Device for testing exposure time of camera equipment

Abstract

The embodiment of the present invention provides a device for testing the exposure time of a camera device, comprising: a turntable with a motor, a pointer fixed at the center of the turntable, a 360-degree angle scale set on the periphery of one side of the turntable on which the pointer is fixed, and the center of the 360-degree angle scale is concentric with the center of the turntable; when testing the exposure time of the camera device, the motor is started, and after the motor drives the turntable to rotate according to a predetermined speed of the motor, the camera device captures image data including the pointer, the turntable and the angle scale, so as to determine the exposure time of the camera device according to the fan-shaped trailing angle of the pointer captured in the image data. The test device has a simple layout when conducting a test, high exposure time detection technology precision, high flexibility, simplicity, low difficulty in system construction, easy and convenient maintenance, and easy replacement of parts to be repaired.

Description

Technical Field

[0001] The invention relates to the field of photography, and in particular to a device for testing the exposure time of photography equipment. Background Art

[0002] In the field of video recording, video recording equipment detects the brightness of the actual shooting scene and automatically controls the exposure length of the photosensitive element through an algorithm. If the actual exposure length of the photosensitive element is detected, detection tools and methods are needed to detect and confirm the exposure time of the video recording equipment. During the debugging of the automatic exposure algorithm and the comparison of the exposure time of multiple video recording equipment, the exposure time needs to be tested and confirmed.

[0003] Among the existing exposure time detection technologies, one technology is to use an LED array to light up the LEDs on the array one by one, and the camera device takes an image of the LED array. By checking the number of LEDs that are photographed to be lit in the image and combining the frequency of the LED lighting, the exposure time of the camera device is calculated. Another technology is to use two sets of rotating reflectors to project light from a point light source onto a reflective plate, and by combining the number of bright lines on the reflective plate imaged by the imaging device and the rotation speed of the reflector, the exposure time of the camera device is calculated. The existing exposure time detection technology has too low accuracy, poor flexibility, complex equipment, and difficulty in setting up the equipment. In addition, the method is too simple and the accuracy is low. Summary of the invention

[0004] The embodiment of the present invention provides a device for testing the exposure time of a camera device, which is used to improve the accuracy and flexibility of the exposure time detection technology.

[0005] An embodiment of the present invention provides an apparatus for testing the exposure time of a camera device, comprising: a turntable with a motor, a pointer fixed at the center of the turntable, a 360-degree angle scale arranged on the periphery of one side of the turntable on which the pointer is fixed, and a center of the 360-degree angle scale being concentric with a center of the turntable; when testing the exposure time of the camera device, the motor is started, and after the turntable is driven by the motor to rotate according to a predetermined rotation speed of the motor, the camera device captures image data including the pointer, the turntable and the angle scale, so as to determine the exposure time of the camera device according to the fan-shaped trailing angle of the pointer captured in the image data.

[0006] Optionally, the device further comprises a turntable cover, the 360-degree angle scale being arranged on the outer circumference of the turntable cover, and the turntable is covered with the turntable cover so as to fix the 360-degree angle scale on the outer circumference of one side of the turntable on which the pointer is fixed.

[0007] Optionally, the device further comprises an angle scale fixing member, and the 360-degree angle scale is fixedly connected to the periphery of a side of the turntable on which the pointer is fixed via the angle scale fixing member.

[0008] Optionally, the motor is a constant speed rotating motor, and the rotating shaft of the motor is installed correspondingly at the center of the turntable.

[0009] Optionally, the motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped shadow angle is less than 180 degrees, the speed of the motor is increased to a first target speed. The first target speed is the speed when the fan-shaped shadow angle of the pointer in the image data captured by the camera device after the motor speed is increased is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device based on the fan-shaped shadow angle of the pointer in the image data captured by the camera device when the motor is operating at the first target speed.

[0010] Optionally, the motor is a constant speed rotating motor with adjustable speed. When the fan-shaped shadow angle is greater than 360 degrees, the speed of the motor is reduced to a second target speed. The second target speed is the speed when the fan-shaped shadow angle of the pointer in the image data captured by the camera device after the motor is reduced in speed is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device based on the fan-shaped shadow angle of the pointer in the image data captured by the camera device when the motor is operating at the second target speed.

[0011] Optionally, the motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped drag angle is less than 180 degrees, the speed of the motor is increased to multiple third target speeds, each of the third target speeds being the speed when the fan-shaped drag angle of the pointer in the image data captured by the camera device after the motor is increased in speed. The exposure time of the camera device is determined according to each fan-shaped drag angle of the pointer in each image data captured by the camera device when the motor is working at each third target speed, so as to obtain multiple exposure times corresponding to all third target speeds, and the average exposure time is determined by using the average algorithm for the multiple exposure times as the standard exposure time of the camera device.

[0012] Optionally, at least half of all the third target rotational speed sets are different target rotational speeds.

[0013] Optionally, the motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped drag angle is greater than 360 degrees, the speed of the motor is reduced to multiple fourth target speeds, each of the fourth target speeds being the speed when the fan-shaped drag angle of the pointer in the image data captured by the camera device after the motor is reduced in speed. The exposure time of the camera device is determined according to each fan-shaped drag angle of the pointer in each image data captured by the camera device when the motor works at each fourth target speed, so as to obtain multiple exposure times corresponding to all fourth target speeds, and the average exposure time is determined by using the average algorithm for the multiple exposure times as the standard exposure time of the camera device.

[0014] Optionally, at least half of all fourth target rotational speed sets are different target rotational speeds.

[0015] Optionally, the diameter of the turntable is greater than 10 cm.

[0016] Optionally, the diameter of the angle scale is greater than 10 cm.

[0017] Optionally, the turntable is a circular turntable, and the pointer length is the radius of the circular turntable.

[0018] Optionally, the color difference between a side of the turntable on which the pointer is set and a side of the turntable on which the pointer faces away from the turntable is greater than a preset value.

[0019] Optionally, the side of the turntable on which the pointer is set is white, and the side of the pointer facing away from the turntable is black.

[0020] Optionally, the end of the pointer pointing to the outer circumference of the turntable is an isosceles triangle, and the vertex corner of the isosceles triangle at the end of the pointer pointing to the outer circumference of the turntable is on the outer circumference of the turntable.

[0021] Optionally, the end of the pointer facing the center of the turntable is an isosceles triangle, and the vertex corner of the isosceles triangle of the end of the pointer facing the center of the turntable is on the center of the turntable.

[0022] Optionally, the length of the base of all isosceles triangles is greater than or equal to three times the width of the pointer.

[0023] Optionally, all isosceles triangles are equilateral triangles.

[0024] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0025] The embodiment of the present invention provides a device for testing the exposure time of a camera device, comprising: a turntable with a motor, a pointer fixed at the center of the turntable, a 360-degree angle scale set on the periphery of one side of the turntable on which the pointer is fixed, and the center of the 360-degree angle scale is concentric with the center of the turntable; when testing the exposure time of the camera device, the motor is started, and after the motor drives the turntable to rotate according to a predetermined speed of the motor, the camera device captures image data including the pointer, the turntable and the angle scale, so as to determine the exposure time of the camera device according to the fan-shaped trailing angle of the pointer captured in the image data. The test device has a simple layout when conducting a test, high exposure time detection technology precision, high flexibility, simplicity, low difficulty in device construction, easy and convenient maintenance, and easy replacement of parts to be repaired. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 A system structure diagram for testing the exposure time of a camera device provided by an embodiment of the present invention;

[0027] Figure 2 A structural diagram of a device for testing exposure time of a camera device provided by another embodiment of the present invention;

[0028] Figure 3 A schematic diagram of a turntable and an angle scale provided in another embodiment of the present invention;

[0029] Figure 4 A schematic diagram of an angle scale indicating accuracy provided by another embodiment of the present invention;

[0030] Figure 5 A schematic diagram of the fan-shaped angle of the exposure time pointer scanning provided by another embodiment of the present invention. DETAILED DESCRIPTION

[0031] The embodiment of the present invention provides a device for testing the exposure time of a camera device, which is used to improve the accuracy and flexibility of the exposure time detection technology.

[0032] The embodiment of the present invention provides a device for testing the exposure time of a camera device, which is applied to Figure 1 The system of testing the exposure time of the camera device is shown. Figure 1 As shown, the test system includes: a test device 1 and a camera device 2. Figure 2As shown, the testing device 1 includes a turntable 12 with a motor 11, a pointer 121 is fixed at the center of the turntable 12, a 360-degree angle scale 122 is arranged on the periphery of one side of the turntable 12 on which the pointer 121 is fixed, and the center of the 360-degree angle scale 122 is concentric with the center of the turntable 12; when testing the exposure time of the camera device 2, the motor 11 is started, and after the turntable 12 is driven by the motor 11 to rotate according to a predetermined rotation speed of the motor 11, the camera device 2 captures image data including the pointer 121, the turntable 12 and the angle scale 122, so as to determine the exposure time of the camera device 2 according to the fan-shaped trailing angle of the pointer 121 captured in the image data.

[0033] In this solution, since the equipment and tools used in the device are simple, and the turntable 12 with the pointer 121 and the angle scale 122 can be made by oneself. In addition, during the test, the camera device 2 only needs to shoot in the direction of the turntable and take clear pictures of the smear and scale of the pointer 121 of the turntable 12, thereby reducing the requirements for the placement of the equipment.

[0034] In the embodiment of the present invention, as long as the camera device 2 shoots in the direction of the turntable 12 and can take a complete picture of the turntable 12 and the angle scale 122, by checking the scale scale pointed to by the top of the pointer 121 of the turntable 12, the maximum scale and the minimum scale on both sides of the fan-shaped smear can be accurately read. In other embodiments, the camera device 2 does not shoot perpendicularly to the center of the turntable 12, and it does not affect the reading of the scale values ​​on both sides of the fan-shaped smear. This greatly reduces the requirements for the construction of the test system and greatly improves the test efficiency.

[0035] like Figure 3 As shown, the turntable 12 provided in this embodiment is circular, and the pointer 121 is a radius of the turntable 12. The pointer 121 is used to form a fan-shaped shadow as the turntable 12 rotates during the exposure process of the camera 2. In order to increase the color depth of the fan-shaped shadow, the circular turntable has a white background. At the same time, the width of the pointer 121 is greater than 1 / 20 of the pointer length, and the pointer is dark, preferably black. In order to improve the accuracy of the angle measurement of the fan-shaped shadow, the pointer 121 points to the center of the circle and the two ends of the circle edge. Isosceles triangles need to be used. The top corner of the isosceles triangle at one end of the center of the circle is located at the center of the circle, and the bottom edge points to the direction of the circle edge along the pointer 121; the top corner of the isosceles triangle near the circle edge is located on the circle edge, and the bottom edge points to the direction of the center of the circle along the pointer 121. Preferably, the length of the base of the two isosceles triangles is greater than 3 times the width of the pointer 121. Preferably, an equilateral triangle is used for the isosceles triangle. The turntable 12 is mounted on the constant speed motor 11. The center of the turntable is installed directly opposite the center of the rotating shaft of the motor 11.

[0036] Optionally, the turntable 12 is detachably connected to the motor 11 .

[0037] Optionally, the angle scale 122 is detachably connected to the turntable 12 .

[0038] Optionally, the testing device 1 includes a turntable cover, and the 360-degree angle scale 122 is set on the outer circumference of the turntable cover. The turntable 12 is sleeved with the turntable cover to fix the 360-degree angle scale 122 on the outer circumference of one side of the turntable 12 on which the pointer 121 is fixed.

[0039] Optionally, the testing device 1 includes an angle scale fixing member, and the 360-degree angle scale 122 is fixedly connected to the outer periphery of a side of the turntable 12 on which the pointer 121 is fixed via the angle scale fixing member.

[0040] Optionally, the motor 11 is a constant speed rotating motor 11, and the rotating shaft of the motor 11 is correspondingly installed at the center of the turntable 12. In the embodiment of the present invention, the test device composed of a constant speed motor, a turntable with a pointer and a 360-degree angle scale is very simple to build, which solves the problem of complex structure of the existing exposure time test system.

[0041] Optionally, the motor 11 is a constant speed motor 11 with adjustable speed. In the embodiment of the present invention, the motor 11 with the turntable 12 installed is placed in the test environment, the motor 11 is fixed, the ambient light is kept stable, and the camera 2 is placed facing the front of the turntable 12. After the turntable 12 rotates stably, the turntable 12 is photographed by the camera 2.

[0042] Optionally, when the motor 11 is a constant speed rotating motor 11 with adjustable speed, the speed of the motor 11 can be adjusted by a manual adjustment device provided on the motor 11 through manual adjustment by a tester.

[0043] Optionally, when the motor 11 is a constant speed rotating motor 11 with adjustable speed, the speed of the motor 11 can be automatically adjusted by activating a program set in the motor 11 according to the fan-shaped smear angle manually input by the tester through an automatic adjustment device set in the motor 11. In this embodiment, the target value of the automatically adjusted speed can refer to the following optional embodiments.

[0044] In the test device, the scale of the 360-degree angle scale 122 should be exposed around the outer edge of the turntable 12, and the center of the circle facing the scale should be concentric with the center of the turntable 12. The angle scale 122 should be fixed and cannot rotate or move during the test. Preferably, the angle scale 122 is a disk slightly larger than the turntable 12. Figure 4As shown, the scale of the angle scale 122 is evenly distributed outward from the outer edge of the turntable 12, and the scale is clear enough so that after the camera device 2 takes pictures, the arrow of the turntable pointer 121, that is, the scale values ​​of the angle scale 122 pointed to by both sides of the fan-shaped trail, can be clearly distinguished in the captured image.

[0045] Optionally, in the embodiment of the present invention, the test accuracy of the exposure time can be improved by the following three methods:

[0046] Method 1: Use a motor 11 with high speed accuracy and good speed stability;

[0047] Method 2: Increase the diameter of the rotating disk 12 and the angle scale 122 to improve the accuracy of the scale of the angle scale 122. In the embodiment of the present invention, the problem of low accuracy of the existing exposure time test results can be solved by using a rotating disk and a scale with a large radius.

[0048] Method three: perform multiple tests and take the average value of the exposure time.

[0049] like Figure 5 As shown, for the implementation example of the above-mentioned method three,

[0050] The exposure time t of a single test is calculated from the angle of the fan-shaped smear θ and the angular velocity ω of the turntable. The calculation formula is as follows:

[0051] t=θ / ω

[0052] Among them, when the fan-shaped shadow does not cross the 0 degree scale,

[0053]

[0054] and They are the two scales corresponding to the arrows on both sides of the fan in the fan-shaped shadow. and Directly read the captured image is a larger value, is a smaller value.

[0055] When the fan-shaped shadow crosses the 0 degree scale,

[0056]

[0057] and They are the two scales corresponding to the arrows on both sides of the fan in the fan-shaped shadow. and Directly read the captured image is a larger value, is a smaller value.

[0058] ω=360°·n

[0059] In the embodiment of the present invention, n is the rotation speed of the turntable, which has been set when the motor speed is adjusted and can be directly read in the setting interface of the motor speed.

[0060] In the embodiment of the present invention, the exposure time t of a single test is calculated from the test record data according to the following formula.

[0061]

[0062] A single shot is easily affected by environmental and operational interference factors. You can reduce the impact of environmental and operational interference factors on the test results by repeatedly testing the exposure time and calculating the average of the multiple test exposure times.

[0063] For example, the exposure time is tested repeatedly N times, and the test results of each time are recorded in sequence as t1, t2, t3, ..., t N , and then use the following formula to average the N test results to get the average exposure time

[0064]

[0065] In this solution, as long as the shadow and scale of the pointer 121 of the turntable 12 are clearly photographed, the accurate reading can be achieved. and The value of θ can be used to accurately calculate the angle θ of the pointer 121, and the angle θ of the pointer 121 will not be measured due to the fact that the camera 2 is not completely facing the turntable and the turntable 12 is cut obliquely in the image, thereby improving the accuracy of the test result. In addition, the calculation formula of the exposure time is middle, and The n value is directly read and does not need to be measured later, thus achieving efficient testing results.

[0066] Optionally, when the fan-shaped shadow angle is less than 180 degrees, the speed of the motor 11 is increased to a first target speed, and the first target speed is the speed when the fan-shaped shadow angle of the pointer 121 in the image data captured by the camera device 2 after the motor 11 increases the speed is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device 2 based on the fan-shaped shadow angle of the pointer 121 in the image data captured by the camera device 2 when the motor 11 is operating at the first target speed.

[0067] Optionally, the motor 11 is a constant speed rotating motor 11 with adjustable speed. When the fan-shaped shadow angle is greater than 360 degrees, the speed of the motor 11 is reduced to a second target speed. The second target speed is the speed when the fan-shaped shadow angle of the pointer 121 in the image data captured by the camera device 2 after the motor 11 is reduced in speed is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device 2 according to the fan-shaped shadow angle of the pointer 121 in the image data captured by the camera device 2 when the motor 11 is operating at the second target speed.

[0068] Optionally, the motor 11 is a constant speed rotating motor 11 with adjustable speed. When the fan-shaped drag angle is less than 180 degrees, the speed of the motor 11 is increased to multiple third target speeds, and each of the third target speeds is the speed when the fan-shaped drag angle of the pointer 121 in the image data captured by the camera device 2 after the motor 11 increases the speed is greater than 180 degrees and less than 360 degrees. The exposure time of the camera device 2 is determined according to each fan-shaped drag angle of the pointer 121 in each image data captured by the camera device 2 when the motor 11 works at each third target speed, so as to obtain multiple exposure times corresponding to all third target speeds, and the average exposure time is determined by using the average algorithm for the multiple exposure times as the standard exposure time of the camera device 2.

[0069] Optionally, at least half of all the third target rotational speed sets are different target rotational speeds.

[0070] Optionally, the motor 11 is a constant speed rotating motor 11 with adjustable speed. When the fan-shaped drag angle is greater than 360 degrees, the speed of the motor 11 is reduced to multiple fourth target speeds, and each of the fourth target speeds is the speed when the fan-shaped drag angle of the pointer 121 in the image data captured by the camera device 2 after the motor 11 is reduced in speed is greater than 180 degrees and less than 360 degrees. The exposure time of the camera device 2 is determined according to each fan-shaped drag angle of the pointer 121 in each image data captured by the camera device 2 when the motor 11 works at each fourth target speed, so as to obtain multiple exposure times corresponding to all fourth target speeds, and the average exposure time is determined by using the average algorithm for the multiple exposure times as the standard exposure time of the camera device 2.

[0071] Optionally, at least half of all fourth target rotational speed sets are different target rotational speeds.

[0072] Optionally, the diameter of the turntable 12 is greater than 10CM.

[0073] Optionally, the diameter of the angle scale 122 is greater than 10CM.

[0074] Optionally, the turntable 12 is a circular turntable 12 , and the length of the pointer 121 is the radius of the circular turntable 12 .

[0075] Optionally, the color difference between a side of the turntable 12 on which the pointer 121 is arranged and a side of the pointer 121 facing away from the turntable 12 is greater than a preset value.

[0076] Optionally, the side of the turntable 12 on which the pointer 121 is set is white, and the side of the pointer 121 facing away from the turntable 12 is black.

[0077] Optionally, the end of the pointer 121 pointing to the outer circumference of the turntable 12 is an isosceles triangle, and the vertex corner of the isosceles triangle at the end of the pointer 121 pointing to the outer circumference of the turntable 12 is on the outer circumference of the turntable 12 .

[0078] Optionally, the end of the pointer 121 facing the center of the turntable 12 is an isosceles triangle, and the vertex of the isosceles triangle of the end of the pointer 121 facing the center of the turntable 12 is on the center of the turntable 12 .

[0079] Optionally, the length of the base of all isosceles triangles is greater than or equal to three times the width of the pointer 121 .

[0080] Optionally, all isosceles triangles are equilateral triangles.

[0081] It can be seen from the above technical solutions that the embodiments of the present invention have the following advantages:

[0082] The embodiment of the present invention provides a device for testing the exposure time of a camera device, comprising: a turntable with a motor, a pointer fixed at the center of the turntable, a 360-degree angle scale set on the periphery of one side of the turntable on which the pointer is fixed, and the center of the 360-degree angle scale is concentric with the center of the turntable; when testing the exposure time of the camera device, the motor is started, and after the motor drives the turntable to rotate according to a predetermined speed of the motor, the camera device captures image data including the pointer, the turntable and the angle scale, so as to determine the exposure time of the camera device according to the fan-shaped trailing angle of the pointer captured in the image data. The test device has a simple layout when conducting a test, high exposure time detection technology precision, high flexibility, simplicity, low difficulty in device construction, easy and convenient maintenance, and easy replacement of parts to be repaired.

[0083] In the above embodiments, all or part of the embodiments may be implemented by software, hardware, firmware or any combination thereof. When implemented by software, all or part of the embodiments may be implemented in the form of a computer program product.

[0084] The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, the process or function described in the embodiment of the present invention is generated in whole or in part. The computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions may be stored in a computer-readable storage medium, or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website site, a computer, a server, or a data center to another website site, a computer, a server, or a data center by wired (e.g., coaxial cable, optical fiber, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium may be any available medium that a computer can store or a data storage device such as a server or a data center that includes one or more available media integrated. The available medium may be a magnetic medium (e.g., a floppy disk, a hard disk, a tape), an optical medium (e.g., a DVD), or a semiconductor medium (e.g., a solid-state drive Solid State Disk (SSD)), etc.

[0085] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0086] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0089] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0090] As described above, the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A device for testing the exposure time of a camera device, characterized in that: include: A turntable with a motor, a pointer is fixed at the center of the turntable, a 360-degree angle scale is arranged on the periphery of a side of the turntable on which the pointer is fixed, and the center of the 360-degree angle scale is concentric with the center of the turntable; when testing the exposure time of the camera device, the motor is started, and after the motor drives the turntable to rotate according to a predetermined speed of the motor, the camera device captures image data including the pointer, the turntable and the angle scale, so as to determine the exposure time of the camera device according to the fan-shaped trailing angle of the pointer captured in the image data; The device also includes a turntable cover, the outer circumference of which is provided with the 360-degree angle scale, and the turntable is covered with the turntable cover so that the 360-degree angle scale is fixedly provided on the outer circumference of a side of the turntable where the pointer is fixed; The device further comprises an angle scale fixing part, through which the 360-degree angle scale is fixedly connected to the outer periphery of a side of the turntable on which the pointer is fixed; The motor is a constant speed rotating motor, and the rotating shaft of the motor is installed correspondingly at the center of the turntable; The motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped shadow angle is less than 180 degrees, the speed of the motor is increased to a first target speed. The first target speed is the speed when the fan-shaped shadow angle of the pointer in the image data captured by the camera device after the motor speed is increased is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device based on the fan-shaped shadow angle of the pointer in the image data captured by the camera device when the motor is operating at the first target speed.

2. The device according to claim 1, characterized in that The motor is a constant speed rotating motor with adjustable speed. When the fan-shaped shadow angle is greater than 360 degrees, the speed of the motor is reduced to a second target speed. The second target speed is the speed when the fan-shaped shadow angle of the pointer in the image data captured by the camera device after the motor is reduced in speed is greater than 180 degrees and less than 360 degrees, so as to determine the exposure time of the camera device based on the fan-shaped shadow angle of the pointer in the image data captured by the camera device when the motor is operating at the second target speed.

3. The device according to claim 1, characterized in that The motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped drag angle is less than 180 degrees, the speed of the motor is increased to multiple third target speeds, and each of the third target speeds is the speed when the fan-shaped drag angle of the pointer in the image data captured by the camera device after the motor increases the speed is greater than 180 degrees and less than 360 degrees. The exposure time of the camera device is determined according to each fan-shaped drag angle of the pointer in each image data captured by the camera device when the motor works at each third target speed, so as to obtain multiple exposure times corresponding to all third target speeds, and the average exposure time is determined by using an average algorithm for the multiple exposure times as the standard exposure time of the camera device.

4. The device according to claim 3, characterized in that At least half of all third target speed sets are different target speeds.

5. The device according to claim 1, characterized in that The motor is a constant-speed rotating motor with adjustable speed. When the fan-shaped drag angle is greater than 360 degrees, the speed of the motor is reduced to multiple fourth target speeds, and each of the fourth target speeds is the speed when the fan-shaped drag angle of the pointer in the image data captured by the camera device after the motor is reduced in speed is greater than 180 degrees and less than 360 degrees. The exposure time of the camera device is determined according to each fan-shaped drag angle of the pointer in each image data captured by the camera device when the motor works at each fourth target speed, so as to obtain multiple exposure times corresponding to all fourth target speeds, and the average exposure time is determined by using an average algorithm for the multiple exposure times as the standard exposure time of the camera device.

6. The device according to claim 5, characterized in that At least half of all fourth target speed sets are different target speeds.

Images