Test graphic card
By designing test charts with array distribution, the problems of complex testing process and image clarity differences of array camera modules were solved, and high-precision calibration and testing of array camera modules were achieved.
Patent Information
- Application Number
- CN202423123874.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-18
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2034-12-18
AI Technical Summary
In existing technologies, the testing process for array camera modules is complex and the differences in image clarity lead to chaotic calibration results. Traditional test charts cannot meet the testing requirements of array camera modules.
A test chart was designed, which includes a rectangular test surface and an array of test units. The test units are equipped with feature markers that overlap in different fields of view. Thick feature lines are added to ensure the focus consistency and stitching accuracy of the camera module.
By adopting a unified test unit design and feature marking overlap scheme, the calibration accuracy of the array camera module was improved, avoiding differences in image clarity and splicing effects, and ensuring the parallelism and spacing consistency of the array camera module.
Smart Images
Figure CN223540612U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of camera module testing technology, specifically to a test chart. Background Technology
[0002] With the development of technology, people have increasingly higher requirements for the camera functions of portable electronic devices. Against this backdrop, the demand for circuit board defect detection in electronic devices is also growing.
[0003] For circuit board inspection, camera modules are typically used for photographic inspection. However, with the increasing size of circuit boards and the growing number of electronic components, conventional single-camera module inspection solutions are no longer suitable. This has led to the development of array camera modules for inspection. As the name suggests, an array camera module consists of two or more camera modules that work together to achieve various superior functions. Before deployment, each camera module in the array camera module must be tested to calibrate or align it based on the test results. Due to various reasons, the testing process for array camera modules is more complex and difficult than that for single-camera modules.
[0004] However, for the calibration of array camera modules, traditional test charts cause differences in the image clarity of each camera module in the array camera module, which leads to chaotic image stitching and affects the calibration results of the array camera module.
[0005] Therefore, there is an urgent need for a test chart suitable for testing array camera modules. Utility Model Content
[0006] The purpose of this utility model is to at least solve one of the technical problems existing in the prior art. This utility model provides a test chart for testing array camera modules, including: a rectangular test surface, the rectangular test surface including a horizontal reference line, a vertical reference line, and a plurality of test units distributed in an array; the test unit is rectangular and a feature mark is provided in the test unit; the diagonal of the test unit is the full field of view that a single camera module can capture, and the test unit is provided with four feature marks on both the 0.5 field of view and the 0.92 field of view; wherein, along the direction of the horizontal reference line, the feature marks of adjacent test units on the 0.92 field of view overlap; along the direction of the vertical reference line, the feature marks of adjacent test units on the 0.5 field of view and the 0.92 field of view overlap.
[0007] According to one embodiment of this application, the test unit includes a center point, on which the feature marker is disposed.
[0008] According to one embodiment of this application, the four feature marks of the test unit on the 0.5 field of view are evenly distributed around the center point on the two center lines of the test unit.
[0009] According to one embodiment of this application, the four feature markers of the test unit in the 0.92 field of view are evenly distributed around the center point at the four corners of the test unit.
[0010] According to one embodiment of this application, the test unit is further provided with four uniformly distributed feature marks in a 0.7 field of view, wherein a single feature mark in the 0.7 field of view is located between the feature marks in the adjacent 0.5 field of view and the feature marks in the 0.92 field of view.
[0011] According to one embodiment of this application, the test unit is further provided with a thickened feature line, which is positioned toward the center point.
[0012] According to one embodiment of this application, the thickened feature lines include four lines, wherein two of the thickened feature lines are parallel to the long side of the test unit, and the other two thickened feature lines are parallel to the wide side of the test unit.
[0013] According to one embodiment of this application, the feature mark is circular, and the feature mark is divided into four alternating white and black blocks by two dividing lines passing through the center of the circle.
[0014] According to one embodiment of this application, the first dividing line in the dividing line forms an angle of 8° with the long side of the test unit, and the second dividing line in the dividing line forms an angle of 8° with the wide side of the test unit.
[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) By designing a unified test unit, the individual camera modules in the array camera module can be focused and tested, ensuring the consistency of the resolution of all camera modules; and the multiple test units are arrayed into a whole rectangular test surface to ensure that the spacing and parallel relationship of adjacent individual camera modules of the array camera module to be tested are consistent, avoiding the overlapping of feature marks on adjacent test units, and thus avoiding the difference in the clarity of the image edges of the test unit captured by a single camera module, which would affect the stitching and make the array camera module untestable. (2) By designing the feature marks of adjacent test units to overlap in the 0.5 field of view and the 0.92 field of view, making them the common points of the overlapping area of adjacent test units, the overlapping of feature marks of adjacent test units in the overlapping area is avoided, avoiding the difference in the clarity of the image captured by a single camera module of the test unit, which would affect the stitching of the image captured by the array camera module, and improving the calibration accuracy of the array camera module by the test chart. (3) Adding thick feature lines pointing to the center point and parallel to the long or wide side of the test unit in the test unit avoids the test unit in the rectangular test surface from being offset and rotated, and also avoids the rectangular test surface from having gaps, ensuring that the adjacent camera modules are arranged at equal intervals and in parallel during the assembly of the array camera module. Attached Figure Description
[0016] Figure 1 This is a schematic diagram of the structure of the test chart provided by this utility model;
[0017] Figure 2 A schematic diagram of the structure of a single test unit in the test chart provided by this utility model;
[0018] Figure 3 This is a structural schematic diagram of three adjacent test units in the test chart provided by this utility model;
[0019] Figure 4 A schematic diagram of the feature markings provided by this utility model. Detailed Implementation
[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.
[0021] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.
[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.
[0023] Please see Figure 1 As shown, in this specific embodiment, a test chart is provided, including a rectangular test surface 10. The rectangular test surface 10 includes a horizontal reference line 11, a vertical reference line 12, and multiple test units 20 arranged in an array. Each test unit 20 is a single test area on the rectangular test surface 10, and each test unit 20 performs calibration testing on a single camera module. It should be noted that the test chart of this application is mainly for the calibration testing of array camera modules, that is, calibrating individual camera modules to form an array camera module. It is necessary to ensure that the parallelism and tilt of the individual camera modules are consistent, thereby ensuring that each individual camera module in the array camera module can focus on the same object distance. The array camera module includes multiple camera modules, and each camera module corresponds to a single test unit 20. Therefore, multiple test units 20 need to be set on the rectangular test surface 10 to achieve the calibration testing of the array camera module. Thus, when the array camera module calibrated by the test chart of this application is used to inspect circuit boards, it can clearly identify the status of components at the same height on the entire circuit board, thereby improving the testing accuracy of the array camera module.
[0024] Please refer to Figure 2 As shown, Figure 2A schematic diagram of a single test unit 20 is provided, along with partial field-of-view markings on the test unit 20. The test unit 20 is rectangular, and its diagonal is the diameter of the full field of view that a single camera module can capture, i.e., a complete field of view. Since the field of view of the camera module is circular, the field of view of the test unit 20 is a circle centered at its center point 21. Therefore, the circle with its diagonal as its diameter is the maximum test field of view of the test unit. In simpler terms, the diameter of the image captured by a single camera module on the test chart is the diagonal of the test unit 20. For ease of understanding, as shown below... Figure 2 The center point of the test unit 20 is point A, and the 0.5, 0.7, and 0.92 fields of view of the test unit 20 are respectively... Figure 2 The test unit 20 is defined by three concentric circles B, C, and D, all centered at point A. Field of view B is defined as follows: 0.5 field of view B has a diameter centered at point A, with a diameter-to-diagonal ratio of 0.5; field of view C has a diameter centered at point A, with a diameter-to-diagonal ratio of 0.7; and field of view D has a diameter centered at point A, with a diameter-to-diagonal ratio of 0.92. Furthermore, feature markers 30 are provided within the test unit 20, with four feature markers 30 on both the 0.5 field of view B and the 0.92 field of view D.
[0025] like Figure 3 As shown, Figure 3 Selected Figure 1 The three adjacent test units 20 in the upper left corner of the test chart. Along the transverse baseline 11 ( Figure 3 In the X direction, the feature marks 30 of adjacent test units 20 on the 0.92 field of view D coincide; and along the longitudinal reference line 12 ( Figure 3 In the Y direction, the feature markers 30 of adjacent test units 20 overlap in the 0.5 field of view B and the 0.92 field of view D. For ease of understanding, as shown below... Figure 3 As mentioned above, test unit 20a ( Figure 3 (red dashed box in the middle) and test unit 20b ( Figure 3 The two feature markers 30 (within the purple dashed box) overlap on the 0.92 field of view D. Test unit 1 20a and test unit 3 20c ( Figure 3 The two feature marks 30 (within the blue dashed box) overlap in the 0.5 field of view B and in the 0.92 field of view D. By designing the feature marks 30 of adjacent test units 20 to overlap in the 0.5 field of view B and the 0.92 field of view D, they are made to form overlapping areas between adjacent test units 20 (e.g., ...). Figure 3The shared points (where the dashed boxes of different colors overlap) avoid the overlapping of feature marks 30 in the overlapping areas of adjacent test units 20, thereby avoiding the difference in the clarity of the image edges of test units 20 captured by a single camera module, which would affect the stitching of images captured by the array camera module and improve the calibration accuracy of the array camera module by the test chart.
[0026] In one embodiment, a feature mark 30 is provided on the center point A of the test unit 20 to facilitate precise positioning of the test unit 20.
[0027] like Figure 2 As shown, preferably, the four feature marks 30 of the test unit 20 in the 0.5 field of view B are evenly distributed around the center point on the two center lines of the test unit 20. It should be noted that one center line is a line passing through the center point and parallel to the long side of the test unit 20, and the other center line is a line passing through the center point and parallel to the wide side of the test unit 20. It can be understood that the test unit 20 is rectangular; therefore, the long side of the test unit 20 is the side containing the length of the rectangle, and the wide side of the test unit 20 is the side containing the width of the rectangle. Preferably, the long side of the test unit 20 is parallel to the horizontal reference line 11, and the wide side of the test unit 20 is parallel to the vertical reference line 12.
[0028] Please refer to this again. Figure 2 Preferably, the four feature marks 30 of the test unit 20 on the 0.92 field of view D are evenly distributed around the center point at the four corners near the test unit 20. Distributing the feature marks 30 of the test unit 20 on the 0.92 field of view D to the four corners facilitates the overlap of the feature marks 30 of adjacent test units 20 on the 0.92 field of view D, reduces the spacing between identical test units 20, and ensures that a single camera module can capture the completed test unit 20.
[0029] Please refer to this again. Figure 2 Preferably, the test unit 20 also has four evenly distributed feature markers 30 on a 0.7 field of view C, wherein a single feature marker 30 on the 0.7 field of view C is located between a feature marker 30 on a nearby 0.7 field of view C and a feature marker 30 on a 0.92 field of view D. To ensure that the distribution of feature markers 30 on the test unit 20 is as dispersed as possible, feature markers 30 are added between adjacent feature markers 30 on a 0.5 field of view B and feature markers 30 on a 0.92 field of view D.
[0030] In one embodiment, the test unit 20 is further provided with thickened feature lines 40, which are oriented towards the center point. Preferably, there are four thickened feature lines 40, two of which are parallel to the long side of the test unit 20, and the other two are parallel to the wide side of the test unit 20. Adding thickened feature lines 40 pointing towards the center point and parallel to the long or wide side of the test unit 20 to the test unit 20 avoids offset and rotation of the test unit 20 in the rectangular test surface 10, and also avoids gaps in the rectangular test surface 10, ensuring that adjacent camera modules are arranged at equal intervals and in parallel during assembly.
[0031] like Figure 4 As shown, in one embodiment, the feature mark 30 is circular, and the feature mark 30 is divided into four alternately arranged white blocks 32 and black blocks 33 by two dividing lines passing through the center of the circle.
[0032] In one embodiment, the angle U between the first dividing line 311 and the long side of the test unit 20 is 8°, and the angle H between the second dividing line 312 and the wide side of the test unit 20 is 8°.
[0033] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.
Claims
1. A test chart for testing array camera modules, characterized in that, include: A rectangular test surface, comprising a horizontal reference line, a vertical reference line, and multiple test units arranged in an array; The test unit is rectangular and has feature markers inside it; The diagonal of the test unit represents the complete field of view that the test unit provides to a single camera module, and the test unit has four feature markers on both the 0.5 field of view and the 0.92 field of view. Wherein, along the direction of the lateral baseline, the feature marks of adjacent test units in the 0.92 field of view partially overlap; Along the longitudinal baseline, the feature marks of adjacent test units on the 0.5 field of view and the 0.92 field of view partially overlap.
2. The test chart according to claim 1, characterized in that, The test unit includes a center point, on which a feature marker is disposed.
3. The test chart according to claim 2, characterized in that, The four feature markers of the test unit in the 0.5 field of view are evenly distributed around the center point on the two center lines of the test unit.
4. The test chart according to claim 3, characterized in that, The four feature markers of the test unit are evenly distributed around the center point at the four corners of the test unit.
5. The test chart according to claim 4, characterized in that, The test unit also has four evenly distributed feature markers in a 0.7 field of view, wherein each feature marker in the 0.7 field of view is located between the feature markers in the adjacent 0.5 field of view and the feature markers in the 0.92 field of view.
6. The test chart according to claim 5, characterized in that, The test unit is also provided with a thickened feature line, which is oriented toward the center point.
7. The test chart according to claim 6, characterized in that, The thickened feature lines include four lines, two of which are parallel to the long side of the test unit, and the other two are parallel to the wide side of the test unit.
8. The test chart according to claim 1, characterized in that, The feature marker is circular, and the feature marker is divided into four alternating white and black blocks by two dividing lines passing through the center of the circle.
9. The test chart according to claim 8, characterized in that, The first dividing line of the dividing line forms an angle of 8° with the long side of the test unit, and the second dividing line of the dividing line forms an angle of 8° with the wide side of the test unit.