Self-closing ring car lamp surface electro-controlled color-changing film light intensity adjusting system and control method

Abstract

The application discloses a self-closing car lamp surface electric control variable color film light intensity adjusting system and a control method, and belongs to the technical field of automobile lighting. The self-closing car lamp surface electric control variable color film light intensity adjusting system comprises a lampshade, a camera module, an EC film, an EC drive circuit and an image processing module; the camera module is used for collecting vehicle external environment and road images; the image processing module is used for calculating the current incident light intensity of the camera module according to the vehicle external environment and road images collected by the camera module, and dynamically adjusting the output voltage of the EC drive circuit according to the current incident light intensity of the camera module; and the EC film is used for adjusting the light transmittance under the action of the output voltage of the EC drive circuit. The application provides a self-closing car lamp surface electric control variable color film light intensity adjusting system and a control method, realizes weakening of the incident light intensity of the camera module, has high spatial integration and an ultra-wide light transmittance adjusting range, and improves the response speed to transient light intensity.

Description

Technical Field

[0001] The present invention relates to a light intensity adjustment system and a control method of an electrically controlled color-changing film on the surface of a self-closed-loop vehicle lamp, belonging to the technical field of automobile lighting. Background Art

[0002] Currently, in real-world driving environments, onboard cameras are susceptible to interference from strong external light (such as oncoming headlights and scorching sunlight), which can cause overexposure of captured images or damage to the sensor. Therefore, it is necessary to suppress the incident light intensity on the onboard camera to address the strong light interference issue.

[0003] Existing technologies include a rotating gradient filter disclosed in Chinese invention patent CN112437209B, and a multi-filter shading element in Chinese invention patent CN112511760B. Both suffer from mechanical delays and physical losses. Furthermore, the mechanical structures are complex, primarily relying on motors or transmission components, resulting in high failure rates and short lifespans (e.g., a motor lifespan of only 50,000 cycles). Furthermore, the mechanical structure has a slow response speed, with mechanical movement typically taking 200ms, making it unable to respond to transient strong light conditions, such as the flashing of oncoming headlights. The mechanical structure also occupies a large space, and installing the filters requires additional space, making it difficult to integrate into compact headlight assemblies. Mechanical filters have a narrow transmittance adjustment range of only 50% to 90%, making them incapable of handling extreme lighting conditions. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the existing technology and provide an electrically controlled color-changing film light intensity adjustment system and control method for the surface of a self-closed-loop vehicle lamp, which realizes the weakening of the incident light intensity of the camera module, has a high spatial integration and an ultra-wide transmittance adjustment range, improves the response speed to transient light intensity, extends the system life, and reduces the system failure rate.

[0005] In order to solve the above technical problems, the technical solution of the present invention is:

[0006] On one hand, the present invention provides a self-closed-loop electric color-changing film light intensity adjustment system for the surface of a vehicle lamp, which includes a lampshade, a camera module, an EC film, an EC driving circuit and an image processing module;

[0007] The camera module is located inside the lampshade and is used to collect images of the vehicle's external environment and the road;

[0008] The image processing module is used to calculate the current incident light intensity of the camera module based on the vehicle external environment and road images collected by the camera module, and dynamically adjust the output voltage of the EC drive circuit according to the current incident light intensity of the camera module;

[0009] The EC film is arranged on the outer surface of the lampshade and is located in the window area of ​​the camera module. The EC driving circuit is electrically connected to the EC film. The EC film adjusts the light transmittance under the action of the output voltage of the EC driving circuit.

[0010] Furthermore, it also includes a heat insulation layer, which is arranged on the inner surface of the lampshade and is used to isolate the heat generated by the car light from the EC film.

[0011] Another aspect of the present invention provides a method for controlling a self-closed-loop, electrically controlled color-changing film light intensity adjustment system on the surface of a vehicle lamp, comprising the following steps:

[0012] Step S1: Calculate the current incident light intensity of the camera module based on the vehicle's external environment and road images collected by the camera module;

[0013] Step S2: Calculate the output voltage of the EC driving circuit based on the current incident light intensity of the camera module;

[0014] Step S3: The EC film adjusts the transmittance according to the output voltage of the EC driving circuit to control the target incident light intensity of the camera module within a preset safety threshold.

[0015] Furthermore, in step S1, the current incident light intensity of the camera module is calculated based on the vehicle external environment and road images collected by the camera module, which specifically includes the following steps:

[0016] The camera module collects images of the vehicle's external environment and road, divides the images into multiple analysis areas, and then calculates the current incident light intensity of the camera module based on the pixel grayscale mean and regional weight coefficient of the multiple analysis areas.

[0017] Furthermore, in step S1, the calculation formula for the current incident light intensity of the camera module is as follows:

[0018] ;

[0019] ;

[0020] in, To traverse multiple analysis areas;

[0021] is the number of analysis areas;

[0022] For the The mean grayscale value of pixels in the analysis area;

[0023] is the regional weight coefficient;

[0024] is the grayscale mapping coefficient;

[0025] is the light intensity mapping coefficient;

[0026] is the current incident light intensity of the camera module;

[0027] is the initial weight coefficient of the region;

[0028] is the weight attenuation steepness coefficient;

[0029] is the credibility threshold;

[0030] For the The credibility index of the analysis area.

[0031] Furthermore, in step S2, the calculation formula of the output voltage of the EC driving circuit is as follows:

[0032] ;

[0033] ;

[0034] in, is the output voltage of the EC drive circuit;

[0035] is the material characteristic constant of the EC film;

[0036] is the maximum light transmittance of the EC film;

[0037] is the minimum light transmittance of the EC film;

[0038] Preset safety threshold for incident light intensity of camera module;

[0039] is the current incident light intensity of the camera module;

[0040] is the optical compensation coefficient.

[0041] Furthermore, the step S1 further includes the following steps:

[0042] When the car lights are turned on, the current incident light intensity of the camera module is calibrated;

[0043] The calculation formula for the current incident light intensity of the calibrated camera module is as follows:

[0044] ;

[0045] in, is the current incident light intensity of the camera module after calibration;

[0046] is the current incident light intensity of the camera module;

[0047] is the optical coupling coefficient;

[0048] The brightness of the headlights.

[0049] Furthermore, a heat-insulating layer is provided on the inner surface of the lampshade, and the thickness of the heat-insulating layer is calculated as follows:

[0050] ;

[0051] in, is the thickness of the insulation layer;

[0052] is the LED thermal power;

[0053] is the allowable temperature rise of the EC film;

[0054] is the area of ​​the EC membrane;

[0055] is the thermal conductivity of the insulation layer.

[0056] Furthermore, the method further comprises the following steps:

[0057] When the EC film fails, it switches to HDR mode, and the camera module continuously captures short exposure frames, medium exposure frames and long exposure frames, and then combines the images of the short exposure frames, medium exposure frames and long exposure frames into an HDR image.

[0058] Furthermore, the steps of synthesizing the images of the short exposure frame, the medium exposure frame, and the long exposure frame into an HDR image specifically include the following steps: intelligently synthesizing the images of the short exposure frame, the medium exposure frame, and the long exposure frame into an HDR image using an image fusion weight formula, wherein the image fusion weight formula is as follows:

[0059] ;

[0060] in, is the image fusion weight coefficient;

[0061] is the fusion steepness coefficient;

[0062] is the pixel gray value;

[0063] is the midtone threshold.

[0064] By adopting the above technical solution, the present invention has the following beneficial effects:

[0065] The present invention sets an EC film on the outer surface of the lampshade, and dynamically adjusts the transmittance of the EC film by adjusting the driving voltage of the EC film, thereby weakening the incident light intensity of the camera module and preventing the image captured by the camera module from being invalid due to overexposure. At the same time, the EC film has an ultra-wide transmittance adjustment range and can cope with extreme lighting scenes. There is no risk of mechanical structure wear and mechanical delay problems, which extends the system life and reduces the system failure rate. It has a millisecond-level response and can cope with transient strong light, making subsequent replacement more convenient. In addition, the influence of the brightness and heat of the car lights themselves is fully considered. By setting a heat-insulating layer on the inner surface of the lampshade, the heat generated by the car lights is isolated from the EC film, avoiding the heat of the car lights affecting the performance of the EC film; by using a correction algorithm for the incident light intensity of the camera module, light source interference to the camera module is avoided after the car lights are turned on. The EC film and the heat-insulating layer are both installed on the surface of the lampshade, and no additional installation space is required, resulting in a high degree of spatial integration. The present invention also provides a failure protection mechanism for the EC film. Even if the EC film is damaged, the "rapid continuous shooting + intelligent photo fusion" method can be used to ensure that the camera module can clearly see the road conditions ahead to ensure driving safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Figure 1 This is a cross-sectional view of the structure of the electrically controlled color-changing film light intensity adjustment system for the self-closed-loop vehicle lamp surface of the present invention;

[0067] Figure 2 This is a functional block diagram of the electrically controlled color-changing film light intensity adjustment system for the self-closed-loop vehicle lamp surface of the present invention;

[0068] Figure 3 This is a flow chart of the control method of the electrically controlled color-changing film light intensity adjustment system on the surface of a self-closed-loop vehicle lamp of the present invention. DETAILED DESCRIPTION

[0069] In order to make the contents of the present invention more clearly understood, the present invention is further described in detail below based on specific embodiments in conjunction with the accompanying drawings.

[0070] Example 1

[0071] like Figure 1 and 2As shown, this embodiment provides a self-closed-loop, electrochromic film light intensity adjustment system for a vehicle lamp surface. The system includes a lampshade 1, a camera module 2 located inside the lampshade 1, an EC film 3 located on the outer surface of the lampshade 1 and within the viewing area of ​​the camera module 2, a thermal insulation layer 4 located on the inner surface of the lampshade 1, an EC drive circuit, an image processing module, and an LED module. In this embodiment, the EC film 3 and thermal insulation layer 4 are both mounted on the surface of the lampshade 1, eliminating the need for additional installation space and achieving a high degree of spatial integration.

[0072] The camera module 2 of this embodiment is used to capture images of the vehicle's external environment and road. In order to avoid optical interference, the window area of ​​the camera module 2 (i.e., the physical opening through which light enters the lens) and the headlight path (i.e., the path through which the light beam emitted by the headlight propagates outward) do not overlap.

[0073] The image processing module of this embodiment is used to calculate the current incident light intensity of the camera module 2 based on the vehicle external environment and road images collected by the camera module 2, and dynamically adjust the output voltage of the EC driving circuit according to the current incident light intensity of the camera module 2.

[0074] The EC film 3 in this embodiment is an intelligent material that changes color and transparency under an applied electric field. It consists of a WO3 (tungsten oxide) ion storage layer and a NiO (nickel oxide) electrochromic layer. By controlling ion migration, the film's color depth and transmittance are adjusted in real time. The EC film 3 is affixed to the exterior of the lampshade 1 using a coating process. An EC driver circuit is electrically connected to the EC film 3. The EC film 3 adjusts its transmittance in response to the EC driver circuit's output voltage and attenuates the current incident light intensity of the camera module 2, thereby keeping the target incident light intensity of the camera module 2 within a preset safety threshold. This attenuation of the incident light intensity prevents overexposure and invalidation of the image captured by the camera module 2.

[0075] The transmittance of the EC film 3 in this embodiment is adjustable from 15% to 90%, offering an ultra-wide dynamic range and adaptability to extreme lighting conditions. Controlling the transmittance of the EC film 3 via the output voltage of the EC driver circuit eliminates the risk of mechanical wear and delay, extending system life and reducing system failure rates. The millisecond-level response (transmittance switching time <50ms) allows for handling transient strong light conditions and facilitates subsequent replacement.

[0076] In this embodiment, since the heat generated by the car lights may affect the performance of the EC film 3, a heat insulation layer 4 is set on the inner surface of the lampshade 1 through coating technology. The material of the heat insulation layer 4 can be nanoporous silica aerogel, which is used to isolate the heat generated by the car lights from the EC film 3. At the same time, the nanoporous silica aerogel has good light transmittance and will not affect the incident light intensity of the camera module 2.

[0077] The EC driving circuit of this embodiment is a circuit specifically used to control the EC film 3. It can change the color and transparency of the EC film 3 through electronic signals. The LED module is used for vehicle lighting.

[0078] Example 2

[0079] like Figure 3 As shown, this embodiment provides a control method for the electrically controlled color-changing film light intensity adjustment system on the surface of a self-closed-loop vehicle lamp as in the first embodiment, comprising the following steps:

[0080] Step S1: Calculating the current incident light intensity of the camera module based on the vehicle's external environment and road images captured by the camera module. Specifically, the steps include: capturing the vehicle's external environment and road images through the camera module, dividing the vehicle's external environment and road images into multiple analysis areas, and then calculating the current incident light intensity of the camera module based on the pixel grayscale mean and regional weight coefficients of the multiple analysis areas;

[0081] At the same time, when the car lights are turned on, it will cause certain light source interference to the camera module, so the current incident light intensity of the camera module needs to be calibrated.

[0082] Specifically, the calculation formula for the current incident light intensity of the camera module is as follows:

[0083] ;

[0084] in, To traverse multiple analysis areas;

[0085] is the number of analysis areas;

[0086] For the The average grayscale value of each pixel in the analysis area ranges from 0 to 255;

[0087] is the regional weight coefficient, which is determined by the spatial location and content;

[0088] Grayscale mapping coefficient, used to adjust the visual effect of the image, by changing the gray value of each pixel in the image to enhance or transform the image, can be obtained through calibration, when ISP configuration, The configuration is 0.08;

[0089] It is the light intensity mapping coefficient, which is used to convert the pixel grayscale value (0~255) captured by the camera into the physical light intensity value, solving the nonlinear response problem of the camera module. It can be obtained through calibration. When configuring the ISP, Configuration is 1.5;

[0090] The current incident light intensity of the camera module.

[0091] Specifically, regarding the regional weight coefficient In this embodiment, the vehicle's external environment and road image are divided into five analysis regions: sky region R1, road region R2, side environment region R3, headlight spot region R4, and dynamic object region R5. Sky region R1 reflects the primary source of ambient background illumination; road region R2 is a secondary light source used to detect ground reflections or shadows; side environment region R3 is buildings or vegetation used to supplement ambient light; headlight spot region R4 is an interference source and should be completely eliminated; and dynamic object region R5 is a temporary light source used to detect reflections from moving objects. A dynamic weighting mechanism is used to further strengthen the decision-making power of regions with high credibility in the algorithm. For regions with low credibility, the decision weight is significantly reduced to mitigate the negative impact of interference regions. In real-world environments, it is very likely that the camera's field of view will be dirty or obstructed. In the face of such a sudden drop in credibility, the real-time attenuation of weights can dynamically and quickly adapt to changes in driving conditions, improving the robustness of the system.

[0092] Specifically, the regional weight coefficient The calculation formula is as follows:

[0093] ;

[0094] in, is the initial weight coefficient of the region, which is set based on the priority of optical contribution. In this embodiment, the initial weight coefficients of the sky region R1, road region R2, side environment region R3, headlight spot region R4, and dynamic object region R5 are set to 0.35, 0.25, 0.2, 0, and 0.2, respectively;

[0095] The weight attenuation steepness coefficient is a sensitivity regulator for HDR fusion weight attenuation. It is obtained through calibration and dynamically iterated. The default setting is 2.0.

[0096] is the credibility threshold, which is set to 0.7 by default;

[0097] and It is an open calibration interface that can adapt to the optical requirements of different models. Different models have different camera positions and lampshade shapes, and they encounter different ambient light conditions. For example, off-road vehicles often go on muddy roads, and the camera is easily blocked by mud and water. In this case, the , while the sports car pursues fast response, at this time you can increase value;

[0098] For the The credibility index of each analysis area is the core indicator of dynamic quantification of the effectiveness of the image area. It is used to evaluate the reliability of the data collected by the camera module in each analysis area in the current environment. The algorithm is used to determine in real time whether the area is disturbed or invalid, thereby dynamically adjusting the weight of the area in the light intensity calculation.

[0099] Specifically, the credibility index of each analysis area Adopting independent calculation strategy, credibility index The calculation formula is as follows:

[0100] ;

[0101] ;

[0102] Edge pixel ratio;

[0103] ;

[0104] ;

[0105] in, is the credibility index of the sky region R1;

[0106] is the credibility index of the road area R2;

[0107] is the credibility index of the side environment area R3;

[0108] is the credibility index of the headlight spot area R4;

[0109] is the credibility index of the dynamic object region R5;

[0110] The blue channel mean represents the average blue intensity value of all pixels in this independent data channel. In a common RGB color model image, there are three channels: red, green, and blue. Each channel contains pixel intensity information related to the corresponding color. They are combined to form a complete color image. The blue channel mean is used to avoid misidentifying gray-white clouds as sky.

[0111] is the regional grayscale standard deviation, which is used to describe the uniformity of image grayscale distribution;

[0112] The edge pixel ratio represents the ratio of edge pixels to the total number of pixels in the entire image. Edge pixels refer to pixels with significant grayscale changes in the image. A high edge density indicates the presence of objects such as buildings or trees.

[0113] is the grayscale change between frames, indicating the difference between two consecutive frames (from Frame to The change in the grayscale value of a pixel in a frame. The smaller the change, the higher the stability.

[0114] Specifically, the calculation formula for the current incident light intensity of the calibrated camera module is as follows:

[0115] ;

[0116] in, is the current incident light intensity of the camera module after calibration;

[0117] is the current incident light intensity of the camera module;

[0118] is the optical coupling coefficient, obtained through calibration;

[0119] The brightness of the headlights.

[0120] Step S2: Based on the current incident light intensity of the camera module, the output voltage of the EC driving circuit is calculated. By dynamically adjusting the output voltage of the EC driving circuit to control the transmittance of the EC film, the incident light intensity of the camera module is weakened to prevent the camera from failing due to overexposure.

[0121] Specifically, the calculation formula for the output voltage of the EC drive circuit is as follows:

[0122] ;

[0123] ;

[0124] in, is the output voltage of the EC drive circuit;

[0125] is the material characteristic constant of the EC film. In this embodiment, It is 0.35V / dec, which means that when the driving voltage increases by 0.35V, the migration rate of the material ions will increase by 10 times;

[0126] The maximum light transmittance of the EC film is generally 90%;

[0127] The minimum light transmittance of the EC film is generally 15%;

[0128] A preset safety threshold for the incident light intensity of the camera module. In this embodiment, the preset safety threshold for the incident light intensity is 20,000 lux;

[0129] is the current incident light intensity of the camera module;

[0130] is the optical compensation coefficient. In this embodiment, the compensation for the effects of EC film aging and ambient temperature is taken into account. Set to 0.9~1.1.

[0131] In step S3, the EC film adjusts the transmittance according to the output voltage of the EC driving circuit, controls the target incident light intensity of the camera module within a preset safety threshold, thereby weakening the incident light intensity of the camera module and preventing the image collected by the camera module from being invalid due to overexposure.

[0132] In addition, the heat generated by the headlights may affect the performance of the EC film, so an insulation layer is provided on the inner surface of the lampshade. The thickness of the insulation layer is calculated as follows:

[0133] ;

[0134] in, is the thickness of the insulation layer;

[0135] LED thermal power, determined by the structure and LED selection;

[0136] The temperature rise allowed for the EC membrane is generally ≤30°C;

[0137] The area of ​​the EC film is determined by the camera's installation position and visual range;

[0138] is the thermal conductivity of the insulation layer, and .

[0139] This embodiment also incorporates a failure protection mechanism for the EC film. If the EC film fails, the system switches to HDR mode. HDR mode, referring to high dynamic range imaging, achieves a wider exposure dynamic range than conventional digital imaging technology, meaning greater differences between light and dark. By combining multiple photos at varying exposures, it preserves more detail in both highlights and shadows. Even if the EC film is damaged, the system ensures that the camera module can clearly see road conditions ahead, ensuring driving safety through a combination of rapid continuous shooting and intelligent photo fusion.

[0140] First, the camera module continuously captures short, medium, and long exposure frames. A quick short-exposure shot captures the brightest parts (such as glaring sunlight or car lights), preventing them from being completely white (overexposed). A medium-exposure shot captures parts of normal brightness (such as road signs and vehicle bodies). A slow long-exposure shot captures the darkest parts (such as pedestrians in the shadows or the road at night), ensuring they are clearly visible and not completely black.

[0141] Then, the image fusion weight formula is used to intelligently synthesize the short exposure frame, medium exposure frame and long exposure frame images into an HDR image. The core function is to automatically select the optimal pixel information from the three different exposure photos through mathematical rules to synthesize an HDR image that is neither overexposed nor underexposed.

[0142] Specifically, the image fusion weight formula is as follows:

[0143] ;

[0144] in, is the image fusion weight coefficient, which is used to represent the importance of different image information;

[0145] The fusion steepness coefficient represents the smoothness controller of the image brightness transition, which is set manually or adaptively according to the scene requirements to avoid visual artifacts;

[0146] is the pixel gray value;

[0147] It is the mid-tone threshold, representing the physical dividing point of the image brightness distribution. It is dynamically obtained through statistical methods and determines the benchmark position of the enhancement algorithm.

[0148] The working principle of the present invention is as follows:

[0149] Based on the vehicle's external environment and road images collected by the camera module, the current incident light intensity of the camera module is calculated; based on the current incident light intensity of the camera module, the output voltage of the EC drive circuit is calculated; the EC film adjusts the transmittance according to the output voltage of the EC drive circuit.

[0150] The present invention sets an EC film on the outer surface of the lampshade, and dynamically adjusts the transmittance of the EC film by adjusting the driving voltage of the EC film, thereby weakening the incident light intensity of the camera module and preventing the image captured by the camera module from being invalid due to overexposure. At the same time, the EC film has an ultra-wide transmittance adjustment range and can cope with extreme lighting scenes. There is no risk of mechanical structure wear and mechanical delay problems, which extends the system life and reduces the system failure rate. It has a millisecond-level response and can cope with transient strong light, making subsequent replacement more convenient. In addition, the influence of the brightness and heat of the car lights themselves is fully considered. By setting a heat-insulating layer on the inner surface of the lampshade, the heat generated by the car lights is isolated from the EC film, avoiding the heat of the car lights affecting the performance of the EC film; by using a correction algorithm for the incident light intensity of the camera module, light source interference to the camera module is avoided after the car lights are turned on. The EC film and the heat-insulating layer are both installed on the surface of the lampshade, and no additional installation space is required, resulting in a high degree of spatial integration. The present invention also provides a failure protection mechanism for the EC film. Even if the EC film is damaged, the "rapid continuous shooting + intelligent photo fusion" method can be used to ensure that the camera module can clearly see the road conditions ahead to ensure driving safety.

[0151] The specific embodiments described above further illustrate the technical problems, technical solutions and beneficial effects solved by the present invention. It should be understood that the above are only specific embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A self-closed loop electric color-changing film light intensity adjustment system for the surface of a vehicle lamp, characterized in that: It includes a lampshade (1), a camera module (2), an EC film (3), an EC driving circuit and an image processing module; The camera module (2) is located inside the lampshade (1) and is used to capture images of the vehicle's external environment and the road; The image processing module is used to calculate the current incident light intensity of the camera module (2) based on the vehicle external environment and road images collected by the camera module (2), and dynamically adjust the output voltage of the EC driving circuit according to the current incident light intensity of the camera module (2); The EC film (3) is arranged on the outer surface of the lampshade (1) and is located in the window area of ​​the camera module (2); the EC driving circuit is electrically connected to the EC film (3); and the EC film (3) adjusts the light transmittance under the action of the output voltage of the EC driving circuit; The control method of the electrochromic film light intensity adjustment system comprises the following steps: Step S1: Calculate the current incident light intensity of the camera module based on the vehicle's external environment and road images collected by the camera module; Step S2: Calculate the output voltage of the EC driving circuit based on the current incident light intensity of the camera module; Step S3: The EC film adjusts the transmittance according to the output voltage of the EC driving circuit to control the target incident light intensity of the camera module within a preset safety threshold; The calculation formula for the current incident light intensity of the camera module is as follows: ； ； in, To traverse multiple analysis areas; is the number of analysis areas; For the The mean grayscale value of pixels in the analysis area; is the regional weight coefficient; is the grayscale mapping coefficient; is the light intensity mapping coefficient; is the current incident light intensity of the camera module; is the initial weight coefficient of the region; is the weight attenuation steepness coefficient; is the credibility threshold; For the The credibility index of the analysis area.

2. The self-closed-loop electric-controlled color-changing film light intensity adjustment system for the surface of a vehicle lamp according to claim 1 is characterized in that: It also includes a heat insulation layer (4), which is arranged on the inner surface of the lampshade (1) and is used to isolate the heat generated by the vehicle lamp from the EC film (3).

3. The self-closed-loop electric-controlled color-changing film light intensity adjustment system for the surface of a vehicle lamp according to claim 1 is characterized in that: In step S2, the output voltage of the EC driving circuit is calculated as follows: ； ； in, is the output voltage of the EC drive circuit; is the material characteristic constant of the EC film; is the maximum light transmittance of the EC film; is the minimum light transmittance of the EC film; Preset safety threshold for incident light intensity of camera module; is the current incident light intensity of the camera module; is the optical compensation coefficient.

4. The self-closed-loop, electrically controlled color-changing film light intensity adjustment system for a vehicle lamp surface according to claim 1, characterized in that: The step S1 further includes the following steps: When the car lights are turned on, the current incident light intensity of the camera module is calibrated; The calculation formula for the current incident light intensity of the calibrated camera module is as follows: ； in, is the current incident light intensity of the camera module after calibration; is the current incident light intensity of the camera module; is the optical coupling coefficient; The brightness of the headlights.

5. The self-closed-loop, electrically controlled color-changing film light intensity adjustment system for a vehicle lamp surface according to claim 1, characterized in that: The inner surface of the lampshade is provided with a heat insulation layer, and the thickness of the heat insulation layer is calculated as follows: ； in, is the thickness of the insulation layer; is the LED thermal power; is the allowable temperature rise of the EC film; is the area of ​​the EC membrane; is the thermal conductivity of the insulation layer.

6. The self-closed-loop, electrically controlled color-changing film light intensity adjustment system for a vehicle lamp surface according to claim 1, characterized in that: The following steps are also included: When the EC film fails, it switches to HDR mode, and the camera module continuously captures short exposure frames, medium exposure frames and long exposure frames, and then combines the images of the short exposure frames, medium exposure frames and long exposure frames into an HDR image.

7. The self-closed-loop, electrically controlled color-changing film light intensity adjustment system for a vehicle lamp surface according to claim 6, characterized in that: The method of synthesizing the images of the short exposure frame, the medium exposure frame, and the long exposure frame into an HDR image specifically includes the following steps: using an image fusion weight formula to intelligently synthesize the images of the short exposure frame, the medium exposure frame, and the long exposure frame into an HDR image, and the image fusion weight formula is as follows: ； in, is the image fusion weight coefficient; is the fusion steepness coefficient; is the pixel gray value; is the midtone threshold.

Images