera modules, and the camera performance test card is coupled to the plurality of camera modules.
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| TWI775640B (en) * | 2021-09-18 | 2022-08-21 | 新煒科技有限公司 | Resolving power test card for camera module |
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| CN112887704B (en) | 2023-08-04 |
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