In-cabin monitoring camera
By using the dual-light source double exposure algorithm in the on-board lens, the problem of poor imaging quality in scenes of severe light changes and glasses reflection is solved, efficient image processing is achieved, hardware costs are reduced, and it is suitable for large-scale applications.
Patent Information
- Application Number
- CN202421731093.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-22
- Publication Date
- 2025-05-30
- Estimated Expiration
- 2034-07-22
AI Technical Summary
In complex scenes where light changes are large and glasses reflect severely, the imaging quality is poor, and the hardware cost of special lenses or coatings is high, which is not conducive to large-scale applications.
The dual-light exposure algorithm is adopted to achieve image synthesis processing through dual-light exposure of the left LED and right LED through dual-light exposure of the lens group, eliminating glasses' reflection and improving imaging quality.
No special lenses or coatings are required, which reduces hardware costs, is suitable for large-scale applications, effectively deals with light changes and glasses' reflection, improves the stability and reliability of the algorithm, and ensures the accuracy of image analysis and application.
Smart Images
Figure CN222928440U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of vehicle accessories, in particular to an in-cabin monitoring camera. Background Art
[0002] In order to reduce the influence of lens reflection on imaging quality, modern vehicle-mounted lenses generally adopt coating technology. By depositing an extremely thin transparent film layer on the lens surface, coating technology can increase the light penetration, reduce glare and ghost images, improve color balance and enhance imaging sharpness. The quality of coating technology directly affects the imaging quality of vehicle-mounted lenses.
[0003] In the prior art, the camera design uses special lenses or coatings to reduce the influence of glasses reflection. The special lenses or coatings have high hardware costs and are not conducive to large-scale application. In complex scenarios with large light changes and serious glasses reflection, the protective effect of special lenses and coatings is relatively weak, resulting in poor imaging quality. Summary of the Utility Model
[0004] The purpose of the utility model is to solve any of the above technical problems, and thus propose an in-cabin monitoring camera.
[0005] To achieve the above purpose, the utility model adopts the following technical scheme: An in-cabin monitoring camera includes an upper housing for fixing and a filter fixed thereon. A lower housing is fixedly sleeved on the upper housing. An upper PCB board is arranged inside the upper housing. A lower PCB board is connected below the upper PCB board. A lens group is arranged in the middle of the upper PCB board. A left LED and a right LED are symmetrically arranged on both sides of the lens group. A left LED driver and a right LED driver are arranged on the lower PCB board.
[0006] Further, a pin header is arranged on one side below the lens group in the middle of the upper PCB board, and a coaxial connector is arranged on the other side. The coaxial connector protrudes and is exposed to be connected and communicated with external lines. The parameters of the left LED and the right LED symmetrically arranged on both sides of the lens group on the upper PCB board are the same. The wavelength of the left LED and the right LED is 940 nm, the power consumption is 500 mW, and the light-emitting bias angle is 30°. A photosensitive chip is arranged at the bottom of the lens group on the upper PCB board. The pin header on the upper PCB board is connected and communicated with the lower PCB board.
[0007] Further, a female header is arranged on the upper surface of the lower PCB board. The female header is inserted and connected with the pin header. The left LED driver and the right LED driver are arranged on both sides above the lower surface of the lower PCB board. An image processor is arranged below the lower surface of the lower PCB board. A heat-conducting silica gel is fixedly arranged between the lower surface of the lower PCB board and the inner wall of the lower housing.
[0008] Further, the left LED driver and the right LED driver on the lower PCB board are respectively connected to the left LED and the right LED on the upper PCB board to control dimming. The positions of the left LED, the right LED, and the lens group are on the same horizontal line. The exposure time of the camera is 10 milliseconds, and the exposure frequency is 30 Hz. The left LED driver and the right LED driver are set to have a light source power consumption of 500 mW and a light emission frequency of 300 Hz. The image processor sets the pulse width modulation dimming duty cycle of the left LED driver and the right LED driver to 50%.
[0009] The beneficial effects of the present utility model are as follows:
[0010] Through the integration of the dual-light-source double-exposure algorithm, no special lenses or coatings are required, avoiding high hardware costs and facilitating large-scale applications. Through the dual-light-source double-exposure of the present invention, complex scenarios with large light changes and severe glare on glasses can be effectively dealt with, improving the stability and reliability of the algorithm. Through the algorithm to synthesize pictures, the glare on glasses can be effectively eliminated, avoiding distortion of the original image, and ensuring the accuracy of subsequent image analysis and applications. By solving the problem of glare on glasses, the shooting quality of the vehicle-mounted infrared camera is improved, thereby improving the accuracy of image processing and analysis and enhancing the user experience. Description of the Drawings
[0011] Figure 1 It is a schematic structural diagram of the whole of the present utility model;
[0012] Figure 2 It is a schematic optical path diagram of the whole of the present utility model;
[0013] Figure 3 It is a schematic installation diagram of the lens group of the present utility model;
[0014] Figure 4 It is a simulated light intensity diagram of the whole of the present utility model;
[0015] Figure 5 It is a derivation diagram of the imaging principle of the whole of the present utility model.
[0016] In Figures 1 to 5 , the corresponding relationship between the component names or lines and the drawing reference numerals is: filter 1, upper housing 2, lens group 3, upper PCB board 4, left LED 5, right LED 6, pin header 7, female header 8, lower PCB board 9, photosensitive chip 10, coaxial connector 11, left LED driver 12, right LED driver 13, image processor 14, thermal conductive silicone 15, lower housing 16. Detailed Embodiments
[0017] Please refer to Figures 1 to 5 ;
[0018] This embodiment provides an in-cabin monitoring camera, which includes an upper housing 2 for fixing and a filter 1 fixedly arranged thereon. A lower housing 16 is fixedly sleeved on the upper housing 2. An upper PCB board 4 is arranged inside the upper housing 2. A lower PCB board 9 is connected below the upper PCB board 4. A lens group 3 is arranged in the middle of the upper PCB board 4. A left LED 5 and a right LED 6 are symmetrically arranged on both sides of the lens group 3. A left LED driver 12 and a right LED driver 13 are arranged on the lower PCB board 9.
[0019] In a specific embodiment, the positions of the left LED 5, the right LED 6 and the lens group 3 are on the same horizontal line. The left LED 5 and the right LED 6 are symmetrically arranged on both sides of the lens group 3. Due to the light source optical axis offset and exposure offset, the pictures obtained by the camera show one side bright and the other side dark. After the left LED 5 is turned on, a picture is captured and saved to the backend system for picture synthesis. After turning off the left LED 5 and turning on the right LED 6, a picture is captured and saved to the backend system to be synthesized with the picture of the left LED 5 to obtain a picture with complete exposure.
[0020] Preferably, a pin header 7 is arranged on one side below the lens group 3 arranged in the middle of the upper PCB board 4, and a coaxial connector 11 is arranged on the other side. The coaxial connector 11 protrudes and is exposed to be connected and communicated with the external circuit. The parameters of the left LED 5 and the right LED 6 symmetrically arranged on both sides of the lens group 3 of the upper PCB board 4 are the same. The wavelength of the left LED 5 and the right LED 6 is 940 nm, the power consumption is 500 mW, and the light emitting bias angle is 30°. A photosensitive chip 10 is arranged at the bottom of the lens group 3 of the upper PCB board 4. The pin header 7 of the upper PCB board 4 is connected and communicated with the lower PCB board 9.
[0021] In a specific embodiment, the left LED 5 is turned on for the first exposure, and the exposure time is 10 milliseconds. While the left LED 5 is exposing, the lens group 3 starts to collect images and stores the collected images in the image processor 14. The left LED 5 is turned off, and the right LED 6 is turned on for the second exposure, and the exposure time is 10 milliseconds. While the right LED 6 is exposing, the lens group 3 starts to collect images again and stores the collected images in the image processor 14. The image processing software in the image processor 14 synthesizes the two images collected by the left LED 5 and the right LED 6. When synthesizing, the weights of the two images can be adjusted according to the actual situation. For example, the weight of the left LED 5 image is 0.5, and the weight of the right LED 6 image is 0.5 to achieve the best synthesis effect.
[0022] Preferably, a female header 8 is arranged on the upper surface of the lower PCB board 9. The female header 8 is inserted and connected with the pin header 7. The left LED driver 12 and the right LED driver 13 are arranged on both sides above the lower surface of the lower PCB board 9. An image processor 14 is arranged below the lower surface of the lower PCB board 9. The thermal conductive silicone 15 is fixedly arranged between the lower surface of the lower PCB board 9 and the inner wall of the lower housing 16.
[0023] Preferably, the left LED driver 12 and the right LED driver 13 of the lower PCB board 9 are respectively connected to the left LED 5 and the right LED 6 of the upper PCB board 4 to control dimming. The positions of the left LED 5, the right LED 6 and the lens group 3 are on the same horizontal line. The exposure time of the camera is 10 milliseconds, the exposure frequency is 30 Hz, the left LED driver 12 and the right LED driver 13 are set with a light source power consumption of 500 mW, the light emission frequency is 300 Hz, and the image processor 14 sets the pulse width modulation dimming duty cycle of the left LED driver 12 and the right LED driver 13 to 50%.
[0024] In a specific embodiment, the exposure time and exposure frequency of the lens group 3, the left LED driver 12 and the right LED driver 13 are set with the light source power consumption and light emission frequency, and the image processor 14 sets the pulse width modulation dimming duty cycle. These parameters can be adjusted according to the actual environment and the acquisition requirements of the photosensitive chip 10.
[0025] In a specific embodiment, as Figure 5 shown, the image after secondary exposure, secondary acquisition and synthesis is simulated. The lens group 3 is 50 mm away from the person's glasses. The theoretical diameter of the reflection point within the maximum light intensity range when a single LED emits light once is 3 - 5 mm. The reflected light part of the glasses will be effectively reduced or even eliminated by software. The exposure effect of the synthesized image is balanced, thus improving the quality of the image. At the same time, in order to avoid causing unnecessary distortion to the original image and affecting subsequent image analysis and applications, an optimized algorithm can be adopted, such as a reflection processing algorithm based on deep learning. In this way, the problem of glasses reflection can be effectively solved without increasing the hardware cost, and the shooting quality of the vehicle-mounted infrared camera can be improved.
[0026] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its inventive concept, makes equivalent substitutions or changes, and all should be covered within the protection scope of the present invention.
Claims
1. An in-cabin surveillance camera, comprising an upper housing (2) for fixing and a filter (1) fixedly arranged thereon, wherein a lower housing (16) is fixedly sleeved on the upper housing (2), an upper PCB board (4) is arranged inside the upper housing (2), and a lower PCB board (9) is connected below the upper PCB board (4), characterized in that: A lens group (3) is arranged in the middle of the upper PCB board (4), a left LED (5) and a right LED (6) are symmetrically arranged on both sides of the lens group (3), and a left LED driver (12) and a right LED driver (13) are arranged on the lower PCB board (9).
2. The in-cabin surveillance camera according to claim 1, characterized in that: A pin header (7) is arranged on one side below the lens group (3) arranged in the middle of the upper PCB board (4), and a coaxial connector (11) is arranged on the other side. The coaxial connector (11) protrudes and is exposed from the upper shell (2) to be connected to an external circuit. The left LED (5) and the right LED (6) symmetrically arranged on both sides of the lens group (3) of the upper PCB board (4) have the same parameters. The wavelength of the left LED (5) and the right LED (6) is 940nm, the power consumption is 500mW, and the light emission bias angle is 30°. A photosensitive chip (10) is arranged at the bottom of the lens group (3) of the upper PCB board (4), and the pin header (7) of the upper PCB board (4) is connected to the lower PCB board (9).
3. The in-cabin surveillance camera according to claim 2, characterized in that: A female header (8) is arranged on the upper surface of the lower PCB board (9), the female header (8) is plugged into and connected with the pin header (7), a left LED driver (12) and a right LED driver (13) are arranged on both sides above the lower surface of the lower PCB board (9), an image processor (14) is arranged below the lower surface of the lower PCB board (9), and a thermal conductive silica gel (15) is fixedly arranged between the lower surface of the lower PCB board (9) and the inner wall of the lower shell (16).
4. The in-cabin surveillance camera according to claim 3, characterized in that: The left LED driver (12) and the right LED driver (13) of the lower PCB board (9) are respectively connected to the left LED (5) and the right LED (6) of the upper PCB board (4) to control dimming. The positions of the left LED (5), the right LED (6) and the lens group (3) are on the same horizontal line. The exposure time of the camera is 10 milliseconds and the exposure frequency is 30 Hz. The left LED driver (12) and the right LED driver (13) are set to have a light source power consumption of 500 mW and a light emission frequency of 300 Hz. The image processor (14) is set to have a pulse width modulation dimming duty cycle of 50% for the left LED driver (12) and the right LED driver (13).