Face monitoring and recognition device and method based on computer vision image recognition

Abstract

This invention relates to the field of facial recognition device technology, and more particularly to a facial monitoring and recognition device and method based on computer vision image recognition. The device includes a light-shielding assembly mounted on the main body of the recognition device. The light-shielding assembly includes a light-shielding base and a light-shielding platform. The light-shielding base has a built-in drive gear, and a multi-channel photosensitive sensor is installed on the top of the light-shielding base to detect the angle of sunlight. The light-shielding platform can be moved by the drive gear to block direct sunlight. The light-shielding base contains a light-focusing transmission component and a supplementary lighting assembly mounted on the top of the light-shielding base. The supplementary lighting assembly includes a supplementary lighting plate, which blocks strong light according to the angle of sunlight through the sunshade, preventing direct sunlight from hitting the camera. Simultaneously, the grating adjustment mechanism dynamically adjusts the aperture of the light-transmitting hole at the front of the lens as the angle of the sunshade changes, solving the problem of poor image quality caused by extreme lighting in the prior art and providing a clear basic image for subsequent facial recognition.

Description

Technical Field

[0001] This invention relates to the field of facial recognition device technology, specifically to a facial monitoring and recognition device and method based on computer vision image recognition. Background Technology

[0002] Currently, facial recognition technology based on computer vision image recognition has been widely applied in security, access control, and public area management. This technology uses facial recognition cameras to collect image data of target areas, and then leverages computer vision algorithms to detect, extract, and match faces in the images, achieving identity verification and monitoring of abnormal behavior. Existing devices typically include an image acquisition module, a data processing module, and a display and alert module, with the core reliance on the image acquisition quality of the camera to ensure the accuracy of subsequent algorithm processing.

[0003] Existing devices are prone to overexposure, underexposure, or contrast imbalance in facial images under extreme lighting conditions such as strong light and low light, severely affecting the accuracy and stability of subsequent facial recognition. In strong light environments, when sunlight shines directly on the camera lens or at a large angle, the light intensity far exceeds the dynamic range of the image sensor, causing pixel saturation in highlight areas of the image. Key facial features such as eyebrows, eyes, and nose are obscured and lost due to strong light. In low light environments, insufficient ambient light intensity and insufficient light intake reduce the signal-to-noise ratio of the image sensor. Facial images not only show significant underexposure, but also blur facial contours and texture features, directly leading to a significant decrease in the accuracy of feature extraction and matching. Summary of the Invention

[0004] The purpose of this invention is to provide a face monitoring and recognition device and method based on computer vision image recognition, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A face monitoring and recognition device based on computer vision image recognition includes a light-shielding component installed on the main body of the recognition device. The light-shielding component includes a light-shielding base and a light-shielding platform. The light-shielding base has a built-in drive gear. The top of the light-shielding base is provided with a multi-channel photosensitive sensor for detecting the angle of sunlight. The light-shielding platform can be driven to move by the drive gear to block direct strong light. The light-shielding base is provided with a light-focusing transmission component inside. A supplementary lighting assembly is installed on the top of a light-shielding base. The supplementary lighting assembly includes a supplementary lighting plate, a light-concentrating plate, and a photovoltaic panel. The photovoltaic panel absorbs solar energy and powers the supplementary lighting plate. The supplementary lighting plate provides illumination in low-light environments. The light-concentrating plate is located on one side of the supplementary lighting plate and forms an angle to converge the supplementary lighting rays. A camera is mounted on the main body of the recognition device and located below the light-blocking component. A light-transmitting cover is provided at one end of the camera, and a light-controlling component is provided on the outside of the light-transmitting cover. The light-controlling component includes a light-controlling gear and at least two light-blocking blocks. The light-controlling gear rotates to drive the light-blocking blocks to move, dynamically adjusting the inner diameter of the light-transmitting cover to adapt to the light intensity.

[0006] Preferably, the surface of the light-controlling gear is provided with a movable groove matching the number of light-blocking blocks. The light-blocking blocks are fixedly connected with a connecting arm. The connecting arm is located in the movable groove and one end protrudes out, so that when the light-controlling gear rotates, the connecting arm moves along the movable groove, causing the light-blocking blocks to synchronously gather or separate. A light-transmitting hole is provided at the center of the light-controlling gear, and the diameter of the light-transmitting hole is adapted to the aperture of the light-transmitting cover.

[0007] Preferably, the light-shielding platform is provided with a first sliding bar and a second sliding bar that pass through it, the light-shielding seat is provided with a limiting groove on the side that contacts the light-shielding platform, and a second rack is provided on one side of the light-shielding platform. The second rack meshes with a drive gear, so that the drive gear rotates to move the light-shielding platform, and the movement path of the light-shielding platform is limited by the sliding of the first sliding bar and the second sliding bar along the limiting groove.

[0008] Preferably, the first sliding bar has a built-in reversing gear, the second sliding bar has a built-in first rack, and the limiting groove is provided with a rack that meshes with the reversing gear. Both the reversing gear and the first rack mesh with the light-controlling gear, so that when the light-shielding platform moves, it drives the light-controlling gear to rotate and change the inner diameter of the light-transmitting cover.

[0009] Preferably, the focusing transmission component includes an adjusting gear, a transmission rack, and a transmission gear. A transmission rack meshes with each side of the adjusting gear, and a transmission gear meshes with one side of the transmission rack. The top of the transmission gear is connected to the focusing plate, so that when the adjusting gear rotates, it drives the two transmission gears to rotate in opposite directions through the transmission rack, thereby controlling the included angle of the focusing plate.

[0010] Preferably, a first adjusting toothed bar is provided at the bottom of one of the transmission racks, the first adjusting toothed bar meshes with the adjusting gear, and a second adjusting toothed bar is fixedly connected to one side of the first adjusting toothed bar. An adjusting gear that rotates synchronously with the light control component is provided on one side of the component, and the adjusting gear meshes with the bottom of the second adjusting toothed bar, so that the adjusting gear drives the light control gear to rotate while the adjusting gear rotates.

[0011] Preferably, an anti-detachment cap is fixedly installed at one end of the linkage arm, and the diameter of the anti-detachment cap is larger than the inner wall width of the movable groove to prevent the linkage arm from detaching from the movable groove when it moves.

[0012] Preferably, the multiple light-blocking blocks are connected by connecting strips, and the ring structure is maintained at all times during movement to ensure uniform change in the inner diameter of the light-transmitting cover.

[0013] A face recognition method for surveillance based on computer vision image recognition includes the following steps: Step 1: Start the camera. The photovoltaic panel will start simultaneously and absorb solar energy to charge the built-in battery of the supplementary lighting panel. At the same time, the multi-channel photosensitive sensor will be activated, and the face monitoring and recognition device will enter standby monitoring mode.

[0014] Step 2: The multi-channel photosensitive sensor collects light intensity and angle signals from different directions through multiple photosensitive channels and transmits them to the control unit of the main body of the device. The control unit then determines whether the current environment is a strong daytime light environment or a low nighttime light environment.

[0015] Step 3: In strong daylight conditions, the control unit drives the drive gear to rotate, causing the shading platform to move in the direction of sunlight to block the strong light. At the same time, the linkage light control component adjusts the inner diameter of the light-transmitting cover: the inner diameter expands when the angle of sunlight increases and contracts when the angle decreases.

[0016] Step 4: In low-light conditions at night, turn on the LED tubes in the fill light panel. The spotlight reflects and focuses the light to the focal area in front of the camera. The laser range sensor measures the distance between the face and the camera and feeds it back to the control unit. The control unit activates the light-focusing transmission component and adjusts the angle of the spotlight panel so that the light convergence point is always located on the face.

[0017] Preferably, in step S4, while the focusing transmission component adjusts the angle of the focusing plate, the linkage light control component simultaneously adjusts the inner diameter of the light-transmitting cover. The closer the face is to the camera, the smaller the inner diameter of the light-transmitting cover, and the less light is transmitted by the camera. The farther the face is from the camera, the larger the aperture of the light-transmitting cover, and the more light is transmitted by the camera.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses a sunshade to block strong sunlight according to the angle of sunlight, preventing direct sunlight from hitting the camera. Simultaneously, the grating adjustment mechanism dynamically adjusts the aperture of the light-gathering hole at the front of the lens as the angle of the sunshade changes. When the sunlight is close to the front, the aperture is adjusted to its minimum to reduce the amount of light entering and prevent overexposure; as the sunlight moves and the light intensity weakens, the aperture is adjusted to increase the amount of light entering and prevent underexposure. This solves the problem of poor image quality caused by extreme lighting in existing technologies, providing a clear base image for subsequent face recognition. 2. In addition, the supplementary lights are powered by daytime electricity storage through the photovoltaic panels on the sunshade, while the laser rangefinder identifies the distance to the face. A concentrator is set at the supplementary light. When the face is close to the recognition device, the concentrator focuses the light on the face. When the face is far from the recognition device, the concentrator diffuses the light so that the light always converges on the face. This solves the problem of insufficient light in low-light environments when using the recognition device in low-light scenes. 3. Based on the above structure, when the face is close to the recognition device, the light-concentrating plate shrinks while the light-transmitting aperture shrinks to reduce excessive light entering the photosensitive element, avoid the loss of details in the bright areas of the face, and improve the depth of field. When the face is far from the recognition device, the light-concentrating plate diffuses while the light-transmitting aperture is enlarged to widen the light channel, capture more dispersed directional supplementary light, and offset the underexposure caused by light attenuation. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of the face monitoring and recognition device and method based on computer vision image recognition of the present invention; Figure 2 for Figure 1 Enlarged view of area A in the image; Figure 3 This is an exploded view of the overall structure of the light-shielding component in the face monitoring and recognition device and method based on computer vision image recognition of the present invention. Figure 4 This is a schematic diagram of the mating surface between the light-shielding platform and the light-shielding seat in the face monitoring and recognition device and method based on computer vision image recognition of the present invention. Figure 5 This is a schematic diagram of the overall structure of the focusing transmission component in the face monitoring and recognition device and method based on computer vision image recognition of the present invention. Figure 6 This is a schematic diagram showing the disassembly of the head structure of the camera in the face monitoring and recognition device and method based on computer vision image recognition of the present invention; Figure 7 This is a schematic diagram of the overall structure of the light control component in the face monitoring and recognition device and method based on computer vision image recognition of the present invention; Figure 8 The diagram shows the motion trajectory of the central control light component in the face monitoring and recognition device and method based on computer vision image recognition of the present invention, with the connecting strip shown. Figure 9 This is a schematic diagram showing the change in the inner diameter of the light-transmitting cover in the face monitoring and recognition device and method based on computer vision image recognition of the present invention.

[0020] In the diagram: 100, light-shielding assembly; 110, light-shielding base; 111, drive gear; 112, limiting groove; 113, multi-channel photosensitive sensor; 120, light-shielding platform; 121, first sliding bar; 122, second sliding bar; 123, reversing gear; 124, first rack; 125, second rack; 130, focusing transmission component; 131, adjusting gear; 132, transmission rack; 133, transmission gear; 134, first adjusting rack; 13 5. Second adjusting gear; 140. Supplemental lighting assembly; 141. Supplemental lighting plate; 142. Concentrating plate; 143. Photovoltaic panel; 200. Camera; 210. Light-transmitting cover; 220. Light control assembly; 221. Light control gear; 222. Movable slot; 223. Light blocking block; 224. Linkage arm; 225. Anti-detachment cap; 226. Light-transmitting hole; 227. Connecting strip; 230. Adjusting gear; 300. Identification device body; 310. Laser rangefinder sensor. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0022] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.

[0023] like Figure 1 and Figure 2 The embodiment shown discloses a face monitoring and recognition device based on computer vision image recognition, including a light-shielding component 100, a camera 200, and a recognition device body 300. The light-shielding component 100 is installed at the top front of the recognition device body 300, and the camera 200 is installed on the front of the recognition device body 300 and located below the light-shielding component 100. Laser range sensors 310 are provided on both sides of the camera 200 on the front of the recognition device body 300. The laser range sensors 310 are used to detect the distance between the face and the camera 200. Furthermore, in outdoor environments with strong light or low light, the existing device is prone to overexposure, underexposure, or contrast imbalance in facial images, which seriously affects the accuracy and stability of subsequent facial recognition. Key features of the face, such as eyebrows, eyes, and nose, cannot be accurately acquired, thus affecting the device's recognition accuracy. And this device, during the facial recognition process, such as Figure 3As shown, the shading assembly 100 includes a shading base 110 and a shading platform 120. The shading base 110 has a drive gear 111 controlled by a power source (such as a motor). A multi-channel photosensitive sensor 113 for detecting the angle of sunlight is located on the top of the shading base 110. The multi-channel photosensitive sensor 113 collects light intensity and angle signals from different directions through multiple photosensitive channels to detect the angle of sunlight. The control unit (PLC or other conventional electronic control modules in the art) activates the power source to control the rotation direction of the drive gear 111 according to the angle of sunlight. Figure 4 As shown, the light-shielding platform 120 is provided with a first sliding bar 121 and a second sliding bar 122 that pass through it. The upper and lower sides of the inner cavity of the light-shielding seat 110 are provided with limiting grooves 112. A second rack 125 is provided on one side of the light-shielding platform 120, and the second rack 125 meshes with the drive gear 111. When the drive gear 111 rotates, it drives the light-shielding platform 120 to move. The first sliding bar 121 and the second sliding bar 122 are adapted to the limiting groove 112 and move along the limiting groove 112 when the light-shielding platform 120 moves, so that the light-shielding platform 120 moves along a predetermined track. Thus, according to the angle of sunlight, the light-shielding platform 120 can be controlled to move in the direction of sunlight and block the sunlight to prevent the sunlight from shining directly on the camera 200.

[0024] Continue as Figures 6-7 As shown, a light-transmitting cover 210 is provided at one end of the camera 200. A light-controlling component 220 is provided on the outer side of the light-transmitting cover 210. The light-controlling component 220 includes a light-controlling gear 221 and five light-blocking blocks 223. Five movable slots 222 are formed on the surface of the light-controlling gear 221. A connecting arm 224 is connected to one side of each light-blocking block 223. One end of each connecting arm 224 passes through a movable slot 222. The five light-blocking blocks 223 are connected by connecting strips 227. Figure 4 As shown, a reversing gear 123 is provided in the inner cavity of the first sliding bar 121, and a rack that meshes with the reversing gear 123 is provided in the limiting groove 112 opened at the top of the inner cavity of the light-shielding seat 110. A first rack 124 is provided at the bottom of the inner cavity of the second sliding bar 122. Both the reversing gear 123 and the first rack 124 mesh with the light-controlling gear 221. When the light-shielding platform 120 moves with the angle of sunlight, the reversing gear 123 rotates under the action of the rack. At the same time, since the first rack 124 meshes with the light-controlling gear 221, when the light-shielding platform 120 moves to the left of the light-shielding seat 110, the reversing gear 123 drives the light-controlling gear 221 to rotate. When the light-shielding platform 120 moves to the right of the light-shielding seat 110, the first rack 124 drives the light-controlling gear 221 to rotate. Figure 8As shown, when the light-controlling gear 221 rotates and its rotation direction is controlled, the connecting arm 224 moves along the inner wall of the movable groove 222, simultaneously driving the five light-blocking blocks 223 to move outwards. Since the light-blocking blocks 223 are connected by the connecting strip 227, the diameter of the ring formed by the light-blocking blocks 223 and the connecting strip 227 increases. Based on the above principle, by changing the rotation direction of the light-controlling gear 221, the diameter of the ring formed by the light-blocking blocks 223 and the connecting strip 227 can be reduced, such as... Figure 9 As shown, since the light-blocking block 223 is disposed in the inner cavity of the light-transmitting cover 210, the inner diameter of the light-transmitting cover 210 can be changed by rotating the light-controlling gear 221, such as... Figure 3 As shown, due to the gradually increasing angle of sunlight and the gradually decreasing intensity of sunlight, when the light-shielding platform 120 moves to the left of the light-shielding base 110, the inner diameter of the light-transmitting cover 210 gradually increases through the engagement of the reversing gear 123 and the light-controlling gear 221, ensuring sufficient light throughput for the camera 200. When the light-shielding platform 120 moves to the right of the light-shielding assembly 100, the corresponding angle of sunlight increases, and the ambient light intensity relatively decreases. The first rack 124 engages with the light-controlling gear 221, keeping the rotation direction of the light-controlling gear 221 unchanged, and the inner diameter of the light-transmitting cover 210 still increases, ensuring sufficient light throughput for the camera 200. In summary, when the light-shielding platform 120 moves to the sides, it indicates... When the sunlight angle is large, especially in the evening or early morning, the inner diameter of the light-transmitting cover 210 is increased to ensure sufficient light transmission for the camera 200. When the light-shielding platform 120 is closer to the center of the light-shielding base 110, it indicates a smaller sunlight angle and the time is close to noon. At this time, the sunlight angle is large and the ambient reflected light is strong. By reducing the aperture of the light-transmitting cover 210, the light transmission of the camera 200 is reduced to avoid overexposure of the face image captured by the camera. Through the combined action of the light-shielding component 100 and the camera 200, the face recognition device can avoid direct sunlight on the camera 200 at any time of day while adjusting the light transmission of the camera 200 accordingly to avoid overexposure and underexposure.

[0025] like Figure 3 As shown, the supplementary lighting assembly 140 includes a supplementary lighting plate 141, a concentrator plate 142, and a photovoltaic panel 143. The photovoltaic panel 143 is positioned at the top and provides power to the supplementary lighting plate 141. The supplementary lighting plate 141 has a built-in battery and LED tubes for storing the electrical energy conducted by the photovoltaic panel 143 and providing light at night through the LED tubes. Two concentrator plates 142 are arranged on one side of the supplementary lighting plate 141. Figure 5As shown, the focusing transmission component 130 includes an adjusting gear 131, a transmission rack 132, and a transmission gear 133. At night, the laser rangefinder 310 senses the position of the face at the distance to the camera 200, and a power source (motor) starts the adjusting gear 131 to rotate. A transmission rack 132 meshes with each side of the adjusting gear 131. By controlling the rotation direction of the adjusting gear 131, the two transmission racks 132 can move in opposite directions or towards each other. One side of each transmission rack 132 is aligned with the outer edge of the transmission gear 133. The transmission gear 133 is meshed with a light-concentrating plate 142 connected to its top. This allows the adjusting gear 131 to rotate and adjust the opening and closing angle of the two light-concentrating plates 142 according to the position of the face at the camera 200. When the light-concentrating plate 141 emits light, the diffused light is reflected and concentrated by the two light-concentrating plates 142. The angle of the light-concentrating plates 142 changes the convergence point of the light, so that the light always converges on the face. This solves the problem of insufficient light in low-light environments such as night when the recognition device is used in low-light scenes.

[0026] During use, it was also found that when the face is close to the camera 200, the light converges forward, and the light-concentrating plate 142 is drawn in, resulting in the light being concentrated on the face (high light intensity density), which leads to the loss of details in the bright areas of the face (overexposure). When the face is far from the camera 200, the light-concentrating plate 142 diffuses the light and converges it in a directional manner (but there is still a slight dispersion), and the distance causes the light intensity to naturally decrease, resulting in a certain degree of underexposure when the recognition device captures facial features. Continue as Figure 5As shown, a diameter adjustment gear 230 is provided on one side of the light control gear 221. The diameter adjustment gear 230 can rotate synchronously with the light control gear 221. A first diameter adjustment rack 134 is provided at the bottom of a transmission rack 132. The first diameter adjustment rack 134 meshes with the pitch adjustment gear 131. A second diameter adjustment rack 135 is fixedly connected to one side of the first diameter adjustment rack 134. The bottom of the second diameter adjustment rack 135 meshes with the diameter adjustment gear 230, so that when the pitch adjustment gear 131 rotates, it drives the first diameter adjustment rack 134 to move. The movement of the first diameter adjustment rack 134 drives the second diameter adjustment rack 135 to move. The movement of the second diameter adjustment rack 135 drives the diameter adjustment gear 230 to rotate, and the light control gear 221 rotates synchronously. At night, when the pitch adjustment gear 131 rotates to adjust the light convergence point, since the light convergence point adjustment is based on the distance between the face and the camera 200, and the rotation of the light control gear 221 can control the light convergence point, the light convergence point adjustment is based on the distance between the face and the camera 200. The inner diameter of the light cover 210 is adjusted to control the light throughput of the camera 200. When the face is close to the camera 200, the adjustment gear 131 rotates to control the light-concentrating plate 142 to move the light convergence point forward. At this time, the adjustment gear 131 simultaneously drives the light-controlling gear 221 to rotate, making the inner diameter of the light cover 210 smaller. This reduces excessive light entering the photosensitive element of the camera 200, preventing the loss of details in the bright areas of the face (overexposure) and improving the depth of field (making the edges of the face clearer). When the face is far from the camera 200, the adjustment gear 131 rotates to control the light-concentrating plate 142 to move the light convergence point backward. At this time, the adjustment gear 131 controls the light-controlling gear 221 to rotate, making the inner diameter of the light cover 210 larger. This widens the light channel of the camera 200, capturing more dispersed directional supplementary light and offsetting the underexposure caused by light attenuation due to distance. This allows the recognition device to accurately capture facial feature information even in low-light environments at night.

[0027] like Figure 7 As shown, one end of the linkage arm 224 passes through the movable groove 222 and is fixedly installed with an anti-detachment cap 225. The diameter of the anti-detachment cap 225 is larger than the inner cavity width of the movable groove 222, so that when the linkage arm 224 moves in the inner wall of the movable groove 222, it effectively prevents the linkage arm 224 from detaching from the movable groove 222, thus ensuring the stability of the inner diameter adjustment of the light transmission cover 210.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. The present invention is not limited to the above embodiments; the embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this invention is defined by the appended claims and their equivalents.

Claims

1. A face monitoring and recognition device based on computer vision image recognition, characterized in that: include A light-shielding assembly (100) is installed on the main body (300) of the identification device. The light-shielding assembly (100) includes a light-shielding base (110) and a light-shielding platform (120). The light-shielding base (110) has a built-in drive gear (111). A multi-channel photosensitive sensor (113) is provided on the top of the light-shielding base (110) for detecting the angle of sunlight. The light-shielding platform (120) can be driven to move by the drive gear (111) to block direct strong light. A light-concentrating transmission component (130) is provided inside the light-shielding base (110). A supplementary lighting assembly (140) is installed on top of a light-shielding base (110). The supplementary lighting assembly (140) includes a supplementary lighting plate (141), a light-concentrating plate (142), and a photovoltaic panel (143). The photovoltaic panel (143) absorbs solar energy and supplies power to the supplementary lighting plate (141). The supplementary lighting plate (141) provides illumination in low-light environments. The light-concentrating plate (142) is disposed on one side of the supplementary lighting plate (141) and forms an angle to converge the supplementary lighting rays. A camera (200) is mounted on the main body (300) of the recognition device and located below the light shielding component (100). A light-transmitting cover (210) is provided at one end of the camera (200). A light control component (220) is provided on the outside of the light-transmitting cover (210). The light control component (220) includes a light control gear (221) and at least two light blocking blocks (223). The light blocking blocks (223) are moved by rotating the light control gear (221), and the inner diameter of the light-transmitting cover (210) is dynamically adjusted to adapt to the light intensity.

2. The face monitoring and recognition device based on computer vision image recognition according to claim 1, characterized in that: The light-controlling gear (221) has a movable groove (222) on its surface that matches the number of light-blocking blocks (223). The light-blocking blocks (223) are fixedly connected to a connecting arm (224). The connecting arm (224) is located in the movable groove (222) and extends out at one end. When the light-controlling gear (221) rotates, the connecting arm (224) moves along the movable groove (222), causing the light-blocking blocks (223) to converge or separate synchronously. A light-transmitting hole (226) is provided at the center of the light-controlling gear (221). The light-transmitting hole (226) is adapted to the aperture of the light-transmitting cover (210).

3. The face monitoring and recognition device based on computer vision image recognition according to claim 2, characterized in that: The light-shielding platform (120) is provided with a first sliding bar (121) and a second sliding bar (122) that pass through it. The light-shielding seat (110) is provided with a limiting groove (112) on the side that contacts the light-shielding platform (120). A second rack (125) is provided on one side of the light-shielding platform (120). The second rack (125) meshes with the drive gear (111), so that the drive gear (111) rotates to move the light-shielding platform (120). The movement path of the light-shielding platform (120) is limited by the sliding of the first sliding bar (121) and the second sliding bar (122) along the limiting groove (112).

4. A face monitoring and recognition device based on computer vision image recognition according to claim 3, characterized in that: The first sliding bar (121) has a built-in reversing gear (123), and the second sliding bar (122) has a built-in first rack (124). The limiting groove (112) is provided with a rack that meshes with the reversing gear (123). The reversing gear (123) and the first rack (124) both mesh with the light control gear (221), so that when the light shielding platform (120) moves, it drives the light control gear (221) to rotate and change the inner diameter of the light transmission cover (210).

5. The face monitoring and recognition device based on computer vision image recognition according to claim 4, characterized in that: The focusing transmission component (130) includes an adjusting gear (131), a transmission rack (132), and a transmission gear (133). The adjusting gear (131) is meshed with a transmission rack (132) on each side, and a transmission gear (133) is meshed with one side of the transmission rack (132). The top of the transmission gear (133) is connected to the focusing plate (142), so that when the adjusting gear (131) rotates, it drives the two transmission gears (133) to rotate in opposite directions through the transmission rack (132), thereby controlling the included angle of the focusing plate (142).

6. The face monitoring and recognition device based on computer vision image recognition according to claim 5, characterized in that: A first adjusting rack (134) is provided at the bottom of one of the transmission racks (132). The first adjusting rack (134) meshes with the adjusting gear (131), and a second adjusting rack (135) is fixedly connected to one side of it. An adjusting gear (230) that rotates synchronously with the light control component (220) is provided on one side. The adjusting gear (230) meshes with the bottom of the second adjusting rack (135), so that the adjusting gear (131) rotates while the adjusting gear (131) rotates, causing the adjusting gear (230) to drive the light control gear (221) to rotate.

7. The face monitoring and recognition device based on computer vision image recognition according to claim 6, characterized in that: One end of the linkage arm (224) is fixedly equipped with an anti-detachment cap (225). The diameter of the anti-detachment cap (225) is greater than the inner wall width of the movable groove (222) to prevent the linkage arm (224) from detaching from the movable groove (222) when it moves.

8. The face monitoring and recognition device based on computer vision image recognition according to claim 7, characterized in that: Multiple light-blocking blocks (223) are connected by connecting strips (227) and always maintain a ring structure when moving to ensure that the inner diameter of the light-transmitting cover (210) changes uniformly.

9. A face recognition method for surveillance based on computer vision image recognition, characterized in that: The face monitoring and recognition device based on computer vision image recognition as described in claim 8 includes the following steps: S1. Start the camera (200), the photovoltaic panel (143) starts up and absorbs solar energy to charge the built-in battery of the supplementary light panel (141), and at the same time activate the multi-channel photosensitive sensor (113), and the face monitoring and recognition device enters the standby monitoring state. S2, The multi-channel photosensitive sensor (113) collects light intensity and angle signals from different directions through multiple photosensitive channels and transmits them to the control unit of the main body of the device. The control unit determines whether the current environment is a strong daytime light environment or a low nighttime light environment. S3. Under strong daylight conditions, the control unit drives the drive gear (111) to rotate, causing the shading platform (120) to move towards the direction of sunlight to block strong light. At the same time, the linkage light control component (220) adjusts the inner diameter of the light-transmitting cover (210): the inner diameter expands when the angle of sunlight increases and shrinks when the angle decreases. S4. In low-light conditions at night, turn on the LED tube in the fill light plate (141), and the light-concentrating plate (142) reflects and converges the light to the focal area in front of the camera (200). The laser range sensor (310) measures the distance between the face and the camera (200) and feeds it back to the control unit. The control unit starts the light-concentrating transmission component (130) and adjusts the angle of the light-concentrating plate (142) so that the light convergence point is always located on the face.

10. A face monitoring and recognition method based on computer vision image recognition according to claim 9, characterized in that: In step S4, while the focusing transmission component (130) adjusts the angle of the focusing plate (142), the linkage light control component (220) simultaneously adjusts the inner diameter of the light-transmitting cover (210). The closer the face is to the camera (200) (the closer the light convergence point), the smaller the inner diameter of the light-transmitting cover (210) becomes, and the less light is transmitted to the camera (200). The farther the face is from the camera (200), the larger the aperture of the light-transmitting cover (210) becomes, and the more light is transmitted to the camera (200).

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