Test bench device and test method for driver monitoring system

Abstract

The invention discloses a test bench device for a driver monitoring system and a test method, the test bench device comprises a bench base, and the bench base is used for simulating a vehicle cab; the seat assembly is arranged on the rack base and is used for simulating a vehicle seat; the image collector is arranged on the rack base through the position adjusting mechanism, and the image collector is used for collecting real-time face image data of a driver sitting on the seat assembly; the position adjusting mechanism is used for adjusting the position of the image collector, so that the relative distance of the optical center of the image collector relative to a preset reference point of the seat assembly in the X direction, the Y direction and the Z direction reaches a preset distance, an angle adjusting mechanism is arranged on the position adjusting mechanism, and the angle adjusting mechanism is used for adjusting the angle of the image collector. According to the invention, after the driver monitoring system which is tested by means of the test bench device is assembled on a real vehicle, the phenomenon of false alarm or missing alarm is not easy to occur.

Description

Technical Field

[0001] This invention relates to the field of fatigue testing technology, and more specifically to a test bench device and testing method for a driver monitoring system. Background Technology

[0002] Driver fatigue is the leading cause of traffic accidents. Currently, driver monitoring systems are typically installed in the center console or dashboard of the vehicle, with the driver's face in the center of the video frame. The system captures images of the driver's facial features through a camera, and by analyzing the images, it monitors whether the driver's eyelid opening is less than a certain threshold or whether the driver is yawning to determine whether the driver is fatigued and issues an alarm.

[0003] Before installing the driver monitoring system in a real vehicle, it is necessary to test the fatigue monitoring function of the driver monitoring system. The common method is to install the camera on a simulation test fixture, and the tester sits in the seat. After the position of the camera and the tester are adjusted, the tester simulates actions such as closing his eyes or yawning so that the camera can obtain images of the corresponding facial features and analyze them to determine whether the driver is in a state of fatigue. This training improves the accuracy of the driver monitoring system in monitoring fatigue.

[0004] Currently, the camera position adjustment range of traditional simulation testing fixtures is small, and they cannot accurately simulate the relative position and angle between the camera and the driver in a real vehicle. Therefore, the functional results obtained from the test will differ from the actual results, resulting in inadequate simulation training of the driver monitoring system. This can lead to false alarms or missed alarms about driver fatigue when the driver monitoring system is installed in a real vehicle. Summary of the Invention

[0005] In view of this, the present invention provides a test bench device and test method for a driver monitoring system, in order to solve the problem that the existing simulation test fixtures for driver monitoring systems cannot accurately simulate the relative position and angle between the camera and the driver in a real vehicle, resulting in inadequate simulation training of the driver monitoring system and the easy occurrence of false alarms or missed alarms of driver fatigue after the driver monitoring system is installed in a real vehicle.

[0006] In a first aspect, the present invention provides a test bench apparatus for a driver monitoring system, comprising: A test bench base used to simulate a vehicle cockpit; The seat assembly is mounted on the platform base; An image acquisition device is installed on the platform base, and the image acquisition device is used to acquire real-time facial image data of the driver on the seat assembly; A position adjustment mechanism is provided on the platform base to adjust the displacement of the image acquisition device in the X, Y and Z directions so that the relative distance between the optical center of the image acquisition device and the preset reference point of the seat assembly (200) in the X, Y and Z directions reaches a preset distance. An angle adjustment mechanism, disposed within the position adjustment mechanism, is used to adjust the angle of the image acquisition device so that the angle of the image acquisition device reaches a preset angle without changing the coordinate position of the optical center of the image acquisition device.

[0007] According to the present invention, a test bench device for a driver monitoring system has at least the following advantages: By setting a position adjustment mechanism on the test bench base, and including an angle adjustment mechanism on the position adjustment mechanism, and placing the image acquisition device on the angle adjustment mechanism, the image acquisition device can be adjusted flexibly in the X, Y, and Z directions according to its different postures in the vehicle's overall coordinate system (i.e., the different postures of the image acquisition device relative to the driver sitting in the vehicle's seat). This allows the relative distance between the optical center of the image acquisition device and a preset reference point of the seat assembly in the X, Y, and Z directions to reach a preset distance. This ensures that the position of the image acquisition device relative to the driver sitting in the seat assembly along the X, Y, and Z directions is essentially consistent with the position of the image acquisition device relative to the driver in the vehicle's overall coordinate system along the X, Y, and Z directions, more accurately reproducing the relative positional relationship between the image acquisition device and the driver in the simulated vehicle. Furthermore, the angle adjustment mechanism can be used to flexibly adjust the angle of the image acquisition device, allowing for more precise image acquisition. The angle of the image acquisition device reaches the preset angle, ensuring that the angle of the image acquisition device relative to the driver sitting on the seat assembly is basically consistent with the angle of the image acquisition device in the vehicle's overall coordinate system. This more accurately reproduces the angle of the image acquisition device relative to the driver sitting on the vehicle's seat. Simultaneously, during the adjustment of the image acquisition device's angle, the coordinates of the image acquisition device's optical center remain unchanged, ensuring that the relative distance of the image acquisition device's light spot to the preset reference point in the X, Y, and Z directions is not altered. This allows for precise simulation of the relative position and angle between the image acquisition device and the driver in the actual vehicle. Consequently, the fatigue monitoring results obtained by the driver monitoring system using this test bench are essentially consistent with the fatigue monitoring results obtained by the driver monitoring system installed in an actual vehicle. This ensures that the driver monitoring system tested using this test bench is less likely to falsely report or miss driver fatigue after being installed in an actual vehicle.

[0008] In one optional implementation, the angle adjustment mechanism includes: A support member is mounted on the position adjustment mechanism; Roll adjustment ring, around It is rotatably mounted on the support member and locked in place by the first locking member. It is positioned parallel to the width direction of the image acquisition device; Yaw control ring, around The rotatable support ring is rotatably mounted on the roll adjustment ring and locked in place by the second locking member. It is positioned parallel to the height direction of the image acquisition device; Pitch adjustment support ring, around The yaw adjustment support ring is rotatably mounted on it and locked in place by a third locking element. It is positioned parallel to the length direction of the image acquisition device; The image acquisition device is mounted on the pitch adjustment support ring, and the optical center of the image acquisition device coincides with the rotation center of the roll adjustment support ring, the yaw adjustment support ring, and the pitch adjustment support ring.

[0009] In one alternative embodiment, the first locking member includes a first bolt, and the roll adjustment ring extends along... A first through hole is provided through the first bolt, through which the shank of the first bolt passes. The rolling adjustment ring can rotate relative to the shank of the first bolt. The support member is provided with a first threaded hole corresponding to the position of the first through hole, and the first threaded hole matches the first bolt.

[0010] In one alternative embodiment, the second locking element includes a second bolt, the yaw adjustment ring along... A second through hole is provided through the bolt, which is used for the shank of the second bolt to pass through. The yaw adjustment ring can rotate relative to the shank of the second bolt. The roll adjustment ring is provided with a second threaded hole corresponding to the position of the second through hole, and the second threaded hole matches the second bolt.

[0011] In one alternative embodiment, the third locking element includes a third bolt, and the pitch adjustment ring extends along... A third through hole is provided for the shank of the third bolt to pass through, and the pitch adjustment support ring can rotate relative to the shank of the third bolt; the yaw adjustment support ring is provided with a third threaded hole corresponding to the position of the third through hole, and the third threaded hole matches the third bolt.

[0012] In one optional implementation, the position adjustment mechanism includes: The first adjusting member is slidably disposed on the platform base along the X direction and locked by the fourth locking member; The second adjusting member is slidably disposed on the first adjusting member along the Z direction and locked by the fifth locking member; The third adjusting member is slidably disposed on the second adjusting member along the Y direction and locked by the sixth locking member; The angle adjustment mechanism is located on the third adjustment member.

[0013] In one optional embodiment, two first adjusting members are provided, the two first adjusting members are spaced apart along the Y direction, and the second adjusting member is provided between the two first adjusting members; In one optional embodiment, the platform base is provided with a guide rail, which is arranged parallel to the X direction. The first adjusting member is slidably disposed on the guide rail along the X direction. The first adjusting member is provided with a fourth threaded hole. The fourth locking member includes a fourth bolt that matches the fourth threaded hole.

[0014] In one alternative embodiment, a light source is further included, the light source being disposed on the position adjustment mechanism, the position adjustment mechanism being used at least to adjust the position of the light source along the X direction; the light source is electrically connected to a brightness adjustment component, and the light source is used to simulate natural light and / or nighttime lighting.

[0015] In one optional embodiment, the light source is connected to the position adjustment mechanism via an angle adjustment component, which is used to adjust the yaw angle and pitch angle of the light source so that the angle of the light source reaches a preset angle.

[0016] In one optional embodiment, the light-emitting end of the light source is detachably provided with a light-shielding plate, which is used to change the shape of the light emitted by the light source.

[0017] In one optional embodiment, the platform base is provided with a mounting groove corresponding to the position of the seat assembly, and one end of the seat assembly facing the platform base is slidably disposed in the mounting groove along the Z direction and locked by a locking assembly.

[0018] Secondly, the present invention also provides a testing method applied to the test bench apparatus for a driver monitoring system provided in the first aspect above, the testing method comprising the following steps: Based on the attitude of the image acquisition device in the vehicle coordinate system under the design state, the yaw angle, pitch angle and roll angle of the image acquisition device are adjusted respectively by the angle adjustment mechanism; The driver sits in the seat assembly in a designed posture; The image acquisition device is activated to collect real-time facial image data of the driver sitting in the seat assembly, and the facial image data is sent to the controller; the controller analyzes the facial image data and determines whether the driver is fatigued.

[0019] According to a testing method of the present invention, at least the following beneficial effects are achieved: By setting a position adjustment mechanism on the test bench base, and including an angle adjustment mechanism on the position adjustment mechanism, and placing the image acquisition device on the angle adjustment mechanism, the posture of the image acquisition device in the vehicle coordinate system of the actual vehicle under different design states—that is, the posture of the image acquisition device relative to the driver sitting in the seat of the actual vehicle under different design states—can be flexibly adjusted by the position adjustment mechanism to adjust the displacement of the light spot of the image acquisition device in the X, Y, and Z directions. This ensures that the relative distance between the optical center of the image acquisition device and the preset reference point of the seat assembly in the X, Y, and Z directions reaches a preset distance. This makes the position of the image acquisition device relative to the driver sitting in the seat assembly in the X, Y, and Z directions essentially consistent with the position of the image acquisition device relative to the driver in the vehicle coordinate system of the actual vehicle in the X, Y, and Z directions, thus more accurately reproducing the image acquisition device and driver's position in the simulated vehicle. The relative position of the driver can be determined by adjusting the angle of the image acquisition device using an angle adjustment mechanism. This allows the image acquisition device to reach a preset angle, ensuring that the angle of the image acquisition device relative to the driver sitting on the seat assembly is essentially consistent with the angle of the image acquisition device in the vehicle's overall coordinate system. This more accurately reproduces the angle of the image acquisition device relative to the driver sitting on the vehicle's seat, thus precisely simulating the relative position and angle between the image acquisition device and the driver in the actual vehicle under different design conditions. This ensures that the fatigue monitoring results obtained by the driver monitoring system using this test bench and test method are essentially consistent with the fatigue monitoring results obtained by the driver monitoring system installed in the actual vehicle. This guarantees that the driver monitoring system tested using this method is less likely to falsely report or miss driver fatigue after being installed in the actual vehicle.

[0020] In one optional implementation, the formula for calculating the displacement of the image acquisition device in the X direction is:

[0021] In the formula, The preset distance in the X direction; In the initial state, the relative distance of the optical center with respect to the preset reference point in the X direction is denoted as . And / or, the formula for calculating the displacement of the image acquisition unit in the Y direction is:

[0022] In the formula, The preset distance in the Y direction; In the initial state, this is the relative distance of the optical center with respect to a preset reference point in the Y direction. And / or, the formula for calculating the displacement of the image acquisition unit in the Z direction is:

[0023] In the formula, The preset distance in the Z direction; Let be the relative distance of the optical center with respect to the preset reference point in the Z direction in the initial state. Attached Figure Description

[0024] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0025] Figure 1 This is a three-dimensional structural diagram of the test bench device in this embodiment; Figure 2 This is a schematic diagram of the assembly structure of the angle adjustment mechanism and the image acquisition unit in this embodiment; Figure 3 for Figure 2 A schematic diagram of the decomposed structure; Figure 4 This is a schematic diagram of the position adjustment mechanism in this embodiment; Figure 5 This is a schematic diagram of the seat assembly in this embodiment; Figure 6 This is a schematic diagram of the assembly structure of the light source and the angle adjustment component in this embodiment; Figure 7 for Figure 6 A schematic diagram of the decomposed structure; Figure 8 This is a schematic diagram of the structure of the platform base in this embodiment.

[0026] Explanation of reference numerals in the attached figures: 100 - Stand base; 110 - Mounting slot; 200 - Seat assembly, 210 - Connecting frame, 220 - Fixing bracket; 300 - Image acquisition unit; 310 - Clamping device; 400-Angle adjustment mechanism, 410-Support member, 411-Horizontal part, 412-Vertical part, 420-Roll adjustment support ring, 421-First through hole, 430-Yaw adjustment support ring, 431-Second through hole, 440-Pitch adjustment support ring, 441-Third through hole, 442-Horizontal section, 443-Circular arc section; 510 - First adjusting component, 520 - Second adjusting component, 530 - Third adjusting component, 540 - Guide rail; 600-Angle adjustment assembly, 610-Light source, 620-Mounting component, 630-First adjustment part, 631-Fourth through hole, 640-Second adjustment part, 651-Seventh screw, 652-Seventh nut, 660-Eighth bolt; 710 - First bolt hole, 720 - Locking part, 721 - Second bolt hole. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] In the description of this embodiment, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this embodiment and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this embodiment. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0029] In the description of this embodiment, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment according to the specific circumstances.

[0030] The following is combined Figures 1 to 8 The following describes embodiments of the present invention.

[0031] like Figures 1 to 3As shown, according to a first aspect of the present invention, a test bench apparatus for a driver monitoring system is provided, including a test bench base 100, a seat assembly 200, an image acquisition device 300, a position adjustment mechanism, and an angle adjustment mechanism 400. The test bench base 100 is used to simulate a vehicle cockpit; the seat assembly 200 is disposed on the test bench base 100 and is used to simulate a vehicle seat; the image acquisition device 300 is disposed on the test bench base 100, and is used to acquire real-time facial image data of the driver on the seat assembly 200, and can send the facial image data to a controller, which is used to analyze the data. The system analyzes real-time facial image data and determines whether the driver is fatigued. A position adjustment mechanism is installed on the platform base 100. The position adjustment mechanism is used to adjust the displacement of the image acquisition device 300 in the X, Y and Z directions so that the relative distance between the optical center of the image acquisition device 300 and the preset reference point of the seat assembly 200 in the X, Y and Z directions reaches a preset distance. An angle adjustment mechanism 400 is installed on the position adjustment mechanism. The angle adjustment mechanism 400 is used to adjust the angle of the image acquisition device 300 so that the angle of the image acquisition device 300 reaches a preset angle without changing the coordinate position of the optical center of the image acquisition device 300.

[0032] The test bench device in this embodiment, by setting a position adjustment mechanism on the bench base 100, and setting an angle adjustment mechanism 400 on the position adjustment mechanism, and mounting the image acquisition device 300 on the angle adjustment mechanism 400, can flexibly adjust the displacement of the light spot of the image acquisition device 300 in the X, Y, and Z directions according to the different postures of the image acquisition device 300 in the vehicle coordinate system of the actual vehicle, that is, the different postures of the image acquisition device 300 relative to the driver sitting in the seat of the actual vehicle. The relative distances of the image acquisition device 300 to the preset reference point (i.e., point H) of the seat assembly 200 in the X, Y, and Z directions reach preset distances. This ensures that the position of the image acquisition device 300 relative to the driver sitting on the seat assembly 200 along the X, Y, and Z directions is basically consistent with the position of the image acquisition device 300 relative to the driver along the X, Y, and Z directions in the vehicle coordinate system of the actual vehicle. This more accurately reproduces the relative positional relationship between the image acquisition device 300 and the driver in the simulated real vehicle. Furthermore, the angle adjustment mechanism 400 can be used to flexibly adjust the image acquisition device 300. The angle of the image acquisition device 300 is set to 0°, ensuring that the angle of the image acquisition device 300 relative to the driver sitting on the seat assembly 200 is basically consistent with the angle of the image acquisition device 300 in the vehicle coordinate system of the actual vehicle. This more accurately reproduces the angle of the image acquisition device 300 relative to the driver sitting on the seat of the actual vehicle. At the same time, the coordinates of the optical center of the image acquisition device 300 are not changed during the adjustment of the angle of the image acquisition device 300. This ensures that the relative distance of the light spot of the image acquisition device 300 to the preset reference point (point H) in the X, Y, and Z directions is not changed when the angle of the image acquisition device 300 is adjusted. This allows for accurate simulation of the relative position and angle between the image acquisition device 300 and the driver in the actual vehicle. As a result, the fatigue monitoring function results tested by the driver monitoring system using the test bench device of this embodiment are basically consistent with the fatigue monitoring function results tested by the driver monitoring system installed in the actual vehicle. This ensures that the driver monitoring system tested using the test bench device of this embodiment is less likely to falsely report or miss driver fatigue after being installed in the actual vehicle.

[0033] It should be noted that, since the fatigue monitoring function results tested by the driver monitoring system using the test bench device in this embodiment are basically consistent with the fatigue monitoring function results tested by the driver monitoring system installed in an actual vehicle, the early development of the fatigue monitoring function of the driver monitoring system can be completed with high accuracy without the need for an actual vehicle. This can reduce the investment cost in the early development of the fatigue monitoring function of the driver monitoring system and help improve market competitiveness.

[0034] It should be noted that, because the angle adjustment mechanism 400 is used in this embodiment to flexibly adjust the angle of the image acquisition device 300, and the position adjustment mechanism can be used to flexibly adjust the displacement of the light spot of the image acquisition device 300 in the X, Y and Z directions, the angle and relative position of the image acquisition device 300 in the vehicle coordinate system of the actual vehicle when the driver monitoring system is installed in different models can be accurately reproduced. Therefore, it is possible to use the same test bench device to carry out the early development of the fatigue monitoring function of the driver monitoring system installed in different models, and ensure the accuracy of the functional test. This can reduce the investment cost in the early stage of the development of the fatigue monitoring function of the driver monitoring system and help improve market competitiveness.

[0035] It is understandable that the image acquisition device 300 can be set as a camera, scanner or digital camera, etc.; the image acquisition device 300 can be set separately from the controller, and the two can be connected by communication or electricity; the image acquisition device 300 can also be set as an integral part of the controller.

[0036] It is understood that, in this text, the X direction is parallel to the length direction of the platform base 100, the Y direction is parallel to the width direction of the platform base 100, and the Z direction is parallel to the height direction of the platform base 100. For ease of description, this embodiment uses... Figure 1 The X, Y, and Z directions are used as descriptions in this text, but should not be interpreted as explicitly defining the length, width, and height of the platform base 100. When the yaw, pitch, and roll angles of the image acquisition device 300 are all 0°, the X direction and... Parallel in the direction of the Y direction, and parallel in the direction of the Y direction. The Z-axis is parallel to the Z-axis and parallel to the Z-axis. The directions are parallel.

[0037] It is understood that the upper surface of the test bench base 100 is the Z-direction reference of the side-view test bench device in this embodiment, simulating the floor inside a vehicle, and the test bench base 100 is in a fixed and unchangeable state.

[0038] It should be noted that the seat assembly 200 is positioned along the X-axis, and the position adjustment mechanism is located on the opposite left side of the seat assembly 200 along the X-axis. Here, "opposite left side" refers to... Figure 1 Described from a perspective.

[0039] It is understandable that point H refers to the reference point for the driver's position in the seat assembly 200, serving as a test point for adjusting the height of the seat assembly 200, and also as the reference point for the image acquisition device 300 in the X, Y, and Z directions.

[0040] like Figure 2 and Figure 3As shown, in some embodiments, the angle adjustment mechanism 400 includes a support member 410, a roll adjustment support ring 420, a yaw adjustment support ring 430, and a pitch adjustment support ring 440. The support member 410 is disposed on the position adjustment mechanism; the roll adjustment support ring 420 is wound around... The yaw adjustment ring 430 is rotatably mounted on the support member 410 and locked by the first locking member; The roll adjustment ring 420 is rotatably mounted on the roll adjustment ring 420 and locked by the second locking element; the pitch adjustment ring 440 rotates around... The yaw adjustment support ring 430 is rotated and locked by a third locking element; the image acquisition device 300 is positioned on the pitch adjustment support ring 440, with the optical center of the image acquisition device 300 coinciding with the rotation centers of the roll adjustment support ring 420, yaw adjustment support ring 430, and pitch adjustment support ring 440. With this configuration, during testing, based on the preset angle of the image acquisition device 300 in the vehicle's overall coordinate system under design conditions, the roll adjustment support ring 420 can be manually rotated around... Rotation allows the image acquisition unit 300 to be adjusted to the desired roll angle and locked by the first locking element; the yaw adjustment ring 430 can be manually rotated around... Rotation allows the image acquisition unit 300 to be adjusted to the desired yaw angle and locked by the second locking element; the pitch adjustment ring 440 can be manually rotated around... The image acquisition unit 300 is rotated to adjust to the required pitch angle and locked by the third locking element. This allows for manual stepless adjustment of the yaw, pitch, and roll angles of the image acquisition unit 300, accurately replicating the angles of the image acquisition unit 300 in the vehicle coordinate system when the driver monitoring system is installed in different vehicle models. This ensures that the angles of the image acquisition unit 300 reach the preset angles, guaranteeing that the fatigue monitoring results tested by the driver monitoring system using the test bench device of this embodiment are essentially consistent with the fatigue monitoring results tested by the driver monitoring system installed in a real vehicle. Furthermore, the process of adjusting the yaw, pitch, and roll angles of the image acquisition unit 300 in this embodiment does not require active drive components such as motors, cylinders, hydraulic cylinders, or electric telescopic components, simplifying the structure of the test bench device and reducing its cost. This, in turn, reduces the investment cost in developing the fatigue monitoring function of the driver monitoring system, thus improving market competitiveness.

[0041] It should be noted that an active drive unit refers to a device that can convert energy into mechanical motion through external energy sources (such as electrical energy, pneumatic energy, hydraulic energy, etc.).

[0042] It should be noted that the yaw angle, pitch angle, and roll angle of the image acquisition device 300 describe the rotation angle of the image acquisition device 300 in three-dimensional space; the yaw angle of the image acquisition device 300 refers to the rotation angle of the image acquisition device 300 about the vertical axis, describing the yaw angle of the image acquisition device 300 in the horizontal plane; the pitch angle of the image acquisition device 300 refers to the rotation angle of the image acquisition device 300 about the horizontal axis, describing the vertical tilt angle of the image acquisition device 300 in the vertical plane; and the roll angle of the image acquisition device 300 refers to the rotation angle of the image acquisition device 300 about its own axis, describing the side tilt angle of the image acquisition device 300 in the horizontal plane.

[0043] Understandably, in the text Parallel to the width direction of the image acquisition unit 300 Parallel to the length direction of the image acquisition device 300 Parallel to the height direction of the image acquisition device 300.

[0044] like Figure 3 As shown, specifically, the first locking element includes a first bolt, and the roll adjusting ring 420 along... A first through hole 421 is provided through the first bolt, through which the shank of the first bolt passes. The roll adjustment ring 420 can rotate relative to the shank of the first bolt. The support member 410 is provided with a first threaded hole corresponding to the position of the first through hole 421, and the first threaded hole matches the first bolt. With this configuration, after the first bolt is passed through the first through hole 421 and tightened into the first threaded hole, the head of the first bolt presses against the roll adjustment ring 420. The roll adjustment ring 420 is locked in place by the friction between the head of the first bolt and the roll adjustment ring 420, preventing it from rotating relative to the support member 410. When it is necessary to adjust the roll angle of the image acquisition unit 300, simply loosen the first bolt from the first threaded hole, disengaging the head of the first bolt from the roll adjustment ring 420, thus removing the friction between them. At this point, the roll adjustment ring 420 can rotate relative to the rod of the first bolt, allowing manual rotation of the roll adjustment ring 420. The image acquisition unit 300 is rotated to adjust to the required roll angle, and the entire process of adjusting the roll angle of the image acquisition unit 300 is convenient.

[0045] In another alternative embodiment of the above embodiment, the first locking member includes a matching first bolt and a first nut, and the roll adjusting ring 420 and the support member 410 are respectively along the roll adjustment ring 420 and the support member 410. A first through hole 421 is provided through the bolt, through which the shank of the first bolt passes. The roll adjustment ring 420 can rotate relative to the shank of the first bolt. When assembling and locking, the shank of the first bolt is passed through the first through hole 421 of the roll adjustment ring 420 and the support member 410, and then the first nut is tightened.

[0046] like Figure 2 and Figure 3 As shown, specifically, the second locking element includes a second bolt, and the yaw adjustment ring 430 is along... A second through hole 431 is provided through the bolt, through which the shank of the second bolt passes. The yaw adjustment ring 430 can rotate relative to the shank of the second bolt. The roll adjustment ring 420 is provided with a second threaded hole corresponding to the position of the second through hole 431, and the second threaded hole matches the second bolt. With this configuration, after the second bolt is passed through the second through hole 431 and tightened into the second threaded hole, the head of the second bolt presses against the yaw adjustment support ring 430. The friction between the head of the second bolt and the yaw adjustment support ring 430 locks the yaw adjustment support ring 430 in place, preventing it from rotating relative to the roll adjustment support ring 420. When adjusting the yaw angle of the image acquisition unit 300, simply loosen the second bolt from the second threaded hole, disengaging the head of the second bolt from the yaw adjustment support ring 430, thus removing the friction between them. At this point, the yaw adjustment support ring 430 can rotate relative to the rod of the second bolt, allowing manual rotation of the yaw adjustment support ring 430. The rotation allows the image acquisition unit 300 to be adjusted to the required yaw angle, making the entire process of adjusting the yaw angle of the image acquisition unit 300 convenient.

[0047] In another alternative embodiment of the above embodiment, the second locking member includes a matching second bolt and a second nut, with the yaw adjusting ring 430 and the roll adjusting ring 420 corresponding to each other. A second through hole 431 is provided through the second bolt, through which the shank of the second bolt passes. The yaw adjustment support ring 430 can rotate relative to the shank of the second bolt. When assembling and locking, the shank of the second bolt is passed through the second through hole 431 of the yaw adjustment support ring 430 and the roll adjustment support ring 420, and then the second nut is tightened.

[0048] like Figure 2 and Figure 3 As shown, specifically, the roll adjustment support ring 420 is arranged in a C-shape or semi-circular shape, and the yaw adjustment support ring 430 is arranged along... The two ends of the angle adjustment mechanism 400 are respectively connected to the beginning and end of the roll adjustment support ring 420 by the second bolt, thereby simplifying the structure of the angle adjustment mechanism 400, making the structure of the angle adjustment mechanism 400 more compact, and without affecting the effect of the image acquisition device 300 in acquiring real-time face image data.

[0049] like Figure 2 and Figure 3 As shown, specifically, the third locking element includes a third bolt, and the pitch adjustment ring 440 is along... A third through hole 441 is provided, which is used for the shank of the third bolt to pass through. The pitch adjustment support ring 440 can rotate relative to the shank of the third bolt. The yaw adjustment support ring 430 is provided with a third threaded hole at the position corresponding to the third through hole 441. The third threaded hole matches the third bolt. With this configuration, after the third bolt is passed through the third through hole 441 and tightened into the third threaded hole, the head of the third bolt presses against the pitch adjustment support ring 440. The friction between the head of the third bolt and the pitch adjustment support ring 440 locks the ring, preventing it from rotating relative to the yaw adjustment support ring 430. When adjusting the pitch angle of the image acquisition unit 300, simply loosen the third bolt from the third threaded hole, disengaging the head of the third bolt from the pitch adjustment support ring 440, thus removing the friction between them. At this point, the pitch adjustment support ring 440 can rotate relative to the rod of the third bolt, allowing manual rotation of the ring. The image acquisition device 300 is rotated to adjust to the required pitch angle, and the entire process of adjusting the pitch angle of the image acquisition device 300 is convenient.

[0050] In another alternative embodiment of the above embodiment, the third locking member includes a matching third bolt and a third nut, with the pitch adjustment ring 440 and the yaw adjustment ring 430 corresponding to each other along the [path]. A third through hole 441 is provided through the third bolt, through which the shank of the third bolt passes. The pitch adjustment support ring 440 can rotate relative to the shank of the third bolt. When assembling and locking, the shank of the third bolt is passed through the third through hole 441 of the pitch adjustment support ring 440 and the yaw adjustment support ring 430, and then the third nut is tightened.

[0051] like Figure 3 As shown, specifically, the pitch adjustment support ring 440 includes a horizontal section 442 and arc sections 443 disposed at both ends of the horizontal section 442. Each arc section 443 is provided with a third through hole 441. The horizontal section 442 is parallel to... In this configuration, the image acquisition unit 300 is detachably mounted on the horizontal section 442. With this configuration, the pitch adjustment support ring 440 is rotatably connected to the yaw adjustment support ring 430 via two arc sections 443. Compared to a single-arm support structure, this configuration is more conducive to manual adjustment of the image acquisition unit 300. The system allows for smooth rotation, and the pitch adjustment ring 440 provides more space for the tester to tighten or loosen the second bolt, as well as more space for the tester to detach and install the image acquisition device 300 onto the horizontal section 442. Furthermore, by detachably connecting the image acquisition device 300 to the horizontal section 442, it facilitates the removal and storage of the image acquisition device 300 after testing.

[0052] like Figure 2 and Figure 3 As shown, specifically, the end of the horizontal segment 442 facing the image acquisition device 300 is connected to a clamping frame 310 by bolts or screws, and the image acquisition device 300 is clamped between the clamping frame 310 and the horizontal segment 442.

[0053] In another alternative embodiment of the above embodiment, the side wall of the image acquisition unit 300 is provided with a connector, and the connector is provided with a mounting hole through which a screw is passed and screwed into the threaded hole of the horizontal section 442.

[0054] It should be noted that the yaw adjustment support ring 430 is rotatably mounted inside the roll adjustment support ring 420 via the second bolt and can be locked by the second bolt; the pitch adjustment support ring 440 is rotatably mounted inside the yaw adjustment support ring 430 via the third bolt and can be locked by the third bolt. The image acquisition unit 300 is detachably connected to the pitch adjustment support ring 440, so that the various components are nested together, thereby making the structure of the angle adjustment mechanism 400 more compact and occupying less space.

[0055] It should be noted that the optical center of the image acquisition unit 300 overlaps with the rotation centers of the roll adjustment support ring 420, yaw adjustment support ring 430, and pitch adjustment support ring 440. That is, the intersection of the rotation axes of the roll adjustment support ring 420, yaw adjustment support ring 430, and pitch adjustment support ring 440 overlaps with the optical center of the image acquisition unit 300. Therefore, adjusting the yaw, pitch, and roll angles of the image acquisition unit 300 will not change the position of its optical center relative to the vehicle coordinate system; in other words, adjusting the yaw, pitch, and roll angles of the image acquisition unit 300 will not change the coordinate position of its optical center. When the image acquisition unit 300 is in its initial position, its yaw, pitch, and roll angles are all 0°.

[0056] It should be noted that the compressive deformation force of each adjusting ring should be much greater than the preload applied by the corresponding locking component to prevent deformation of each adjusting ring.

[0057] like Figure 1 and Figure 2 As shown, specifically, the support member 410 is L-shaped, and the horizontal part 411 of the support member 410 is detachably connected to the platform base 100 by screws or bolts. The pitch adjustment ring 440 is wrapped around... The vertical portion 412 of the support member 410 is rotatably mounted on the support member 410. The horizontal portion 411 of the support member 410 increases the connection area between the support member 410 and the test bench base 100. The roll adjustment ring 420, yaw adjustment ring 430, and pitch adjustment ring 440 are located directly above the horizontal section 442 of the support member 410. This improves the connection stability between the support member 410 and the test bench base 100 without increasing the space occupied by the assembly. At the same time, by detachably connecting the support member 410 to the test bench base 100, it is convenient to remove the angle adjustment mechanism 400 separately after the test is completed, and then remove each component of the angle adjustment mechanism 400 and the image acquisition device 300 separately for storage.

[0058] like Figure 1 and Figure 4As shown, in some embodiments, the position adjustment mechanism includes a first adjustment member 510, a second adjustment member 520, and a third adjustment member 530. The first adjustment member 510 is slidably disposed on the platform base 100 along the X direction and locked by a fourth locking member; the second adjustment member 520 is slidably disposed on the first adjustment member 510 along the Z direction and locked by a fifth locking member; the third adjustment member 530 is slidably disposed on the second adjustment member 520 along the Y direction and locked by a sixth locking member; and the angle adjustment mechanism 400 is disposed on the third adjustment member 530. With this setup, during testing, based on the relative position of the image acquisition unit 300 to the driver sitting in the actual vehicle seat in the design state, the fourth locking member can be manually unlocked, and the first adjusting member 510 can be manually slid along the X direction to adjust the image acquisition unit 300 to the desired position along the X direction before manually locking the fourth locking member; the fifth locking member can be manually unlocked, and the second adjusting member 520 can be manually slid relative to the first adjusting member 510 along the Z direction to adjust the image acquisition unit 300 to the desired position along the Z direction before manually locking the fifth locking member; the sixth locking member can be manually unlocked. The third adjusting member 530 is manually slid relative to the second adjusting member 520 along the Y direction, adjusting the image acquisition device 300 to the required position along the Y direction, and then the sixth locking member is manually locked. This allows for stepless manual adjustment of the position of the image acquisition device 300 relative to the seat assembly 200 along the X, Y, and Z directions, accurately replicating the relative positional relationship between the image acquisition device 300 and the driver in a simulated real vehicle. This ensures that the fatigue monitoring results tested by the driver monitoring system using the test bench device of this embodiment are basically consistent with the fatigue monitoring results tested by the driver monitoring system installed in a real vehicle. Furthermore, the process of adjusting the position of the image acquisition device 300 relative to the seat assembly 200 along the X, Y, and Z directions in this embodiment does not require active drive components such as motors, cylinders, hydraulic cylinders, or electric telescopic components, simplifying the structure of the test bench device and reducing its cost. This, in turn, reduces the investment cost in developing the fatigue monitoring function of the driver monitoring system, thus improving market competitiveness.

[0059] like Figure 1 As shown, specifically, the horizontal portion 411 of the support member 410 is detachably connected to the third adjusting member 530 by screws or bolts.

[0060] like Figure 4 As shown, specifically, there are two first adjusting members 510, which are spaced apart along the Y direction, and a second adjusting member 520 is disposed between the two first adjusting members 510. With this arrangement, compared to setting the second adjusting member 520 as a single-support cantilever structure, this embodiment supports both ends of the second adjusting member 520 with two first adjusting members 510, which better ensures stability.

[0061] like Figure 1 and Figure 4 As shown, specifically, the platform base 100 is provided with a guide rail 540, which is parallel to the X-direction. A first adjusting member 510 is slidably disposed on the guide rail 540 along the X-direction. The first adjusting member 510 has a fourth threaded hole through it, and the fourth locking member includes a fourth bolt that matches the fourth threaded hole. With this arrangement, when it is necessary to move the first adjusting member 510 relative to the guide rail 540 along the X-direction, it is only necessary to loosen the fourth bolt in the fourth threaded hole, so that the tip of the fourth bolt separates from the guide rail 540, thereby removing the locking force applied between the first adjusting member 510 and the guide rail 540. After the first adjusting member 510 is moved relative to the guide rail 540 along the X-direction to the desired position, it is only necessary to tighten the fourth bolt in the fourth threaded hole, so that the tip of the fourth bolt abuts against the guide rail 540, and the friction between the tip of the fourth bolt and the guide rail 540 locks the first adjusting member 510 and the guide rail 540 together. The entire relative position adjustment process is simple to operate.

[0062] It is understandable that the tip of the fourth bolt refers to the end of the fourth bolt that is away from the head of the fourth bolt.

[0063] Specifically, both the first adjusting member 510 and the second adjusting member 520 are aluminum profile guide rails. More specifically, the first adjusting member 510 has a first sliding groove on the side facing the second adjusting member 520, and the second adjusting member 520 is slidably disposed in the first sliding groove on the side facing the first adjusting member 510; the second adjusting member 520 has a second sliding groove on the side facing the third adjusting member 530, and the third adjusting member 530 is slidably disposed in the second sliding groove on the side facing the second adjusting member 520.

[0064] Specifically, the second adjusting member 520 is provided with a fifth threaded hole, and the fifth locking member includes a fifth bolt that matches the fifth threaded hole. With this arrangement, when it is necessary to move the second adjusting member 520 relative to the first adjusting member 510 in the Z direction, it is only necessary to loosen the fifth bolt in the fifth threaded hole so that the tip of the fifth bolt separates from the first adjusting member 510, thereby removing the locking force applied between the second adjusting member 520 and the first adjusting member 510. After the second adjusting member 520 is moved relative to the first adjusting member 510 in the Z direction to the desired position, it is only necessary to tighten the fifth bolt in the fifth threaded hole so that the tip of the fifth bolt abuts against the first adjusting member 510, and the friction between the tip of the fifth bolt and the first adjusting member 510 locks the second adjusting member 520 and the first adjusting member 510 into one unit. The entire relative position adjustment process is simple to operate.

[0065] It is understandable that the tip of the fifth bolt refers to the end of the fifth bolt that is away from the head of the fifth bolt.

[0066] In a specific application, the second adjusting member 520 is slidably disposed on the side of the seat assembly 200 away from the seat assembly 200 along the X direction to the first adjusting member 510; in other embodiments, the second adjusting member 520 may also be slidably disposed on the end face of the first adjusting member 510 along the Y direction.

[0067] Specifically, the third adjusting member 530 is provided with a sixth threaded hole, and the sixth locking member includes a sixth bolt that matches the sixth threaded hole. With this arrangement, when it is necessary to move the third adjusting member 530 relative to the second adjusting member 520 in the Y direction, it is only necessary to loosen the sixth bolt in the sixth threaded hole so that the tip of the sixth bolt separates from the second adjusting member 520, thereby removing the locking force applied between the third adjusting member 530 and the second adjusting member 520. After the third adjusting member 530 is moved relative to the second adjusting member 520 in the Y direction to the desired position, it is only necessary to tighten the sixth bolt in the sixth threaded hole so that the tip of the sixth bolt abuts against the second adjusting member 520, and the friction between the tip of the sixth bolt and the second adjusting member 520 locks the third adjusting member 530 and the second adjusting member 520 into one unit. The entire relative position adjustment process is simple to operate.

[0068] It is understandable that the tip of the sixth bolt refers to the end of the sixth bolt that is away from the head of the sixth bolt.

[0069] In a specific application, the third adjusting member 530 is slidably disposed on the second adjusting member 520 at one end facing the second adjusting member 520 along the Z direction; in other embodiments, the third adjusting member 530 can also be slidably disposed on the second adjusting member 520 at one side facing the second adjusting member 520 along the X direction.

[0070] like Figure 1 , Figure 6 and Figure 7As shown, in some embodiments, the test bench device further includes a light source 610, which is disposed on the position adjustment mechanism. Preferably, the light source 610 is disposed on the upper end of the first adjustment member 510. The light source 610 is electrically connected to a brightness adjustment component and is used to simulate natural light and nighttime lighting. With this configuration, the light source 610 emits light simulating natural light or nighttime lighting to illuminate the face of the driver sitting on the seat assembly 200, and the brightness adjustment component flexibly adjusts the intensity of the light emitted by the light source 610, more accurately reproducing the actual lighting scene where the driver is sitting on the seat of the actual vehicle. This not only helps to ensure that the fatigue monitoring function results tested in the early stage of the driver monitoring system development are basically consistent with the fatigue monitoring function results tested when the driver monitoring system is installed in the actual vehicle, but also allows for more accurate reproduction of the specific environment problems that occur after the driver monitoring system is installed in the actual vehicle in the later stage of development. This improves the efficiency of reproducing, analyzing and solving the problems in the specific environment and finally verifying them, thereby increasing the speed of problem optimization and iteration in the later stage of driver monitoring system development.

[0071] It should be noted that the driver monitoring system was designed for real-vehicle testing in its later stages of development. The system was installed on a real vehicle for functional testing to identify problems in specific environments (such as direct sunlight on a person's face in the morning, causing uneven lighting, abnormal image recognition, and false or missed reports of driver fatigue; or strong headlights on a person's face at night, causing false or missed reports of driver fatigue).

[0072] In practical applications, there are two first adjustment components 510 and two corresponding light sources 610.

[0073] In specific applications, the light source 610 can also be set in the second adjusting member 520 or the third adjusting member 530.

[0074] Understandably, the light source 610 can be configured as a searchlight, a dimmable light, or a spotlight, etc.

[0075] It should be noted that the light source 610 is positioned at a height no lower than the highest position of the second adjustment member 520 relative to the first adjustment member 510 along the Z direction, in order to avoid interference.

[0076] Understandably, the light source 610 is connected to a switch, which allows the light source 610 to switch back and forth between emitting light that simulates natural light and emitting light that simulates nighttime lighting.

[0077] Specifically, the light-emitting end of the light source 610 is detachably equipped with a light-shielding plate, which is used to change the shape of the light emitted by the light source 610 to simulate the actual lighting scene of driving in different directions.

[0078] Understandably, different shapes of perforations are provided on different light shields, so that the light emitted by the light source 610 is emitted in different shapes.

[0079] Specifically, the light-shielding plate is set at the light-emitting end of the light source 610 through threaded connection, snap-fit ​​structure, etc.

[0080] like Figure 1 , Figure 6 and Figure 7 Specifically, the light source 610 is connected to the position adjustment mechanism via an angle adjustment component 600. The angle adjustment component 600 is used to adjust the yaw and pitch angles of the light source 610 so that the angle of the light source 610 reaches a preset angle. This configuration allows for more flexible adjustment of the angle of the light source 610 relative to the driver sitting on the seat assembly 200, enabling multi-angle illumination and more accurately reproducing the actual lighting scenario experienced by the driver while seated in the vehicle. This not only helps ensure that the fatigue monitoring results tested in the early stages of the driver monitoring system development are largely consistent with the fatigue monitoring results tested in the actual vehicle, but also accelerates the speed of problem optimization and iteration in the later stages of the driver monitoring system development.

[0081] like Figure 6 and Figure 7As shown, in some embodiments, the angle adjustment assembly 600 includes a mounting member 620, a first adjusting member 510, and a second adjusting member 520. The mounting member 620 is disposed on the position adjustment mechanism. Preferably, the mounting member 620 is disposed on the upper end of the first adjusting member 510. The first adjusting part 630 is rotatably disposed on the mounting member 620 about the Y direction and locked by a seventh locking member. The second adjusting part 640 is rotatably disposed on the first adjusting part 630 about the Z direction and locked by an eighth locking member. The light source 610 is disposed on the second adjusting part 640. With this setup, during testing, based on the posture of the light source 610 relative to the driver sitting in the vehicle's seat in the vehicle's overall coordinate system under the design state, the first adjustment part 630 can be manually rotated around the Y direction to adjust the light source 610 to the required pitch angle and lock it in place by the seventh locking member; the second adjustment part 520 can be manually rotated around the Z direction to adjust the light source 610 to the required yaw angle and lock it in place by the eighth locking member; thus, the yaw and pitch angles of the light source 610 can be manually and steplessly adjusted, accurately reproducing different actual lighting scenarios for the driver sitting in the vehicle's seat. This not only helps to ensure that the fatigue monitoring function results tested in the early stages of the driver monitoring system development are basically consistent with the fatigue monitoring function results tested in the actual vehicle, but also improves the speed of problem optimization and iteration in the later stages of the driver monitoring system development. Meanwhile, the process of adjusting the yaw and pitch angles of the light source 610 in this embodiment does not require active drive components such as motors, cylinders, hydraulic cylinders, and electric telescopic components, which simplifies the structure of the test bench device in this embodiment, thereby reducing the cost of the test bench device in this embodiment, and further reducing the investment cost in developing the fatigue monitoring function of the driver monitoring system, which is conducive to improving market competitiveness.

[0082] like Figure 7As shown, specifically, the seventh locking component includes a seventh screw 651, a first adjusting part 630, and a mounting part 620, both of which have a fourth through hole 631 extending along the Y direction. The fourth through hole 631 allows the seventh screw 651 to pass through. The first adjusting part 630 is rotatable relative to the seventh screw 651. A seventh nut 652 is threaded onto each end of the seventh screw 651. With this configuration, during assembly and locking, the seventh screw 651 is passed through the fourth through hole 631 of the first adjusting part 630 and the mounting part 620. Then, a seventh nut 652 is screwed onto each end of the seventh screw 651, causing the two seventh nuts 652 to press against the first adjusting part 630 and the mounting part 620, which are opposite to each other along the Y direction. On the side, after the first adjusting part 630 is locked by the friction between the seventh nut 652 and the first adjusting part 630 and the friction between the first adjusting part 630 and the mounting part 620, the first adjusting part 630 cannot rotate relative to the mounting part 620. When it is necessary to adjust the pitch angle of the light source 610, simply loosen the seventh nut 652 that is abutting and tightened against the first adjusting part 630, thereby removing the friction between the first adjusting part 630 and the mounting part 620. At this time, the first adjusting part 630 can rotate relative to the seventh screw 651, so that the yaw adjustment support ring 430 can be manually rotated around the Y direction, so that the light source 610 is adjusted to the required pitch angle. The whole process of adjusting the pitch angle of the light source 610 is convenient to operate.

[0083] In another alternative embodiment of the above embodiment, the seventh locking member includes a seventh bolt, and the yaw adjustment support ring 430 is provided with a fourth through hole 631 along the Z direction. The fourth through hole 631 is used for the shank of the seventh bolt to pass through, and the first adjustment part 630 can rotate relative to the shank of the seventh bolt. The mounting member 620 is provided with a seventh threaded hole at the position corresponding to the fourth through hole 631, and the seventh threaded hole matches the seventh bolt.

[0084] In another alternative embodiment of the above embodiments, the seventh locking member includes a matching second bolt and a seventh nut 652. The first adjusting part 630 and the mounting part 620 are provided with a fourth through hole 631 along the Y direction. The fourth through hole 631 is used for the shank of the seventh bolt to pass through. The first adjusting part 630 can rotate relative to the shank of the seventh bolt. When assembling and locking, the shank of the seventh bolt is passed through the seventh through hole of the first adjusting part 630 and the mounting part 620, and then the seventh nut 652 is tightened.

[0085] Such as 6 and Figure 7As shown, specifically, the end face of the first adjusting part 630 facing the second adjusting part 640 is recessed with a rotating groove, and the end of the second adjusting part 640 facing the first adjusting part 630 along the Z direction is rotatably disposed in the rotating groove; the side wall of the first adjusting part 630 is provided with an eighth threaded hole, which communicates with the rotating groove; the eighth locking member includes an eighth bolt 660 that matches the eighth threaded hole. With this configuration, when the yaw angle of the light source 610 needs to be adjusted, simply loosen the eighth bolt 660 in the eighth threaded hole, so that the tip of the eighth bolt 660 separates from the outer wall of the portion of the second adjustment part 640 extending into the rotating groove. This removes the locking force applied between the first adjustment part 630 and the second adjustment part 640, allowing the second adjustment part 640 to be manually rotated around the Z-axis. After adjusting the light source 610 to the desired yaw angle, simply tighten the eighth bolt 660 in the eighth threaded hole, so that the tip of the eighth bolt 660 abuts against the outer wall of the portion of the second adjustment part 640 extending into the rotating groove. The friction between the tip of the eighth bolt 660 and the second adjustment part 640 locks the first adjustment part 630 and the second adjustment part 640 together. The entire adjustment process is simple to operate.

[0086] It is understandable that the tip of the eighth bolt 660 refers to the end of the eighth bolt 660 that is away from the head of the bolt.

[0087] like Figure 1 , Figure 5 and Figure 8 As shown, in some embodiments, the test bench 100 is provided with a mounting groove 110 corresponding to the position of the seat assembly 200. One end of the seat assembly 200 facing the test bench 100 is slidably disposed in the mounting groove 110 along the Z direction and locked by a locking assembly. With this arrangement, the height position of the seat assembly 200 along the Z direction can be flexibly adjusted according to the height position of the seat assembly 200 at the work position H point (i.e., the preset reference point) for the driver to sit in under different design states relative to the upper surface of the test bench 100 (i.e., the floor of the actual vehicle). This ensures that the height position of the H point relative to the upper surface of the test bench 100 is basically consistent with the height position of the actual vehicle seat relative to the floor in the vehicle coordinate system. This accurately simulates the relative position of the image acquisition device 300 and the driver in the actual vehicle, so that the fatigue monitoring function results tested by the driver monitoring system using the test bench device of this embodiment are basically consistent with the fatigue monitoring function results tested by the driver monitoring system installed in the actual vehicle.

[0088] It should be noted that the initial position is when the seat assembly is lowered to its lowest point (200). The initial position, point H, is at a height of [missing information]. .

[0089] like Figure 1 and Figure 5As shown, specifically, a connecting seat is provided at one end of the seat assembly 200 facing the frame base 100, and the connecting seat is slidably disposed in the mounting groove 110 along the Z direction; the locking assembly includes a locking bolt and a plurality of first bolt holes 710, which are spaced apart along the Z direction on the connecting seat; a locking part 720 is provided on the upper surface of the frame base 100, and a second bolt hole 721 is provided at the position of one of the first bolt holes 710 in the locking part 720; the locking bolt is used to pass through the second bolt hole 721 and the corresponding first bolt hole 710, and the portion of the locking bolt extending out of the first bolt hole 710 is threaded to connect to the locking nut; with this arrangement, by adjusting the alignment of the first bolt hole 710 and the second bolt hole 721 at different height positions in the Z direction, and by cooperating with the locking bolt and the locking nut, the height position of the seat assembly 200 along the Z direction can be flexibly adjusted.

[0090] In specific applications, the number of first bolt holes 710 can be reasonably selected based on the height range and adjustment precision of the seat assembly 200 relative to the upper surface of the platform base 100 as needed.

[0091] like Figure 5 As shown, specifically, the connecting seat includes four connecting brackets 210 located at the four corner positions of the bottom of the seat assembly 200, and each connecting bracket 210 is provided with a plurality of first bolt holes 710 at intervals along the Z direction.

[0092] like Figure 5 As shown, specifically, a fixing bracket 220 is provided at the bottom of the seat assembly 200. The fixing bracket 220 is connected to the connecting seat by bolts or screws, thereby facilitating the disassembly and assembly of the seat assembly 200.

[0093] like Figures 1 to 8 As shown, according to a second aspect of the present invention, a testing method is also provided, applied to the test bench apparatus for a driver monitoring system provided in the first aspect of the present invention. The testing method includes the following steps: The position adjustment mechanism adjusts the displacement of the image acquisition unit 300 in the X, Y and Z directions so that the relative distance between the optical center of the image acquisition unit 300 and the preset reference point of the seat assembly 200 in the X, Y and Z directions reaches a preset distance. The angle of the image acquisition device 300 is adjusted by the angle adjustment component so that the angle of the image acquisition device 300 reaches the preset angle without changing the coordinate position of the optical center of the image acquisition device 300. The image acquisition device 300 is activated to collect real-time facial image data of the driver sitting on the seat assembly 200 and sends the facial image data to the controller; the controller analyzes the facial image data and determines whether the driver is fatigued.

[0094] The testing method in this embodiment uses a position adjustment mechanism on the test bench base 100, which includes an angle adjustment mechanism 400. The image acquisition device 300 is mounted on the angle adjustment mechanism 400. Based on the orientation of the image acquisition device 300 in the vehicle's coordinate system under different design states—that is, the orientation of the image acquisition device 300 relative to the driver sitting in the vehicle's seat—the position adjustment mechanism can flexibly adjust the displacement of the image acquisition device 300's light spot in the X, Y, and Z directions. This ensures that the relative distance between the optical center of the image acquisition device 300 and the preset reference point (H point) of the seat assembly 200 in the X, Y, and Z directions reaches a preset distance. This ensures that the position of the image acquisition device 300 relative to the driver sitting in the seat assembly 200 along the X, Y, and Z directions is essentially consistent with the position of the image acquisition device 300 relative to the driver in the vehicle's coordinate system along the X, Y, and Z directions, thus more accurately reproducing the simulated vehicle. The relative position of the image acquisition device 300 and the driver can be determined. An angle adjustment mechanism 400 can be used to flexibly adjust the angle of the image acquisition device 300, ensuring that the angle of the image acquisition device 300 relative to the driver sitting on the seat assembly 200 is essentially consistent with the angle of the image acquisition device 300 in the vehicle's overall coordinate system. This more accurately reproduces the angle of the image acquisition device 300 relative to the driver sitting in the vehicle's seat, thus precisely simulating the relative position and angle of the image acquisition device 300 and the driver in different design states in the actual vehicle. This ensures that the fatigue monitoring results tested by the driver monitoring system using the test bench device and the side-view method of this embodiment are essentially consistent with the fatigue monitoring results tested by the driver monitoring system installed in the actual vehicle. This guarantees that the driver monitoring system tested using the side-view method of this embodiment is less likely to falsely report or miss driver fatigue after being installed in the actual vehicle.

[0095] It should be noted that before the test begins, the hardware and software testing environment must be connected, the equipment must be powered, and the test bench must be adjusted to meet the requirements of the test item before the test can begin.

[0096] In some embodiments, adjusting the angle of the image acquisition device 300 using the angle adjustment component specifically includes the following steps: Manually rotate the roll adjustment ring 420 turns The image acquisition unit 300 is rotated to adjust to the required roll angle and locked by the first locking element. Manually rotate the yaw adjustment ring 430 turns The image acquisition unit 300 is rotated to adjust to the required yaw angle and locked by the second locking element. Manually rotate the pitch adjustment ring 440 degrees. The image acquisition unit 300 is rotated to adjust to the required pitch angle and locked by the third locking element.

[0097] The testing method in this embodiment accurately reproduces the angles of the image acquisition unit 300 in the vehicle coordinate system of real vehicles when the driver monitoring system is installed on different models by manually and steplessly adjusting the yaw, pitch, and roll angles of the image acquisition unit 300. This ensures that the fatigue monitoring results obtained by the driver monitoring system using the test bench device of this embodiment are basically consistent with the fatigue monitoring results obtained by the driver monitoring system when installed on a real vehicle. Furthermore, the process of adjusting the yaw, pitch, and roll angles of the image acquisition unit 300 in this embodiment does not require active drive components such as motors, cylinders, hydraulic cylinders, or electric telescopic components, simplifying the structure of the test bench device and reducing its cost. This, in turn, reduces the investment cost in developing the fatigue monitoring function of the driver monitoring system, thus improving its market competitiveness.

[0098] It should be noted that since the yaw angle, pitch angle and roll angle of the image acquisition device 300 are all 0° when the image acquisition device 300 is in the initial position, it can be directly adjusted according to the design angle (i.e. the preset angle) to ultimately meet the actual angle requirements.

[0099] In some embodiments, the platform base 100 is provided with a mounting groove 110 corresponding to the position of the seat assembly 200, and one end of the seat assembly 200 facing the platform base 100 is slidably disposed in the mounting groove 110 along the Z direction and locked by a locking assembly; before the driver sits on the seat assembly 200 in the designed posture, the following steps are also included: Based on the preset reference point (i.e., point H) of the driver's position in the seat assembly 200 under the design state, the height relative to the upper surface of the platform base 100. Move the seat assembly 200 upwards along the Z direction. The displacement is fixed by locking components; The following formula is used to obtain it: ,in The height of point H is when the seat assembly 200 is lowered to its lowest position.

[0100] The testing method in this embodiment flexibly adjusts the height position of the seat assembly 200 along the Z-direction based on the height position of the seat assembly 200 for the driver's seat relative to the upper surface of the test bench base 100 (i.e., the floor of the actual vehicle) under different design states. This ensures that the height position of the seat assembly 200 relative to the upper surface of the test bench base 100 is basically consistent with the height position of the actual vehicle seat relative to the floor in the vehicle's overall coordinate system. This accurately simulates the relative position of the image acquisition device 300 and the driver in the actual vehicle, so that the fatigue monitoring function results tested by the driver monitoring system using the side-view method of this embodiment are basically consistent with the fatigue monitoring function results tested by the driver monitoring system installed in the actual vehicle.

[0101] In some embodiments, adjusting the displacement of the image acquisition unit 300 in the X, Y, and Z directions via a position adjustment mechanism specifically includes the following steps: Based on the position information of the optical center of the image acquisition device 300 relative to the preset reference point (i.e., point H) of the driver's position in the seat assembly 200 under the design state, the position information specifically includes the preset distance in the X direction between the optical center of the image acquisition device 300 and point H. The optical center position of the image acquisition device 300 is at a preset distance from point H in the Y direction. The optical center position of the image acquisition device 300 is at a preset distance from point H in the Z direction. ; Manually unlock the fourth locking element and manually slide the first adjusting element 510 along the X direction. After determining the displacement, manually tighten the fourth locking component; The following formula is used to obtain it: ,in In the initial state, the relative distance of the optical center with respect to the preset reference point in the X direction is denoted as . Manually unlock the fifth locking member and manually slide the second adjusting member 520 relative to the first adjusting member 510 along the Z direction. After determining the displacement, manually tighten the fifth locking component; The following formula is used to obtain it: ,in In the initial state, the relative distance of the optical center with respect to the preset reference point in the Z direction; Manually unlock the sixth locking member and manually slide the third adjusting member 530 relative to the second adjusting member 520 along the Y direction. After determining the displacement, manually tighten the sixth locking component; The following formula is used to obtain it: ,in Let be the relative distance of the optical center with respect to the preset reference point in the Y direction in the initial state.

[0102] The testing method in this embodiment accurately replicates the relative position of the image acquisition unit 300 to the seat assembly 200 along the X, Y, and Z directions by manually and steplessly adjusting the position of the image acquisition unit 300 relative to the driver in a simulated real vehicle. This ensures that the fatigue monitoring results obtained by the driver monitoring system using the test bench device of this embodiment are essentially consistent with the fatigue monitoring results obtained by the driver monitoring system when installed in a real vehicle. Furthermore, the process of adjusting the position of the image acquisition unit 300 relative to the seat assembly 200 along the X, Y, and Z directions in this embodiment does not require active drive components such as motors, cylinders, hydraulic cylinders, or electric telescopic components. This simplifies the structure of the test bench device, reduces its cost, and consequently reduces the investment cost in developing the fatigue monitoring function of the driver monitoring system, thus enhancing its market competitiveness.

[0103] In some embodiments, the test bench device further includes a light source 610, which is disposed on the position adjustment mechanism. Preferably, the light source 610 is disposed on the upper end of the first adjustment member 510. The light source 610 is electrically connected to a brightness adjustment component and is used to simulate natural light and nighttime lighting. Before starting the image acquisition device 300 to acquire real-time facial image data of the driver sitting on the seat assembly 200, the following steps are also included: According to the actual lighting scene to be simulated under the design state, install the corresponding light shield at the light-emitting end of the light source 610, and adjust the light emitted by the light source 610 to the required brightness; The yaw angle and pitch angle of the light source 610 are adjusted by the angle adjustment component 600, so that the light source 610 is adjusted to the attitude of the design state.

[0104] The side-view method of this embodiment can more flexibly adjust the posture of the light source 610 relative to the driver sitting on the seat assembly 200, realize multi-angle illumination function, and more accurately reproduce the actual lighting scene where the driver is sitting on the seat of the real vehicle; it can not only make it easier to ensure that the fatigue monitoring function results tested in the early stage of the driver monitoring system development are basically consistent with the fatigue monitoring function results tested in the real vehicle, but also improve the speed of problem optimization and iteration in the later stage of the driver monitoring system development.

[0105] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the present invention.

Claims

1. A test bench device for a driver monitoring system, characterized in that, include: A test bench base (100) is used to simulate a vehicle cockpit; Seat assembly (200) is disposed on the platform base (100); An image acquisition device (300) is disposed on the platform base (100) and is used to acquire real-time facial image data of the driver on the seat assembly (200). A position adjustment mechanism is provided on the platform base (100) for adjusting the displacement of the image acquisition device (300) in the X, Y and Z directions, so that the relative distance between the optical center of the image acquisition device (300) and the preset reference point of the seat assembly (200) in the X, Y and Z directions reaches a preset distance; An angle adjustment mechanism (400) is provided on the position adjustment mechanism to adjust the angle of the image acquisition device (300) so that the angle of the image acquisition device (300) reaches a preset angle without changing the coordinate position of the optical center of the image acquisition device (300).

2. The test bench device for a driver monitoring system according to claim 1, characterized in that, The angle adjustment mechanism (400) includes: The support member (410) is disposed on the position adjustment mechanism; Roll adjustment ring (420), around It is rotatably mounted on the support member (410) and locked by the first locking member. It is positioned parallel to the width direction of the image acquisition unit (300); Yaw control ring (430), around The rotatable support ring (420) is rotatably mounted on the roll adjustment ring and locked by the second locking member. It is set parallel to the height direction of the image acquisition device (300); Pitch adjustment ring (440), around The yaw adjustment support ring (430) is rotatably mounted thereon and locked in place by a third locking element. It is arranged parallel to the length direction of the image acquisition device (300); The image acquisition device (300) is disposed on the pitch adjustment support ring (440), and the optical center of the image acquisition device (300) coincides with the rotation center of the roll adjustment support ring (420), the yaw adjustment support ring (430) and the pitch adjustment support ring (440).

3. The test bench device for a driver monitoring system according to claim 2, characterized in that, The first locking element includes a first bolt, and the roll adjusting ring (420) along... A first through hole (421) is provided through the first bolt, which is used for the shank of the first bolt to pass through. The rolling adjustment ring (420) can rotate relative to the shank of the first bolt. The support member (410) is provided with a first threaded hole corresponding to the first through hole (421), and the first threaded hole matches the first bolt. And / or, the second locking element includes a second bolt, the yaw adjustment ring (430) along... A second through hole (431) is provided through the bolt, the second through hole (431) is used for the shank of the second bolt to pass through, and the yaw adjustment support ring (430) can rotate relative to the shank of the second bolt; the roll adjustment support ring (420) is provided with a second threaded hole corresponding to the position of the second through hole (431), and the second threaded hole matches the second bolt; And / or, the third locking element includes a third bolt, the pitch adjustment collar (440) along... A third through hole (441) is provided, which is used for the shank of the third bolt to pass through. The pitch adjustment support ring (440) can rotate relative to the shank of the third bolt. The yaw adjustment support ring (430) is provided with a third threaded hole corresponding to the position of the third through hole (441), and the third threaded hole matches the third bolt.

4. The test bench device for a driver monitoring system according to claim 1, characterized in that, The position adjustment mechanism includes: The first adjusting member (510) is slidably disposed on the platform base (100) along the X direction and locked by the fourth locking member; The second adjusting member (520) is slidably disposed on the first adjusting member (510) along the Z direction and is locked by the fifth locking member; The third adjusting member (530) is slidably disposed on the second adjusting member (520) along the Y direction and locked by the sixth locking member; The angle adjustment mechanism (400) is disposed on the third adjustment member (530).

5. The test bench apparatus for a driver monitoring system according to claim 4, characterized in that, There are two first adjusting members (510), which are spaced apart along the Y direction, and the second adjusting member (520) is disposed between the two first adjusting members (510); And / or, the platform base (100) is provided with a guide rail (540), the guide rail (540) is arranged parallel to the X direction, the first adjusting member (510) is slidably arranged on the guide rail (540) along the X direction, the first adjusting member (510) is provided with a fourth threaded hole, and the fourth locking member includes a fourth bolt that matches the fourth threaded hole.

6. The test bench apparatus for a driver monitoring system according to any one of claims 1 to 5, characterized in that, It also includes a light source (610), which is disposed on the position adjustment mechanism. The position adjustment mechanism is used to adjust the position of the light source (610) along the X direction. The light source (610) is electrically connected to a brightness adjustment component and is used to simulate natural light and / or nighttime lighting.

7. The test bench apparatus for a driver monitoring system according to claim 6, characterized in that, The light source (610) is connected to the position adjustment mechanism via an angle adjustment component (600). The angle adjustment component (600) is used to adjust the yaw angle and pitch angle of the light source (610) so that the angle of the light source (610) reaches a preset angle. And / or, the light-emitting end of the light source (610) is detachably provided with a light-shielding plate, which is used to change the shape of the light emitted by the light source (610).

8. The test bench apparatus for a driver monitoring system according to any one of claims 1 to 5, characterized in that, The platform base (100) is provided with a mounting groove (110) corresponding to the position of the seat assembly (200). The end of the seat assembly (200) facing the platform base (100) is slidably disposed in the mounting groove (110) along the Z direction and locked by a locking component.

9. A testing method applied to the test bench apparatus for a driver monitoring system as described in any one of claims 1 to 8, characterized in that, The testing method includes the following steps: The position adjustment mechanism adjusts the displacement of the image acquisition unit (300) in the X, Y and Z directions so that the relative distance between the optical center of the image acquisition unit (300) and the preset reference point of the seat assembly (200) in the X, Y and Z directions reaches a preset distance. The angle of the image acquisition device (300) is adjusted by the angle adjustment component so that the angle of the image acquisition device (300) reaches the preset angle without changing the coordinate position of the optical center of the image acquisition device (300). The image acquisition device (300) is activated to acquire real-time facial image data of the driver sitting on the seat assembly (200).

10. The test method according to claim 9, characterized in that, The formula for calculating the displacement of the image acquisition unit (300) in the X direction is as follows: In the formula, The preset distance in the X direction; In the initial state, the relative distance of the optical center with respect to the preset reference point in the X direction is denoted as . And / or, the formula for calculating the displacement of the image acquisition unit (300) in the Y direction is: In the formula, The preset distance in the Y direction; In the initial state, the relative distance of the optical center with respect to the preset reference point in the Y direction is given. And / or, the formula for calculating the displacement of the image acquisition unit (300) in the Z direction is: In the formula, The preset distance in the Z direction; Let be the relative distance of the optical center with respect to the preset reference point in the Z direction in the initial state.

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