Adaptive system and method for optimizing head-up display imaging brightness

Abstract

The invention discloses an adaptive system and method for optimizing head-up display imaging brightness, and the system comprises a basic brightness module which is used for querying a preset mapping relation between ambient brightness and a brightness control signal according to the current ambient brightness outside a vehicle, and obtaining an initial brightness control signal, corresponding to the current ambient brightness, of a head-up display; and the brightness correction module is used for performing compensation calculation on the basis of the initial brightness control signal according to the pupil diameter of the driver, generating a final brightness control signal of the head-up display, and adjusting the backlight brightness of the head-up display according to the final brightness control signal.

Description

Technical Field

[0001] This invention relates to the field of head-up display (HUD) imaging brightness control, specifically to an adaptive system and method for optimizing HUD imaging brightness. Background Technology

[0002] With the development of automotive intelligence, head-up display (HUD) systems project driving information into the driver's field of vision, improving driving safety and convenience. To ensure clear and non-glaring imaging under different ambient light conditions, the HUD's brightness needs to automatically adjust according to the external environment. Existing technologies use a brightness sensor to collect ambient brightness and adjust the preset value of the HUD brightness based on the maximum ambient brightness, while also considering and processing the influence of interfering light sources such as vehicle taillights. However, this approach has the following shortcomings: First, interfering light sources in the real environment are not limited to vehicle taillights; for example, periodically appearing streetlights on both sides of the road can also cause interference, affecting the accuracy of ambient brightness judgment. Second, since the preset value of the HUD brightness adjusted based on the maximum ambient brightness is fixed, the adjustable range of the system brightness is limited. In practical applications, when the ambient brightness is significantly higher or lower than this preset range, the HUD imaging may be too dim, making it difficult for the driver to see, or too bright, causing eye discomfort, affecting driving safety and user experience. Summary of the Invention

[0003] The purpose of this invention is to provide an adaptive system for optimizing head-up display (HUD) imaging brightness, and a method for optimizing HUD imaging brightness. This system and method can solve the problem that, due to the accuracy of the rain sensor or the sunlight sensor built into the HUD, or complex external environmental factors (such as under the shade of trees), the external environment brightness is high but the imaging brightness is low, or the external environment brightness is low but the imaging brightness is high, which makes it difficult for the driver to see the image comfortably or clearly.

[0004] To achieve this objective, the present invention provides an optimized head-up display imaging brightness adaptive system, comprising: The basic brightness module is used to query the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle, and obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. The brightness correction module is used to perform compensation calculations based on the initial brightness control signal according to the driver's pupil diameter, generate the final brightness control signal of the head-up display, and adjust the backlight brightness of the head-up display according to the final brightness control signal.

[0005] Furthermore, the current ambient brightness outside the vehicle is monitored in real time by a rain sensor or a sunlight sensor configured on the head-up display.

[0006] Furthermore, the method for obtaining the preset mapping relationship between ambient brightness and brightness control signals includes: placing the vehicle in a preset direction under a preset environment and a preset time period; measuring the initial ambient brightness outside the vehicle at the start of the preset time period; setting different head-up display brightness control signals under the initial ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; when the change in ambient brightness outside the vehicle based on the initial ambient brightness meets a set numerical interval, setting different head-up display brightness control signals under the corresponding ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; and creating a curve or one-dimensional mapping table between the ambient brightness outside the vehicle and the corresponding head-up display brightness control signals to obtain the preset mapping relationship between ambient brightness and brightness control signals.

[0007] Furthermore, the method for obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle includes: recording the maximum and minimum values ​​of the ambient brightness outside the vehicle within a preset time period in a preset environment; dividing the ambient brightness outside the vehicle into multiple ambient brightness intervals according to the maximum and minimum values ​​and a preset interval; assigning a corresponding brightness control signal to each ambient brightness interval according to the preset mapping relationship between ambient brightness and brightness control signal; and obtaining the corresponding head-up display brightness control signal based on the ambient brightness interval to which the current ambient brightness outside the vehicle belongs, which serves as the initial brightness control signal of the head-up display corresponding to the current ambient brightness.

[0008] Furthermore, after obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal through the current ambient brightness outside the vehicle, the initial brightness control signal is compensated and calculated according to the change in the driver's pupil diameter to generate the final brightness control signal of the head-up display.

[0009] Furthermore, the diameter of the human eye pupil is obtained in real time through a camera installed on the dashboard facing the driver's position and processed through image analysis.

[0010] Furthermore, the method for generating the final brightness control signal of the head-up display by compensating the initial brightness control signal based on the change in the driver's pupil diameter includes: when the driver's pupil diameter A collected in real time satisfies 2≤A≤4mm, the final brightness control signal of the head-up display imaging brightness is a reduction of B=400-100A based on the initial brightness corresponding to the initial brightness control signal.

[0011] Furthermore, when the driver's pupil diameter A, which is collected in real time, satisfies 4 < A ≤ 8 mm, the final brightness control signal for the head-up display imaging brightness is B = 800 - 100A, which is added to the initial brightness corresponding to the initial brightness control signal.

[0012] Furthermore, an optimized head-up display imaging brightness adaptive method based on the system includes: Based on the current ambient brightness outside the vehicle, the mapping relationship between the preset ambient brightness and the brightness control signal is queried to obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. Based on the driver's pupil diameter, a compensation calculation is performed on the initial brightness control signal to generate the final brightness control signal for the head-up display, and the backlight brightness of the head-up display is adjusted according to the final brightness control signal.

[0013] The beneficial effects of this invention are as follows: Existing technologies suffer from limitations in the adjustable range of head-up display (HUD) brightness due to fixed preset values ​​based solely on the maximum ambient brightness. Furthermore, brightness imbalances caused by sensor inaccuracies or complex environmental factors (such as shade) can lead to discomfort for the driver or difficulty in clearly recognizing HUD information. This invention addresses these issues by first performing basic calibration adjustments based on ambient brightness, followed by dynamic compensation through real-time monitoring of the driver's pupil diameter. Utilizing the physiological characteristic of the human pupil's contraction and dilation in response to changes in ambient light intensity (constriction to 2-4mm in strong light and dilation to 4-8mm in weak light) as direct feedback on the final brightness requirement, and by performing secondary corrections to the backlight brightness based on the established relationship between pupil diameter and brightness compensation, this invention overcomes the limitations of a single ambient brightness sensor in adjusting HUD brightness. It expands the accuracy of adaptive HUD brightness adjustment, ensuring that the display brightness always adaptively adjusts to the optimal level for the driver's current visual comfort under different external lighting conditions and individual differences, thereby improving driving visual comfort and safety. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the process of the present invention; Figure 2 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0015] 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 a part of the embodiments of the present invention, not all of them. Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to represent selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0016] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1 like Figure 2 As shown, an optimized head-up display imaging brightness adaptive system includes: The basic brightness module is used to query the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle, and obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. The brightness correction module is used to perform compensation calculations based on the initial brightness control signal according to the driver's pupil diameter, generate the final brightness control signal of the head-up display, and adjust the backlight brightness of the head-up display according to the final brightness control signal.

[0017] In some technical solutions, the current ambient brightness outside the vehicle is monitored in real time by a rain sensor or a sunlight sensor configured on the head-up display.

[0018] The system monitors the ambient light outside the vehicle in real time using a rain sensor or the light sensor built into the head-up display, providing continuous and timely ambient light data input so that the brightness adjustment module of the head-up display system can respond quickly according to the actual changes in the external light.

[0019] In some technical solutions, the method for obtaining the preset mapping relationship between ambient brightness and brightness control signal includes: placing the vehicle in a preset direction under a preset environment and a preset time period; measuring the initial ambient brightness outside the vehicle at the start of the preset time period; setting different head-up display brightness control signals under the initial ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; when the change in ambient brightness outside the vehicle based on the initial ambient brightness meets a set numerical interval, setting different head-up display brightness control signals under the corresponding ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; and creating a curve or one-dimensional mapping table between the ambient brightness outside the vehicle and the corresponding head-up display brightness control signals to obtain the preset mapping relationship between ambient brightness and brightness control signal.

[0020] By systematically collecting data at predetermined brightness change intervals under preset environmental conditions, time periods, and vehicle orientation, and recording corresponding brightness control signals based on human visual comfort, a curve or one-dimensional mapping table is created to establish a precise, reliable, and directly corresponding fundamental mapping relationship between ambient brightness and brightness control signals that corresponds to human visual perception. A standardized calibration process ensures data consistency and repeatability across different test scenarios, enabling the obtained mapping relationship to comprehensively cover various actual lighting scenarios from dawn to dusk. This provides calibrated data for the primary brightness adaptive adjustment of the head-up display imaging system, allowing the system to quickly and automatically output a baseline brightness control signal that guarantees basic image clarity and human visual comfort for most common ambient lighting changes, based on the preset mapping relationship between ambient brightness and brightness control signals.

[0021] In some embodiments, the calibration process is as follows: Calibration is generally best performed in summer, on a sunny day, when the range of ambient light intensity varies most widely throughout the day, the light is stable, and the coverage of the widest range of operating conditions is greatest. The vehicle equipped with the head-up display is positioned east-west and remains in the same position to align with the sun's rising and setting pattern. This ensures that the ambient light received by the vehicle (including light intensity, incident angle, etc.) is continuous and stable throughout the entire calibration period from morning to night. This allows the collected ambient brightness and comfort brightness control signal data to systematically cover various actual driving lighting scenarios throughout the day, from morning sidelight and midday overhead light to evening side-backlight, making the established mapping relationship more comprehensive and reliable. The surrounding environment is open and the vehicle is unobstructed to avoid sunlight blockage that could cause the calibrated ambient light intensity range to deviate from the actual environment. The vehicle is in ignition mode, and the head-up display is on. From 8:00 AM to 8:00 PM (fully covering the complete cycle of natural daylight from dawn, noon to dusk. During this period, the solar azimuth and altitude angles continuously change, simulating various typical lighting scenarios that vehicles may encounter in actual use, from low-angle oblique strong light to midday overhead light, and then to soft evening light), calibration personnel used Canoe equipment (a bus development device) and OBD (On-Board Diagnostics) diagnostic wiring to connect the host computer and the vehicle. The parameters controlling the LED (Light Emitting Diode) backlight were modified through the host computer. The calibration process is as follows: First, after measuring the real-time ambient light intensity outside the vehicle at 8:00 AM, technicians manually adjusted the LED backlight parameters (including but not limited to the duty cycle of the PWM signal, i.e., the brightness control signal) on a host computer. Based on the human eye's observation of the image brightness, three brightness control signals—brighter, moderate, and dimmer—were recorded. Then, at every 200 brightness values ​​of the real-time ambient light intensity outside the vehicle, the technicians manually adjusted the LED backlight parameters on the host computer for each real-time ambient light intensity, recording the three brightness control signals (brighter, moderate, and dimmer) based on the human eye's observation of the image brightness, until the calibration was completed at 8:00 PM. After calibration, the calibration personnel organized the recorded calibration data and formed a coordinate curve, obtaining the preset mapping curve between ambient brightness and the brightness control signal.

[0022] In some technical solutions, the method of obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle includes: recording the maximum and minimum values ​​of the ambient brightness outside the vehicle within a preset time period in a preset environment; dividing the ambient brightness outside the vehicle into multiple ambient brightness intervals according to the maximum and minimum values ​​and a preset interval; assigning a corresponding brightness control signal to each ambient brightness interval according to the preset mapping relationship between ambient brightness and brightness control signal; and obtaining the corresponding head-up display brightness control signal according to the ambient brightness interval to which the current ambient brightness outside the vehicle belongs, which serves as the initial brightness control signal of the head-up display corresponding to the current ambient brightness.

[0023] By pre-dividing the continuously changing ambient brightness range into multiple discrete intervals and matching each interval with a specific brightness control signal (selectable from three brightness control signals: brighter, moderate, and darker), the system's response speed and control reliability are improved. The system eliminates the need for complex real-time calculations; it can quickly output the corresponding initial brightness control signal through simple interval comparison and lookup table matching. This effectively avoids frequent, abrupt brightness adjustments caused by minor fluctuations in ambient brightness, ensuring smooth changes in display brightness and driver visual comfort. While maintaining basic adaptive adjustment performance, it significantly reduces the computational resource requirements of the vehicle controller.

[0024] In some embodiments, the method for discretizing ambient brightness intervals and allocating corresponding brightness control signals includes: the ambient brightness range throughout the day is from 0 lux (illuminance unit: lux) to 10000 lux, and the ambient brightness interval is divided into intervals of 400 lux, resulting in a total of 25 brightness intervals. The median value of each ambient brightness interval is used to query a preset mapping curve between ambient brightness and brightness control signals, and the corresponding brightness control signal in the mapping curve is allocated to that ambient brightness interval. For example, if the current ambient brightness is 720 lux, 720 lux belongs to the (400 lux, 800 lux) interval, the brightness control signal corresponding to the median value of 600 lux in the (400 lux, 800 lux) interval is taken as the initial brightness control signal.

[0025] Due to inherent accuracy limitations of rain sensors or the sunlight sensors integrated into head-up displays (HUDs), or complex external environmental factors (such as being in the shade), there can be instances where the ambient light is high but the HUD image brightness is low, or vice versa. This can result in drivers not being able to comfortably see the HUD image or seeing it clearly. Therefore, based on the calibration results, the image brightness is further adjusted by monitoring the size of the human pupil.

[0026] In some technical solutions, after obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal through the current ambient brightness outside the vehicle, the initial brightness control signal is compensated and calculated according to the change of the driver's pupil diameter to generate the final brightness control signal of the head-up display.

[0027] The human eye's pupil adjusts its size according to the intensity of external light. Normally, the pupil size is 2-8 mm. The size of the pupil determines the amount of light entering the eye. In bright light, the pupil usually constricts to 2-4 mm, while in dim light, it usually dilates to 4-8 mm.

[0028] By incorporating the driver's real-time pupil diameter as a feedback parameter, the initial brightness control signal obtained based on ambient brightness mapping is dynamically compensated, effectively overcoming the inherent limitations of relying solely on external ambient brightness sensors for adjustment. When the ambient light measurement deviates from the driver's actual perception of lighting conditions due to sensor accuracy limitations or the vehicle briefly entering shaded areas or tunnels, the system can adjust the HUD imaging brightness compensation based on the physiological contraction or dilation of the pupil (pupil constriction indicates excessive light, pupil dilation indicates insufficient light). This means adjusting the brightness of the HUD imaging (i.e., reducing brightness when the light is too strong and increasing brightness when the light is insufficient), achieving more precise and personalized brightness adaptation at the subjective level of the human eye. Ultimately, this ensures that the head-up display maintains a clear, comfortable, and fatigue-free visual presentation for the driver in any complex, changing, or perceptually flawed driving lighting environment.

[0029] In some technical solutions, the diameter of the human eye pupil is obtained by real-time acquisition of data from a camera installed on the dashboard at the driver's position and through image analysis and processing.

[0030] A camera is installed on the dashboard directly facing the driver. After capturing the driver's eye information, the camera's image analysis algorithm automatically outputs the driver's pupil diameter value. By installing a camera on the dashboard directly facing the driver to capture real-time images of the driver's face and obtaining accurate pupil diameter through image analysis, physiological parameters reflecting the actual amount of light entering the driver's eyes and visual adaptation state can be directly obtained. This provides a closed-loop feedback signal for the brightness adjustment of the head-up display system, independent of external environmental physical measurements and based on the driver's real-time visual perception needs. This allows the head-up imaging display system to effectively overcome the problem of inaccurate environmental brightness judgment caused by factors such as environmental sensor accuracy errors and complex external lighting conditions (such as tree shade, tunnel entrances, and oncoming headlights). It achieves secondary compensation adjustment of the head-up imaging brightness, ensuring that the imaging brightness of the head-up display matches the driver's real-time light perception state, significantly improving visual clarity, comfort, and driving safety.

[0031] In some technical solutions, the method for generating the final brightness control signal of the head-up display (HUD) by compensating the initial brightness control signal based on the change in the driver's pupil diameter includes: when the real-time acquired driver pupil diameter A satisfies 2≤A≤4mm, the final brightness control signal of the HUD imaging brightness is a reduction of B=400-100A from the initial brightness corresponding to the initial brightness control signal. That is, when 2≤A≤4mm, for every 0.5mm decrease in the pupil value, the HUD backlight brightness is reduced by B=50 nits from the initial brightness.

[0032] When the driver gets into the vehicle and starts the head-up display, the diameter of their pupil A (2≤A≤4mm) is collected, and the initial brightness control signal is compensated according to B=400-100A. At this time, the driver's pupil is in a small state due to the contraction caused by adapting to strong light, indicating that their visual system has entered the physiological adaptation stage of high ambient brightness. Based on the driver's actual physiological reaction, the brightness of the HUD image can be accurately compensated in reverse (i.e., the smaller the pupil, the greater the compensation increase B), thereby effectively offsetting the impact of the decrease in human eye perception contrast under strong light environment and ensuring the visual recognition of the head-up image display under any strong light conditions.

[0033] In some technical solutions, when the real-time acquired driver pupil diameter A satisfies 4 < A ≤ 8 mm, the final brightness control signal for the head-up display (HUD) is the initial brightness based on the initial brightness control signal plus B = 800 - 100A. That is, when 4 < A ≤ 8 mm, for every 0.5 mm increase in pupil value, the HUD backlight brightness increases by B = 50 nits based on the initial brightness.

[0034] When the driver's pupil diameter A is detected to be greater than 4mm and less than or equal to 8mm, the final brightness control signal is calculated according to the formula B=800-100A. This addresses the physiological dilation of the human pupil in low-light environments, allowing the head-up display system to further compensate based on the driver's real-time visual state, building upon the initial adjustment based on ambient light. When the pupil dilates due to darkness (A value increases), the brightness adjustment B calculated by this formula decreases accordingly. The actual control effect is to increase the backlight brightness of the head-up display beyond the base brightness, effectively compensating for the decreased sensitivity of the human eye to light signals in dark environments and preventing the head-up display content from being difficult to see due to deviations in external ambient brightness judgment or individual differences.

[0035] In some embodiments, the process of the present invention is as follows Figure 1 As shown: First, a camera installed inside the vehicle captures the driver's facial image in real time, and the key value of the driver's pupil diameter is extracted by the image analysis and processing unit. Simultaneously, a sunlight sensor located outside the vehicle continuously monitors the ambient light intensity. Both of these real-time data streams are received by a CAN signal receiver and transmitted to the central head-up display (HUD) processing unit via CAN signals. The processing unit has a pre-calibrated mapping relationship between ambient brightness and brightness control signals, which determines a basic brightness control signal based on ambient light. Then, based on the real-time acquired driver pupil diameter, a brightness compensation amount is calculated according to a corresponding preset formula (e.g., B=400-100A or B=800-100A). Based on this brightness compensation amount and the aforementioned basic brightness control signal, a final brightness control signal that better matches the driver's instantaneous visual sensitivity is generated. This signal is finally sent to the LED backlight control unit to dynamically adjust the brightness of the HUD's LED backlight, ensuring clear visibility of information display while maximizing visual comfort and driving safety in complex and changing lighting environments.

[0036] Example 2 An optimized head-up display imaging brightness adaptive method based on the system includes: Based on the current ambient brightness outside the vehicle, the mapping relationship between the preset ambient brightness and the brightness control signal is queried to obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. Based on the driver's pupil diameter, a compensation calculation is performed on the initial brightness control signal to generate the final brightness control signal for the head-up display, and the backlight brightness of the head-up display is adjusted according to the final brightness control signal.

[0037] Example 3 The present invention provides a computer-readable storage medium storing a computer program, which, when executed by a processor, performs the steps of the method described in Embodiment 2.

[0038] This invention can be implemented wholly or partially through software, hardware, firmware, or any combination thereof. When implemented in software, it can be implemented wholly or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this invention are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., a solid-state drive (SSD)).

[0039] Those skilled in the art will readily understand that the above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, combinations, substitutions, improvements, etc., made under the spirit and principles of the present invention are included within the protection scope of the present invention.

[0040] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

Claims

1. An optimized head-up display imaging brightness adaptive system, characterized in that, It includes: The basic brightness module is used to query the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle, and obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. The brightness correction module is used to perform compensation calculations based on the initial brightness control signal according to the driver's pupil diameter, generate the final brightness control signal of the head-up display, and adjust the backlight brightness of the head-up display according to the final brightness control signal.

2. The optimized head-up display imaging brightness adaptive system according to claim 1, characterized in that: The current ambient brightness outside the vehicle is monitored in real time by a rain sensor or a sunlight sensor configured on the head-up display.

3. The optimized head-up display imaging brightness adaptive system according to claim 2, characterized in that: The method for obtaining the preset mapping relationship between ambient brightness and brightness control signal includes: placing the vehicle in a preset direction under a preset environment and a preset time period; measuring the initial ambient brightness outside the vehicle at the start of the preset time period; setting different head-up display brightness control signals under the initial ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; when the change in ambient brightness outside the vehicle based on the initial ambient brightness meets a set numerical interval, setting different head-up display brightness control signals under the corresponding ambient brightness; recording the head-up display brightness control signals that meet the preset requirements; and creating a curve graph or a one-dimensional mapping table between the ambient brightness outside the vehicle and the corresponding head-up display brightness control signals to obtain the preset mapping relationship between ambient brightness and brightness control signal.

4. The optimized head-up display imaging brightness adaptive system according to claim 3, characterized in that: The method for obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle includes: recording the maximum and minimum values ​​of the ambient brightness outside the vehicle within a preset time period in a preset environment; dividing the ambient brightness outside the vehicle into multiple ambient brightness intervals according to the maximum and minimum values ​​and a preset interval; assigning a corresponding brightness control signal to each ambient brightness interval according to the preset mapping relationship between ambient brightness and brightness control signal; and obtaining the corresponding head-up display brightness control signal according to the ambient brightness interval to which the current ambient brightness outside the vehicle belongs, which serves as the initial brightness control signal of the head-up display corresponding to the current ambient brightness.

5. The optimized head-up display imaging brightness adaptive system according to claim 4, characterized in that: After obtaining the initial brightness control signal of the head-up display corresponding to the current ambient brightness by querying the preset mapping relationship between ambient brightness and brightness control signal based on the current ambient brightness outside the vehicle, the initial brightness control signal is compensated and calculated according to the change in the driver's pupil diameter to generate the final brightness control signal of the head-up display.

6. The optimized head-up display imaging brightness adaptive system according to claim 5, characterized in that: The diameter of the human eye pupil is obtained in real time through a camera installed on the dashboard facing the driver's position and processed by image analysis.

7. An optimized head-up display imaging brightness adaptive system according to claim 5 or 6, characterized in that: The method for generating the final brightness control signal of the head-up display by compensating the initial brightness control signal based on the change in the driver's pupil diameter includes: when the driver's pupil diameter A collected in real time satisfies 2≤A≤4mm, the final brightness control signal of the head-up display imaging brightness is a reduction of B=400-100A based on the initial brightness corresponding to the initial brightness control signal.

8. The optimized head-up display imaging brightness adaptive system according to claim 7, characterized in that: When the driver's pupil diameter A, which is collected in real time, satisfies 4 < A ≤ 8 mm, the final brightness control signal of the head-up display is the initial brightness corresponding to the initial brightness control signal plus B = 800 - 100A.

9. A method for optimizing head-up display imaging brightness adaptation based on the system of claim 1, characterized in that, include: Based on the current ambient brightness outside the vehicle, the mapping relationship between the preset ambient brightness and the brightness control signal is queried to obtain the initial brightness control signal of the head-up display corresponding to the current ambient brightness. Based on the driver's pupil diameter, a compensation calculation is performed on the initial brightness control signal to generate the final brightness control signal for the head-up display, and the backlight brightness of the head-up display is adjusted according to the final brightness control signal.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method of claim 9.

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