Camera testing device

Abstract

The utility model discloses a camera testing device. The camera testing device comprises a testing graphic card, a light source, a rotating module and a control module, the testing graphic card is fixed on the rotating module, and the light source and the rotating module are both connected with the control module; the light-emitting surface of the light source faces the test graphic card, and an illumination light beam emitted by the light source enters the test graphic card; the test graphic card is arranged in a view field range of the to-be-tested camera, and the to-be-tested camera collects an image of the test graphic card; the control module controls the rotating module to drive the test graphic card to rotate at a preset rotating speed. According to the camera testing device provided by the utility model, the illumination intensity of the light source and the rotating speed of the testing graphic card are adjusted through the control module, and data of the camera to be tested under different illumination intensities and different rotating speeds of the testing graphic card can be automatically acquired, so that the performance of the camera to be tested can be automatically, efficiently and stably tested.

Description

Technical Field

[0001] This utility model relates to the field of image sensor testing technology, and in particular to a camera testing device. Background Technology

[0002] An event camera, or event-based vision sensor (EVS), is a novel type of image sensor that operates in a completely different way from traditional cameras. Instead of outputting image frames at a constant rate, an EVS records pixel-level brightness changes in real time. When these pixel-level brightness changes exceed a set threshold (defined as an event occurring), the EVS timestamps the event and outputs an event stream. Compared to traditional cameras, EVS offers advantages such as low data rate, low power consumption, low latency, and high dynamic range.

[0003] Performance testing of EVS is crucial for ensuring its performance in various application scenarios. By conducting performance tests on EVS, its performance can be evaluated and optimized to meet user shooting needs in high-speed, dynamic, and low-light scenes. However, current EVS performance testing requires the collection of large amounts of data. There is an urgent need for an automated, efficient, and stable EVS performance evaluation device to solve the repetitive, tedious, mechanical, and error-prone operations of manual image acquisition, thereby improving work efficiency, reducing labor costs, and enabling mass production of such a testing device. Utility Model Content

[0004] This invention provides a camera testing device that, through a control module, adjusts the light intensity of the light source and the rotation speed of the test chart, and can automatically collect data of the camera under test under different light intensities and different test chart rotation speeds, thereby enabling automatic, efficient, and stable performance testing of the camera under test.

[0005] According to one aspect of the present invention, a camera testing device is provided, comprising a test pattern card, a light source, a rotation module, and a control module, wherein the test pattern card is fixed on the rotation module, and both the light source and the rotation module are connected to the control module;

[0006] The light-emitting surface of the light source faces the test chart, and the illumination beam emitted by the light source is incident on the test chart;

[0007] The test chart is set within the field of view of the camera under test, and the camera under test acquires images from the test chart.

[0008] The control module controls the rotation module to drive the test chart to rotate at a preset speed.

[0009] Optionally, the camera testing device further comprises a storage module, a data input end of the storage module being connected with a data output end of the camera to be tested.

[0010] Optionally, the center of the test chart is located on the optical axis of the camera to be tested.

[0011] Optionally, the light source comprises a first light source and a second light source, the first light source and the second light source being symmetrically arranged on two sides of the optical axis of the camera to be tested.

[0012] Optionally, the first light source and the second light source are both surface light sources.

[0013] Optionally, the rotating module comprises a motor, the control module controlling the motor to rotate and drive the test chart to rotate.

[0014] Optionally, the rotating speed of the motor is adjustable.

[0015] Optionally, the camera testing device further comprises a camera bearing module, the camera to be tested being fixed on the camera bearing module, the camera bearing module being connected with the control module, the control module controlling the camera bearing module to drive the camera to be tested to move along a first direction, the first direction being perpendicular to the plane on which the test chart is located.

[0016] Optionally, the camera testing device further comprises a slide rail, the camera bearing module being arranged on the slide rail.

[0017] Optionally, the camera bearing module comprises at least two bearing positions, each bearing position bearing one camera to be tested.

[0018] The camera testing device provided by the embodiment of the utility model, comprising test chart, light source, rotating module and control module, test chart is fixed on rotating module, light source and rotating module all are connected with control module. Through setting the light emitting surface of light source faces test chart, the illumination beam of light source emission is incident to test chart, and the illumination intensity of light source can be adjusted under the control of control module, rotating module drives test chart to rotate under the control of control module; Through setting test chart in the field of view range of camera to be tested, camera to be tested gathers the image of test chart, realizes the data under different illumination intensity and different test chart rotating speed of camera to be tested can be gathered automatically, thereby can automatically, efficiently and stably test the performance of camera to be tested.

[0019] It should be understood that the content described in this part is not intended to identify the key or important features of the embodiments of the utility model, nor is it used to limit the scope of the utility model. Other features of the utility model will become easy to understand through the following description. BRIEF DESCRIPTION OF DRAWINGS

[0020] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0021] Figure 1 A structural block diagram of a camera test device provided by the embodiment of the present application is shown in the figure.

[0022] Figure 2 A structural block diagram of another camera test device provided by the embodiment of the present application is shown in the figure.

[0023] Figure 3 A structural schematic diagram of a camera test device provided by the embodiment of the present application is shown in the figure.

[0024] Figure 4 A test flow schematic diagram of the camera test device provided by the embodiment of the present application in a test scene is shown in the figure. DETAILED DESCRIPTION

[0025] In order to make the technical scheme in the embodiments of the present application clearer, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of these drawings.

[0026] It should be noted that the terms "first", "second", and the like in the description of the present application and the above drawings are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0027] The research shows that the current EVS performance test needs to collect a large amount of data, and an automatic, efficient and stable EVS performance evaluation device is urgently needed to solve the repeated, tedious, mechanical and error-prone operation in manual image acquisition, improve work efficiency, reduce labor cost, and realize the test device of batch production.

[0028] Based on this, the utility model embodiment proposes a camera testing device, which can be used to test EVS, and is provided with a test card, a light source, a rotating module and a control module. The test card is arranged in the field of view range of the camera to be tested, the light source is used to provide an illumination beam for the camera to be tested, and the control module is used to adjust the light intensity of the light source, the rotating speed of the rotating module driving the test card to rotate and the parameters of the camera to be tested, so as to quantitatively analyze the performance of the camera to be tested based on the data obtained by the camera to be tested. Therefore, the utility model adjusts the light intensity of the light source and the rotating speed of the test card through the control module, can automatically collect the data of the camera to be tested under different light intensities and different rotating speeds of the test card, and can automatically, efficiently and stably test the performance of the camera to be tested, solve the repeated, tedious, mechanical and error-prone operation in manual image acquisition, improve the work efficiency, reduce the labor cost, and realize the test scene of batch production.

[0029] The above is the core idea of the utility model, and the specific embodiments of the utility model will be explained below with reference to the drawings. Figure 1 The utility model provides a kind of structure block diagram of camera testing device for the embodiment of the utility model, reference Figure 1 The camera testing device includes test card 10, light source 20, rotating module 30 and control module 40, test card 10 is fixed on rotating module 30, and light source 20 and rotating module 30 are connected with control module 40;The light exit surface of light source 20 faces test card 10, and the illumination beam emitted by light source 20 is incident to test card 10;Test card 10 is arranged in the field of view range of the camera to be tested 50, and the camera to be tested 50 collects the image of test card 10;Control module 40 controls rotating module 30 to drive test card 10 to rotate at a preset rotating speed.

[0030] The camera to be tested can be an event camera EVS, and it can be understood that the event camera is a sensor based on visual perception, and unlike a traditional camera, it does not capture images of the entire scene at fixed time intervals, but only outputs data when changes in the scene are detected. This working principle makes the event camera have significant advantages in dynamic scene capture and high-speed motion detection. The working principle of the event camera is based on the photoelectric effect. When the brightness of a pixel point exceeds a certain threshold, an event is triggered. The event records the difference between the brightness of the pixel point before and after the event and the timestamp of the event. Therefore, when the test card 10 rotates, the light intensity of the light received by the pixels of the event camera to be tested will change, that is, an event response will be generated. In other embodiments, the camera to be tested can also be an active pixel sensor (Active Pixel Sensor, APS), such as a CMOS (Complementary Metal Oxide Semiconductor) sensor, to realize the related function test of the APS. In the following embodiments, EVS is taken as an example for description. The test card 10 can be designed with a preset test shape. In actual implementation, the shape and specific form of the test card 10 can be selected according to actual conditions, and the test card 10 can be replaced according to actual test scenes, and the embodiments of the present application do not limit this. The light source 20 is used to provide an illumination beam. The type of the light source 20 can be selected according to actual conditions, for example, a light-emitting diode. The brightness of the light source 20 can be adjusted under the control of the control module 40. The rotating module 30 can include a motor, and the control module 40 controls the motor to rotate and drive the test card 10 to rotate. Optionally, the speed of the motor can be adjusted to adjust the rotation speed of the test card 10.

[0031] Exemplarily, the embodiments of the present application can quantitatively calibrate the restoration capability of the event camera to be tested for test cards with different rotation speeds (equivalent to different degrees of blurring) and the image quality under the same light intensity by adjusting the light intensity of the light source and the rotation speed of the test card through the control module. The image quality includes deblurring degree, image signal-to-noise ratio (SNR), such as uniform color block SNR, and the deblurring capability of the event camera to be tested under different brightness under different light intensities, and further the minimum brightness for realizing a specific deblurring degree can be determined.

[0032] It should be noted that the embodiments of the present application can test the subjective performance of the event camera to be tested, and the test results can be further used for alignment with the objective performance.

[0033] Figure 2 Another camera test device provided by the embodiments of the present application is shown in the structure block diagram,Figure 2 Optionally, the camera testing device further comprises a storage module 60, a data input end of the storage module 60 is connected with a data output end of the camera under test 50.

[0034] By arranging the storage module 60, the storage module 60 can store the data output by the camera under test 50, so as to quantitatively analyze the performance of the camera under test 50 based on the data.

[0035] Figure 3 A structural schematic diagram of a camera testing device provided by the utility model is shown in Figure 3 Optionally, the center of the test chart 10 is located on the optical axis of the camera under test 50, that is, the center of the test chart is directly opposite the lens of the camera under test 50, so as to realize the collection of the center of the test chart 10 by the camera under test 50.

[0036] It can be understood that Figure 3 The structure of the storage module and the control module is not shown in the figure. The field of view of the camera under test 50 is FOV, and the shooting distance is D.

[0037] Optionally, continuing to refer to Figure 3 The light source 20 comprises a first light source 21 and a second light source 22, and the first light source 21 and the second light source 22 are symmetrically arranged on both sides of the optical axis of the camera under test 50.

[0038] By arranging the light source 20 to comprise the first light source 21 and the second light source 22, the first light source 21 and the second light source 22 are symmetrically arranged on both sides of the test chart 10 with the center line of the camera under test and the test chart 10 as the axis, that is, the optical axis of the camera under test 50. The light emitted by the first light source 21 and the second light source 22 faces the test chart 10 and is reflected on the test chart 10 to the camera under test 50. Through the above arrangement, the light provided by the light source 20 for the shooting of the camera under test 50 is more uniform, thereby providing a better test environment.

[0039] Optionally, the first light source 21 and the second light source 22 are both surface light sources, which can provide a better test environment and test effect.

[0040] In an embodiment, optionally, the camera testing device can further comprise a camera bearing module, the camera under test is fixed on the camera bearing module, the camera bearing module is connected with the control module, and the control module controls the camera bearing module to drive the camera under test to move along a first direction, and the first direction is perpendicular to the plane where the test chart is located.

[0041] By arranging the camera bearing module to drive the camera under test to move, the distance between the camera under test and the test chart can be adjusted, which is suitable for more application scenarios.

[0042] In an embodiment, the camera testing device further comprises a slide rail, the camera carrying module is arranged on the slide rail, the slide rail is perpendicular to the plane where the test chart is arranged, and the slide rail is used for adjusting the distance between the camera carrying module, the to-be-tested event camera arranged on the camera carrying module and the test chart, so that the field of view of the to-be-tested event camera is guaranteed to be aligned with the framing boundary frame on the backboard, and the reliability of the test result is improved.

[0043] In an embodiment, the camera carrying module comprises at least two carrying positions, and each carrying position carries one to-be-tested event camera.

[0044] Figure 4 A test flowchart in a test scene of the camera testing device is provided in the embodiment of the utility model. Referring to Figure 4 , first, a set of test conditions are set by the control module based on preset test parameters, the parameters of the to-be-tested event camera, the illumination intensity of the light source and the rotating speed of the test chart; after confirming that the parameter setting of the to-be-tested event camera is completed, the illumination intensity setting of the light source is completed (which can be confirmed by an illuminometer) and the rotating speed setting of the test chart is completed, the storage module collects and stores the data output by the to-be-tested event camera, then the next set of test conditions are set by the control module based on the preset test parameters, and the above steps are repeated. Finally, the data output by the to-be-tested event camera under all test conditions contained in the preset test parameters are stored in the storage module of the camera testing device provided in the embodiment of the utility model, so as to be used for evaluating and analyzing the various performances of the to-be-tested event camera.

[0045] In the above embodiments, the description of each embodiment has its own focus, and the parts not described in detail in an embodiment can be referred to the relevant description of other embodiments.

[0046] The above specific embodiments do not constitute a limitation on the protection scope of the utility model. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A camera testing device, characterized in that, It includes a test chart, a light source, a rotation module, and a control module. The test chart is fixed on the rotation module, and both the light source and the rotation module are connected to the control module. The light-emitting surface of the light source faces the test chart, and the illumination beam emitted by the light source is incident on the test chart; The test chart is set within the field of view of the camera under test, and the camera under test acquires images from the test chart. The control module controls the rotation module to drive the test chart to rotate at a preset speed.

2. The camera testing apparatus according to claim 1, characterized in that, It also includes a storage module, the data input terminal of which is connected to the data output terminal of the camera under test.

3. The camera testing apparatus according to claim 1, characterized in that, The center of the test chart is located on the optical axis of the camera under test.

4. The camera testing apparatus according to claim 3, characterized in that, The light source includes a first light source and a second light source, which are symmetrically arranged on both sides of the optical axis of the camera under test.

5. The camera testing apparatus according to claim 4, characterized in that, Both the first light source and the second light source are surface light sources.

6. The camera testing apparatus according to claim 1, characterized in that, The rotation module includes a motor, and the control module controls the motor to rotate, thereby causing the test chart to rotate.

7. The camera testing apparatus according to claim 6, characterized in that, The motor's speed is adjustable.

8. The camera testing apparatus according to claim 1, characterized in that, It also includes a camera carrier module, on which the camera under test is fixed. The camera carrier module is connected to the control module, and the control module controls the camera carrier module to move the camera under test along a first direction, which is perpendicular to the plane of the test chart.

9. The camera testing apparatus according to claim 8, characterized in that, It also includes a slide rail, on which the camera-carrying module is mounted.

10. The camera testing apparatus according to claim 8, characterized in that, The camera carrier module includes at least two carrier positions, each of which carries one camera under test.

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