Camera sampling time delay measurement system and method

Abstract

This invention provides a camera sampling time delay measurement system and method. The timing device includes a first timer, a second timer, and a transmission mechanism. The first timer drives the second timer via the transmission mechanism. The laser source includes a first laser source and a second laser source. The laser emitted from the first laser source enters the first timer, displaying a first laser mark. The laser emitted from the second laser source enters the second timer, displaying a second laser mark. The lens of the camera under test faces the timing device. A first motor simultaneously drives a first reflector to rotate, forming the first laser mark on the first timer. The first motor, via the transmission mechanism, starts the second timer, forming the second laser mark on it. The camera captures an image of the timing device. Based on the image from the timing device, the camera imaging time and sampling time delay are calculated, improving the system's testing accuracy and ensuring structural reliability.

Description

Technical Field

[0001] This invention relates to the field of image processing technology, and more specifically, to a camera sampling time delay measurement system and method. Background Technology

[0002] When faced with image processing requirements that demand high real-time performance, it is often necessary to obtain the most accurate possible time to assist in judging and optimizing the image processing work. To achieve this goal, existing technologies involve capturing an image of a stopwatch, clock, or electronic watch face, and using the time difference between the time of the image content and the time of image acquisition as the time from image formation to image acquisition.

[0003] The above methods can obtain a rough time delay, but they have the following shortcomings: the time source of the shooting and the time source of the image acquisition platform are inconsistent, resulting in a time difference that is unknown; millisecond-level mechanical clocks are rare on the market and are very expensive, while electronic clocks are limited by refresh rates and other factors, and their actual accuracy is generally above ten milliseconds; the exposure times of different rows of the camera in the rolling shutter exposure are different, which will also result in some differences in the acquired image content, affecting the judgment. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the purpose of this invention is to provide a camera sampling time delay measurement system and method.

[0005] In a first aspect, the present invention provides a camera sampling time delay measurement system, including a camera under test, a laser source, a timing device, and a back-end platform; the timing device includes a first timer, a second timer, and a transmission mechanism, wherein the first timer drives the second timer through the transmission mechanism; the laser source includes a first laser source and a second laser source, wherein the laser emitted from the first laser source enters the first timer, and the first timer displays a first laser indicator; the laser emitted from the second laser source enters the second timer, and the second timer displays a second laser indicator; the camera under test is electrically connected to the back-end platform, and the lens of the camera under test faces the timing device.

[0006] Preferably, the first timer includes a first motor, a first reflector, and a first dial. The first reflector is disposed on the first rotating shaft of the first motor, and the first dial includes a first central hole. The first reflector is positioned directly opposite the center of the first central hole.

[0007] The laser emitted from the first laser source passes through the first central hole and is reflected by the first reflector to the first dial to form the first laser mark.

[0008] Preferably, the second timer includes a second motor, a second reflector, and a second dial. The second motor is driven by a transmission mechanism. The second reflector is disposed on the second rotating shaft of the second motor. The second dial includes a second central hole, and the second reflector is positioned directly opposite the center of the second central hole.

[0009] The laser emitted from the second laser source passes through the second central hole and is reflected by the second reflector to the second dial to form the second laser mark.

[0010] Preferably, the first timer and the second timer are placed side by side, with the first dial and the second dial located in the same plane and facing the same direction.

[0011] Preferably, the zero position of the first timer is located at the top or bottom of the first dial;

[0012] The zero position of the second timer is located at the top or bottom of the second dial;

[0013] The timing device further includes a motor controller, the first motor includes a first encoder, and the motor controller acquires the position reading of the first encoder and aligns the time zero point with the position zero point.

[0014] Preferably, the motor controller and the back-end platform are precisely synchronized via high-speed cables, with a time error of less than 1ms.

[0015] Preferably, the transmission ratio of the transmission mechanism is: , The rotation period of the first motor is an integer or a fraction of an integer. The rotation period of the second motor is .

[0016] Secondly, the present invention provides a camera sampling time delay measurement method, utilizing the aforementioned camera sampling time delay measurement system, comprising:

[0017] Step S1: Build and power on the camera sampling time delay measurement system, and synchronize the time between the motor controller and the back-end platform;

[0018] Step S2: Start the timing device, the first motor and the second motor rotate, aligning the time zero position and position zero position of the first motor;

[0019] Step S3: Turn on the first laser source and the second laser source. The laser emitted by the first laser source will display a first laser mark on the first dial, and the laser emitted by the second laser source will display a second laser mark on the second dial.

[0020] Step S4: The camera under test takes a picture of the timing device and sends the image to the backend platform. The backend platform receives the image at the specified time. For camera sampling time;

[0021] Step S5: Calculate the camera imaging time based on the image from the timing device. ;

[0022] Step S6: According to and Calculate the camera sampling time delay .

[0023] Preferably, in step S1, the motor controller and the back-end platform are synchronized via network time through a high-speed cable, with a time error of less than 1ms.

[0024] Preferably, in step S2, after the timing device is started, the motor controller controls the first motor to rotate, and the first motor drives the second motor to rotate through the transmission mechanism;

[0025] The rotation period of the first motor is The transmission ratio of the transmission mechanism is The rotation period of the second motor is ,in It is an integer or one-integer fraction. and The larger value in the image is greater than the time taken by the backend platform to acquire the image;

[0026] The first motor rotates, causing the first reflector to rotate synchronously, and the second motor rotates, causing the second reflector to rotate synchronously.

[0027] Preferably, in step S2, the zero position of the first timer is located at the top or bottom of the first dial, and the zero position of the second timer is located at the top or bottom of the second dial.

[0028] The first motor includes a first encoder, and the motor controller acquires the position reading of the first encoder and aligns the time zero point and the position zero point.

[0029] Preferably, in step S3, the first laser source is turned on, and the laser emitted by the first laser source shines directly on the center of the first reflector. The laser is reflected onto the first dial and appears as a first laser line radiating outward from the center. The first laser line rotates synchronously with the rotation of the first reflector.

[0030] When the second laser source is turned on, the laser emitted continuously from the second laser source shines directly onto the center of the second reflector. The laser is reflected onto the second dial and appears as a second laser line radiating outward from the center. The second laser line rotates synchronously with the rotation of the second reflector.

[0031] Preferably, in step S4, the lens of the camera under test is facing the timing device, and the imaging range of the camera under test includes the entire timing device;

[0032] The camera under test starts exposure and takes pictures from time zero, and the images captured by the camera under test contain complete first laser markers and second laser markers.

[0033] Preferably, step S5 includes:

[0034] Step S5.1: Read the scale value corresponding to the first laser mark in the image respectively. and the scale value corresponding to the second laser mark. ;

[0035] Step S5.2: Based on and Calculate camera imaging time :

[0036] like ,but

[0037]

[0038] in, The rotation period of the first motor is denoted as . and These are the total scale values ​​of the first and second dials, respectively. The transmission ratio of the transmission mechanism from the first motor to the second motor is an integer. This is the floor function;

[0039] like ,but

[0040]

[0041] in, The rotation cycle of the second motor is given. and These are the total scale values ​​of the first and second dials, respectively. The transmission ratio of the transmission mechanism from the first motor to the second motor is an integer fraction. This is the floor function.

[0042] Preferably, In the image captured by the camera under test, the first laser marker appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. ;

[0043] In the image captured by the camera under test, the second laser mark appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. .

[0044] Preferably, the camera under test includes a rolling shutter exposure camera, and step S5 includes:

[0045] Step S5.1: If Determine the pixel point where the first laser line within the first laser mark in the image intersects with the outer edge of the first dial. ;like Determine the pixel point where the second laser line within the second laser mark intersects with the outer edge of the second dial in the image. ;

[0046] Step S5.2: Determine the pixel point or Positioned within the entire image, based on the row number of the pixel. express;

[0047] Step S5.3: Based on Calculate camera imaging time The formula is as follows:

[0048]

[0049] in, This represents the total number of rows in the entire image. The timestamp value read from the data packet. The interval between two rows of image exposure.

[0050] Compared with the prior art, the present invention has the following beneficial effects:

[0051] 1. The present invention uses a first motor to simultaneously drive a first reflector to rotate and form a first laser mark on a first timer. The first motor also drives a second timer to start via a transmission mechanism, forming a second laser mark on the second timer. A camera captures the timing device and sends the image to a back-end platform. Based on the image from the timing device, the camera imaging time and sampling time delay are calculated, which helps to improve the testing accuracy of the system and ensures a reliable structure.

[0052] 2. Compared with traditional image time testing, this invention can more accurately obtain the time consumption from camera imaging to image acquisition. It not only significantly improves accuracy and reliability, but also makes various time losses and errors more controllable, which can more conveniently assist in the development and debugging of image sensors. Attached Figure Description

[0053] Other features, objects, and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0054] Figure 1 This is a schematic diagram of the camera sampling time delay measurement system provided by the present invention;

[0055] Figure 2 This is a front view of the timing device provided by the present invention;

[0056] Figure 3 This is a flowchart illustrating the camera sampling time delay measurement method provided by the present invention.

[0057] Reference numerals: 1. Camera under test; 2. Laser source; 201. First laser source; 202. Second laser source; 3. Timing device; 4. Rear platform; 5. First timer; 501. First motor; 50101. First rotating shaft; 502. First reflector; 503. First dial; 50301. First center hole; 50302. First laser line; 6. Second timer; 601. Second motor; 60101. Second rotating shaft; 602. Second reflector; 603. Second dial; 60301. Second center hole; 60302. Second laser line; 7. Transmission mechanism; 8. Motor controller; 9. High-speed cable; 10. First bracket; 11. Second bracket. Detailed Implementation

[0058] The present invention will now be described in detail with reference to specific embodiments. These embodiments will help those skilled in the art to further understand the present invention, but do not limit the invention in any way. It should be noted that those skilled in the art can make several changes and improvements without departing from the concept of the present invention. These all fall within the protection scope of the present invention.

[0059] like Figure 1 and Figure 2 As shown, a camera sampling time delay measurement system provided by the present invention includes a camera under test 1, a laser source 2, a timing device 3, and a back-end platform 4.

[0060] The timing device 3 includes a first timer 5, a second timer 6, and a transmission mechanism 7. The first timer 5 drives the second timer 6 through the transmission mechanism 7. The transmission mechanism 7 uses gear transmission; it should be noted that the transmission mechanism 7 is a commonly used gear transmission structure in the prior art. The laser source 2 includes a first laser source 201 and a second laser source 202. The laser emitted from the first laser source 201 enters the first timer 5, and the first timer 5 displays a first laser mark. The laser emitted from the second laser source 202 enters the second timer 6, and the second timer 6 displays a second laser mark. The camera under test 1 is electrically connected to the back-end platform 4, and the lens of the camera under test 1 is directly facing the timing device 3.

[0061] Specifically, the first timer 5 includes a first motor 501, a first reflector 502, and a first dial 503. The first reflector 502 is mounted on the first rotating shaft 50101 of the first motor 501. The first dial 503 includes a first central hole 50301, and the first reflector 502 is positioned directly opposite the center of the first central hole 50301. More specifically, the first motor 501 is horizontally placed and has a first rotating shaft 50101, the axis of which is parallel to the ground. The first reflector 502 is circular in shape, fixedly mounted on the first rotating shaft 50101 and tilted backward at 45°, with its center located on the axis of the first rotating shaft 50101. The first dial 503 is fixed vertically above the ground by the first bracket 10. The first dial 503 is circular in shape and has a first central hole 50301. The diameter of the first central hole 50301 is slightly larger than the outer diameter of the first reflector 502. The first reflector 502 is located in the center of the first central hole 50301.

[0062] Specifically, the second timer 6 includes a second motor 601, a second reflector 602, and a second dial 603. The second motor 601 is driven by a transmission mechanism 7. The second reflector 602 is mounted on the second rotating shaft 60101 of the second motor 601. The second dial 603 includes a second central hole 60301, and the second reflector 602 is positioned directly opposite the center of the second central hole 60301. More specifically, the second motor 601 is horizontally placed and has a second rotating shaft 60101 parallel to the ground. The second reflector 602 is circular and is fixedly mounted on the second rotating shaft 60101, tilted backward at 45°. The center of the second reflector 602 is located on the axis of the second rotating shaft 60101. The second dial 603 is fixed vertically above the ground by the second bracket 11. The second dial 603 is circular and has a second central hole 60301. The diameter of the second central hole 60301 is slightly larger than the outer diameter of the second reflector 602. The second reflector 602 is located in the center of the second central hole 60301.

[0063] Furthermore, the laser emitted from the first laser source 201 passes through the first central hole 50301 and is reflected by the first reflector 502 to the first dial 503 to form the first laser mark. The first laser source 201 is positioned directly in front of the first timer 5. The first laser source 201 can continuously emit horizontal laser light, which is directed at the center of the first reflector 502 and then reflected onto the first dial 503, appearing as a first laser line 50302 radiating outward from the center. The first laser line 50302 acts on the first dial 503 to form the first laser mark.

[0064] The laser emitted from the second laser source 202 passes through the second central hole 60301 and is reflected by the second reflector 602 to the second dial 603, forming a second laser mark. The second laser source 202 is positioned directly in front of the second timer 6 and can continuously emit horizontal laser light. This laser light shines directly onto the center of the second reflector 602 and is then reflected onto the second dial 603, appearing as a second laser line 60302 radiating outward from the center. The second laser line 60302 acts on the second dial 603 to form the second laser mark.

[0065] The first timer 5 and the second timer 6 are placed side by side, and the first dial 503 and the second dial 603 are located in the same plane and face the same direction. The first laser source 201 and the second laser source 202 are the same, the first timer 5 and the second timer 6 are the same, and the first timer 5 and the second timer 6 are placed side by side, wherein the first dial 503 and the second dial 603 are located in the same plane and face the same direction.

[0066] The zero position of the first timer 5 is located at the top or bottom of the first dial 503. The zero position of the second timer 6 is located at the top or bottom of the second dial 603. The timing device 3 also includes a motor controller 8. The first motor 501 includes a first encoder. The motor controller 8 acquires the position reading of the first encoder and aligns the time zero position with the position zero position.

[0067] The motor controller 8 and the backend platform 4 are precisely synchronized via high-speed cable 9, with a time error of less than 1ms. The transmission ratio of the transmission mechanism 7 is... , The rotation period of the first motor 501 is an integer or a fraction of an integer. The rotation cycle of the second motor 601 is .

[0068] The lens of the camera under test 1 is facing the timing device 3, and its imaging range includes the entire timing device 3; the camera under test 1 sends the captured photos to the back-end platform 4, and the back-end platform 4 determines the camera sampling time based on the time of obtaining the photos.

[0069] like Figure 3 As shown, the present invention also includes a camera sampling time delay measurement method, utilizing the above-described camera sampling time delay measurement system, comprising:

[0070] Step S1: Build and power on the camera sampling time delay measurement system, and synchronize the motor controller 8 and the backend platform 4 in time. Specifically, the motor controller 8 and the backend platform 4 are synchronized via a high-speed cable 9, with a time error of less than 1ms. That is to say, they can be approximately considered to have the same zero point in time.

[0071] Step S2: Start the timing device 3. The first motor 501 and the second motor 601 rotate, aligning the time zero position and position zero position of the first motor 501. After starting the timing device 3, the motor controller 8 controls the rotation of the first motor 501, which in turn drives the second motor 601 to rotate via the transmission mechanism 7. The rotation period of the first motor 501 is... The transmission ratio of transmission mechanism 7 is The rotation cycle of the second motor 601 is ,in It is an integer or one-integer fraction. and The larger value in the time frame is greater than the time taken by the backend platform 4 to acquire the image. The first motor 501 rotates, causing the first reflector 502 to rotate synchronously, and the second motor 601 rotates, causing the second reflector 602 to rotate synchronously. The zero position of the first timer 5 is located at the top or bottom of the first dial 503, and the zero position of the second timer 6 is located at the top or bottom of the second dial 603. The first motor 501 includes a first encoder, and the motor controller 8 acquires the position reading of the first encoder and aligns the time zero position with the position zero position. Specifically, the motor controller 8 determines the rotational position of the first motor 501 based on the position reading of the first encoder, and then uses feedback control to ensure that the rotational position of the first motor 501 is at the position zero position when the time zero position is reached.

[0072] Step S3: Turn on the first laser source 201 and the second laser source 202. The laser emitted from the first laser source 201 displays a first laser mark on the first dial 503, and the laser emitted from the second laser source 202 displays a second laser mark on the second dial 603. Turning on the first laser source 201, the laser emitted continuously from it shines directly at the center of the first reflector 502. The laser is reflected onto the first dial 503 as a first laser line 50302 radiating outwards from the center. The first laser line 50302 rotates synchronously with the rotation of the first reflector 502. Turning on the second laser source 202, the laser emitted continuously from it shines directly at the center of the second reflector 602. The laser is reflected onto the second dial 603 as a second laser line 60302 radiating outwards from the center. The second laser line 60302 rotates synchronously with the rotation of the second reflector 602.

[0073] Step S4: The camera under test 1 takes a picture of the timing device 3 and sends the image to the backend platform 4. The backend platform 4 obtains the time of the image. The sampling time for the camera is specified. The lens of the camera under test 1 is directly facing the timing device 3, and the imaging range of the camera under test 1 includes the entire timing device 3. The camera under test 1 starts exposure and shooting from time zero, and the image captured by the camera under test 1 contains the complete first laser mark and second laser mark.

[0074] Step S5: Calculate the camera imaging time based on the image from timing device 3. Step S5 includes:

[0075] Step S5.1: Read the scale value corresponding to the first laser mark in the image respectively. and the corresponding scale value of the second laser mark. .

[0076] Step S5.2: Based on and Calculate camera imaging time :

[0077] like ,but

[0078]

[0079] in, The rotation cycle of the first motor 501, and These are the total scale values ​​of the first dial 503 and the second dial 603, respectively. The transmission ratio of the transmission mechanism 7 from the first motor 501 to the second motor 601 is an integer. This is the floor function;

[0080] like ,but

[0081]

[0082] in, The rotation cycle of the second motor 601, and These are the total scale values ​​of the first dial 503 and the second dial 603, respectively. The transmission ratio of the transmission mechanism 7 from the first motor 501 to the second motor 601 is an integer fraction. This is the floor function.

[0083] Furthermore, In the image captured by the camera under test 1, the first laser mark appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. . In the image captured by the camera under test 1, the second laser mark appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. .

[0084] One variation of this invention is that the camera under test 1 uses a rolling shutter exposure camera. When using a rolling shutter exposure camera, the camera imaging time... The calculation steps are as follows:

[0085] Step S5.1: If The pixel at the intersection of the first laser line 50302 within the first laser mark in the image and the outer edge of the first scale 503 is determined. ;like Determine the pixel point at the intersection of the second laser line 60302 within the second laser mark in the image and the outer edge of the second scale 603. .

[0086] Step S5.2: Determine the pixel point or Positioned within the entire image, based on the row number of the pixel. express.

[0087] Step S5.3: Based on Calculate camera imaging time The formula is as follows:

[0088]

[0089] in, This represents the total number of rows in the entire image. The timestamp value read from the data packet. The interval between two rows of image exposure.

[0090] Step S6: According to and Calculate the camera sampling time delay .

[0091] Those skilled in the art will understand that, in addition to implementing the system, apparatus, and their modules provided by this invention in purely computer-readable program code, the same program can be implemented in the form of logic gates, switches, application-specific integrated circuits, programmable logic controllers, and embedded microcontrollers by logically programming the method steps. Therefore, the system, apparatus, and their modules provided by this invention can be considered a hardware component, and the modules included therein for implementing various programs can also be considered structures within the hardware component; alternatively, modules for implementing various functions can be considered both software programs implementing the method and structures within the hardware component.

[0092] Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. Unless otherwise specified, the embodiments and features described in this application can be arbitrarily combined with each other.

Claims

1. A camera sampling time delay measurement system, characterized in that, This includes the camera under test, laser source, timing device, and backend platform; The timing device includes a first timer, a second timer, and a transmission mechanism, wherein the first timer drives the second timer through the transmission mechanism; The laser source includes a first laser source and a second laser source. The laser emitted from the first laser source enters a first timer, and the first timer displays a first laser symbol. The laser emitted from the second laser source enters the second timer, and the second timer displays the second laser indicator; The camera under test is electrically connected to the back-end platform, and the lens of the camera under test is facing the timing device. The first timer includes a first motor, a first reflector, and a first dial. The first reflector is disposed on the first rotating shaft of the first motor. The first dial includes a first central hole, and the first reflector is positioned directly opposite the center of the first central hole. The laser emitted from the first laser source passes through the first central hole and is reflected by the first reflector to the first dial to form the first laser mark; The second timer includes a second motor, a second reflector, and a second dial. The second motor is driven by a transmission mechanism. The second reflector is mounted on the second rotating shaft of the second motor. The second dial includes a second central hole, and the second reflector is positioned directly opposite the center of the second central hole. The laser emitted from the second laser source passes through the second central hole and is reflected by the second reflector to the second dial to form the second laser mark; The first timer and the second timer are placed side by side, with the first dial and the second dial located in the same plane and facing the same direction.

2. The camera sampling time delay measurement system according to claim 1, characterized in that, The zero position of the first timer is located at the top or bottom of the first dial; The zero position of the second timer is located at the top or bottom of the second dial; The timing device further includes a motor controller, the first motor includes a first encoder, and the motor controller acquires the position reading of the first encoder and aligns the time zero point with the position zero point.

3. The camera sampling time delay measurement system according to claim 2, characterized in that, The motor controller and the back-end platform are precisely synchronized via high-speed cables, with a time error of less than 1ms.

4. The camera sampling time delay measurement system according to claim 1, characterized in that, The transmission ratio of the transmission mechanism is , The rotation period of the first motor is an integer or a fraction of an integer. The rotation period of the second motor is .

5. A method for measuring camera sampling time delay, characterized in that, The camera sampling time delay measurement system according to any one of claims 1 to 4 includes: Step S1: Build and power on the camera sampling time delay measurement system, and synchronize the time between the motor controller and the back-end platform; Step S2: Start the timing device, the first motor and the second motor rotate, aligning the time zero position and position zero position of the first motor; Step S3: Turn on the first laser source and the second laser source. The laser emitted by the first laser source will display a first laser mark on the first dial, and the laser emitted by the second laser source will display a second laser mark on the second dial. Step S4: The camera under test takes a picture of the timing device and sends the image to the backend platform. The backend platform receives the image at the specified time. For camera sampling time; Step S5: Calculate the camera imaging time based on the image from the timing device. ; Step S6: According to and Calculate the camera sampling time delay ; Step S5 includes: Step S5.1: Read the scale value corresponding to the first laser mark in the image respectively. and the scale value corresponding to the second laser mark. ; Step S5.2: Based on and Calculate camera imaging time : like ,but in, The rotation period of the first motor is . and These are the total scale values ​​of the first and second dials, respectively. The transmission ratio of the transmission mechanism from the first motor to the second motor is an integer. This is the floor function; like ,but in, The rotation cycle of the second motor is given. and These are the total scale values ​​of the first and second dials, respectively. The transmission ratio of the transmission mechanism from the first motor to the second motor is an integer fraction. This is the floor function.

6. The camera sampling time delay measurement method according to claim 5, characterized in that, In step S1, the motor controller and the back-end platform synchronize their network time via a high-speed cable, with a time error of less than 1ms.

7. The camera sampling time delay measurement method according to claim 5, characterized in that, In step S2, after the timing device is started, the motor controller controls the first motor to rotate, and the first motor drives the second motor to rotate through the transmission mechanism; The rotation period of the first motor is The transmission ratio of the transmission mechanism is The rotation period of the second motor is ,in It is an integer or one-integer fraction. and The larger value in the image is greater than the time taken by the backend platform to acquire the image; The first motor rotates, causing the first reflector to rotate synchronously, and the second motor rotates, causing the second reflector to rotate synchronously.

8. The camera sampling time delay measurement method according to claim 7, characterized in that, In step S2, the zero position of the first timer is located at the top or bottom of the first dial, and the zero position of the second timer is located at the top or bottom of the second dial. The first motor includes a first encoder, and the motor controller acquires the position reading of the first encoder and aligns the time zero point and the position zero point.

9. The camera sampling time delay measurement method according to claim 8, characterized in that, In step S3, the first laser source is turned on, and the laser emitted by the first laser source shines directly on the center of the first reflector. The laser is reflected onto the first dial and appears as a first laser line radiating outward from the center. The first laser line rotates synchronously with the rotation of the first reflector. When the second laser source is turned on, the laser emitted continuously from the second laser source shines directly onto the center of the second reflector. The laser is reflected onto the second dial and appears as a second laser line radiating outward from the center. The second laser line rotates synchronously with the rotation of the second reflector.

10. The camera sampling time delay measurement method according to claim 5, characterized in that, In step S4, the lens of the camera under test is facing the timing device, and the imaging range of the camera under test includes the entire timing device. The camera under test starts exposure and takes pictures from time zero, and the images captured by the camera under test contain complete first laser markers and second laser markers.

11. The camera sampling time delay measurement method according to claim 5, characterized in that, In the image captured by the camera under test, the first laser marker appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. ; In the image captured by the camera under test, the second laser marker appears as a fan-shaped area. The corresponding scale value is calculated based on the upper edge of the fan-shaped area. .

12. The camera sampling time delay measurement method according to claim 5, characterized in that, The camera under test includes a rolling shutter exposure camera. Step S5 includes: Step S5.1: If Determine the pixel point where the first laser line within the first laser mark in the image intersects with the outer edge of the first dial. ;like Determine the pixel point where the second laser line within the second laser mark intersects with the outer edge of the second dial in the image. ; Step S5.2: Determine the pixel point or Positioned within the entire image, based on the row number of the pixel. express; Step S5.3: Based on Calculate camera imaging time The formula is as follows: in, This represents the total number of rows in the entire image. The timestamp value read from the data packet. The interval between two rows of image exposure.

Images