Method and apparatus for evaluating visual comfort of an electronic outside mirror monitor

Abstract

The application discloses a visual comfort evaluation method and device of an electronic outside rearview mirror monitor, and relates to the technical field of vehicles. The method comprises the following steps: obtaining the score of each visual comfort check item of the electronic outside rearview mirror monitor to be evaluated; performing weighted calculation on the score of each visual comfort check item according to a preset weight corresponding to each visual comfort check item, so as to obtain the overall visual comfort score of the electronic outside rearview mirror monitor to be evaluated; and evaluating the visual comfort of the electronic outside rearview mirror monitor based on the overall visual comfort score. The application constructs a systematic, objective and operable visual comfort evaluation system of the electronic outside rearview mirror monitor, covers all-dimensional problems such as glare, imaging, field obstruction and whitening, and improves the accuracy and comprehensiveness of the visual comfort evaluation by means of quantitative indexes and weight distribution, so as to meet the requirements of driving safety and mass production design.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to a method and apparatus for evaluating the visual comfort of an electronic exterior rearview mirror monitor. Background Technology

[0002] As the automotive industry rapidly evolves towards intelligent and electric vehicles, the limitations of traditional physical exterior rearview mirrors in terms of wind resistance control, field of vision expansion, and intelligent integration are becoming increasingly apparent. To overcome this bottleneck, camera-monitor systems (CMS, or electronic exterior rearview mirrors) have emerged. Electronic exterior rearview mirror monitors collect road condition information from the sides and rear of the vehicle using external cameras, process the information, and display it in real-time on an in-vehicle monitor. This not only effectively reduces vehicle wind resistance (reducing energy consumption) and narrows the vehicle's width (improving maneuverability in narrow roads), but also eliminates blind spots in traditional rearview mirrors through algorithmic optimization, significantly enhancing driving safety and convenience.

[0003] With the formal implementation of the national standard GB15084—2022 "Performance and Installation Requirements for Indirect Vision Devices of Motor Vehicles," which clarifies the performance indicators and safety requirements of camera-monitor systems, a compliance basis has been provided for the large-scale application of electronic exterior rearview mirrors in the domestic passenger vehicle sector, promoting its transition from technological research and development to mass production. As the core interactive interface for drivers to obtain side and rear view information, the visual attributes of the electronic exterior rearview mirror monitor directly determine the application effect of the CMS (Content Management System). For example, drivers need to frequently observe the monitor to assess road conditions while driving; if the monitor's visual performance is flawed, it will directly affect the efficiency of information acquisition and may even lead to driving safety risks.

[0004] However, significant technical shortcomings remain in the current research and evaluation of electronic exterior rearview mirror monitors within the industry. Current technologies focus only on the basic functions and installation compliance of the CMS (Content Management System), lacking a systematic evaluation method for the monitor's visual comfort. Alternatively, evaluations of visual comfort rely on subjective human experience, lacking objective measurement criteria, resulting in inaccurate and incomplete evaluations that fail to meet the needs of driving safety and mass production design. Summary of the Invention

[0005] To address the aforementioned issues, this application provides a method and apparatus for evaluating the visual comfort of electronic exterior rearview mirror monitors. It establishes a systematic, objective, and operable evaluation system for the visual comfort of electronic exterior rearview mirror monitors, covering all dimensions of issues such as glare, imaging, field of vision obstruction, and white cast. By quantifying indicators and assigning weights to clarify evaluation standards, it improves the accuracy and comprehensiveness of visual comfort evaluation, thereby meeting the needs of driving safety and mass production design.

[0006] The embodiments of this application disclose the following technical solutions:

[0007] In a first aspect, embodiments of this application provide a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, including:

[0008] Obtain the score for each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; wherein, the visual comfort verification item includes one or more verification items corresponding to glare, imaging, field of view obstruction and white cast respectively; the score for each visual comfort verification is obtained based on the corresponding scoring criteria.

[0009] According to the preset weights corresponding to each visual comfort test item, the scores of each visual comfort test item are weighted and calculated to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated.

[0010] The visual comfort of the electronic exterior rearview mirror monitor is evaluated based on the overall visual comfort score.

[0011] In one possible implementation, the verification items corresponding to the glare include: glare on the monitor's LCD area and glare on the trim; the verification items corresponding to the imaging include: imaging on the front windshield and imaging on the monitor's LCD screen; the verification items corresponding to the field of view obstruction include: direct field of view; and the verification items corresponding to the whitening include: whitening on the monitor's LCD area.

[0012] In one possible implementation, the glare score of the monitor's liquid crystal area is obtained in the following manner:

[0013] Based on a preset incident light, the reflective area corresponding to the ten extreme boundary points of the human eye ellipse is detected, and the largest reflective area among the ten extreme boundary points is taken as the target reflective area.

[0014] The glare percentage is obtained by calculating the percentage of the reflective area of ​​the target relative to the area of ​​the liquid crystal region;

[0015] Based on the glare percentage, the glare score of the monitor's LCD area is obtained according to the preset glare scoring standard for the monitor's LCD area.

[0016] In one possible implementation, the dazzling score of the trim is obtained in the following way:

[0017] Using any one of the ten extreme boundary points of the human eye ellipse or the center point of the human eye ellipse as the human eye verification point, verify whether the preset incident light will be reflected by the trim strip to the human eye detection point.

[0018] Based on the verification result of whether the incident light will be reflected by the trim to the human eye detection point, the dazzling score of the trim is obtained.

[0019] In one possible implementation, the score of the monitor's imaging of the front windshield is obtained in the following manner:

[0020] The monitor's imaging position on the windshield corresponds to the ten extreme boundary points of the human eye ellipse, and the lowest imaging position among the imaging positions corresponding to the ten extreme boundary points is taken as the target imaging position.

[0021] Based on the target imaging position and the standard-defined windshield area, the score of the monitor's imaging in the windshield is obtained according to the preset scoring criteria.

[0022] In one possible implementation, the score of the monitor's LCD screen image is obtained in the following manner:

[0023] Based on the imaging light source to be verified, the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse are detected; wherein, the imaging light source to be verified includes: instrument backlight, button backlight, ambient light, other light-emitting LCD screens and metal ornaments.

[0024] The maximum imaging area of ​​the monitor LCD screen is obtained by taking the envelope of the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse.

[0025] Based on the location of the maximum imaging area of ​​the monitor LCD screen on the monitor LCD screen and the percentage of the area of ​​the maximum imaging area of ​​the monitor LCD screen to the area of ​​the monitor LCD screen, a score for the monitor LCD screen imaging is obtained according to a preset scoring standard for the monitor LCD screen imaging.

[0026] In one possible implementation, the score of the direct view is obtained as follows:

[0027] Using the driver's eye point specified in the standard as the verification eye point, the area obstructed by the obstructing component to be verified on the monitor is detected; wherein, the driver's eye point specified in the standard is: two points that are 635mm vertically extended upward from the reference point of the driver's seat, and perpendicular to the longitudinal reference plane of the vehicle and 65mm apart.

[0028] Based on the area of ​​the monitor obstructed by the obstructing component to be verified, the score of the direct field of view is obtained according to the preset scoring standard for the direct field of view.

[0029] In one possible implementation, the whitening of the monitor's liquid crystal area is achieved in the following way:

[0030] Based on the preset incident light, detect the potential whitening area corresponding to the center point of the human eye ellipse;

[0031] Calculate the percentage of the area of ​​the potential whitening region relative to the area of ​​the monitor's LCD screen to obtain the whitening percentage;

[0032] Based on the percentage of whitening, a score for the whitening of the monitor's liquid crystal area is obtained according to a preset scoring standard for whitening of the monitor's liquid crystal area.

[0033] In one possible implementation, evaluating the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score includes:

[0034] Determine whether the overall visual comfort score is greater than a preset score threshold;

[0035] When the overall visual comfort score is greater than the preset score threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor meets the requirements.

[0036] If the overall visual comfort score is not greater than a preset score threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor does not meet the requirements.

[0037] Secondly, embodiments of this application provide a visual comfort evaluation device for an electronic exterior rearview mirror monitor, comprising:

[0038] The acquisition module is used to acquire the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; wherein, the visual comfort verification item includes one or more verification items corresponding to glare, imaging, field of view obstruction and whiteness respectively;

[0039] The calculation module is used to perform weighted calculation on the score of each visual comfort test item according to the preset weight corresponding to each visual comfort test item, so as to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated.

[0040] The evaluation module is used to evaluate the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score.

[0041] Compared with existing technologies, this application has the following advantages: It constructs a systematic, objective and operable visual comfort evaluation system for electronic exterior rearview mirror monitors, covering all dimensions of problems such as glare, imaging, field of vision obstruction, and white cast. By clarifying the evaluation criteria through quantitative indicators and weight allocation, it improves the accuracy and comprehensiveness of visual comfort evaluation, thereby meeting the needs of driving safety and mass production design. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] Figure 1 A flowchart illustrating a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, provided in an embodiment of this application;

[0044] Figure 2 A flowchart illustrating the method for obtaining a score for the dazzling effect of a monitor's LCD area, as provided in an embodiment of this application;

[0045] Figure 3 Example diagram of ten extreme boundary points of the human eye ellipse provided for embodiments of this application;

[0046] Figure 4 An example diagram of the reflective area of ​​the monitor's liquid crystal region provided in an embodiment of this application;

[0047] Figure 5 A flowchart illustrating the scoring method for the dazzling decorative strips provided in this application embodiment;

[0048] Figure 6 A flowchart illustrating the scoring method for the monitor's imaging in the windshield provided in this application embodiment;

[0049] Figure 7 A flowchart illustrating the scoring method for monitor LCD screen imaging provided in this application embodiment;

[0050] Figure 8 A flowchart illustrating the method for obtaining a score of direct view provided in an embodiment of this application;

[0051] Figure 9 A flowchart illustrating the scoring method for obtaining the whitening of the monitor's liquid crystal area provided in this application embodiment;

[0052] Figure 10 This is a schematic diagram of the structure of a visual comfort evaluation device for an electronic exterior rearview mirror monitor, provided in an embodiment of this application. Detailed Implementation

[0053] As described earlier, current technology systems focus only on the basic functions and installation compliance of CMS, lacking a systematic evaluation method for monitor visual comfort. Alternatively, evaluations of visual comfort often rely on subjective human experience, lacking objective measurement criteria. This results in inaccurate and incomplete evaluations, failing to meet the needs of driving safety and mass production design. For example, visual comfort evaluation dimensions are incomplete; most solutions focus only on a single issue (such as only checking glare), easily overlooking critical factors that also affect safety, such as imaging and whitening, leading to loopholes in the overall visual comfort assessment. Furthermore, evaluations of visual comfort often depend on engineers' subjective experience, such as perceived insignificance of glare, lacking unified and objective measurement criteria.

[0054] Furthermore, due to the lack of a systematic evaluation framework, when faced with visual comfort issues, passive remedial measures are often adopted (such as reducing the reflection of the entertainment screen and upgrading the rear window to privacy glass, which can alleviate the problem but significantly increase the cost per vehicle), instead of optimizing from the design source.

[0055] This application provides a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, comprising: obtaining the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; calculating the weighted average of the scores of each visual comfort verification item according to the preset weights corresponding to each visual comfort verification item, thereby obtaining the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated; and evaluating the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score. A systematic, objective, and operable visual comfort evaluation system for electronic exterior rearview mirror monitors is constructed, covering all dimensions of issues such as glare, imaging, field of view obstruction, and white cast. By clarifying the evaluation criteria through quantitative indicators and weight allocation, the accuracy and comprehensiveness of the visual comfort evaluation are improved, thereby meeting the needs of driving safety and mass production design.

[0056] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present application.

[0057] Example 1:

[0058] The following is combined with Figures 1-9 This application provides a detailed description of a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, as provided in the embodiments of this application.

[0059] like Figure 1As shown in the embodiments of this application, a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor includes the following steps:

[0060] S101. Obtain the score for each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated.

[0061] The visual comfort verification items include one or more verification items corresponding to glare, imaging, visual field obstruction, and whitening, respectively.

[0062] The score for each visual comfort test is obtained based on the corresponding scoring criteria.

[0063] Because electronic exterior rearview mirror monitors are the key interactive interface for drivers to obtain information about road conditions to the sides and rear, visual comfort directly determines the efficiency of information acquisition and driving safety. Therefore, electronic exterior rearview mirror monitors are considered the core object of human-machine visual comfort inspection. Furthermore, the visual comfort issues of electronic exterior rearview mirror monitors are categorized into glare, imaging, field of vision obstruction, and white cast.

[0064] Glare refers to excessively bright light within the driver's field of vision, causing eye discomfort. This light primarily originates from sunlight shining directly through the car windows onto highly reflective surfaces inside the vehicle. After being reflected again by these components, it enters the driver's eyes, creating glare. Brief glare makes it difficult for the driver to discern details of objects observed on monitors (such as vehicles to the side and rear, or road conditions); prolonged glare can easily cause eye fatigue and even lead to a decline in visual function, directly impacting driving safety.

[0065] Reflection, also known as windshield projection, refers to the reflection formed on the windshield (front windshield, side windshields) or electronic rearview mirror monitor screen after light from inside / outside the vehicle shines on specific components. This reflection can interfere with the driver's accurate identification of road conditions. For nighttime imaging, the light source is an active light-emitting component inside the vehicle, including the instrument cluster backlight, button backlight, ambient lighting, and other luminous LCD screens (such as entertainment screens). This light source mainly causes reflections on the surfaces of the windshield and side windshields, or on the electronic rearview mirror monitor screen. For daytime imaging, the light source is sunlight or external ambient light. External ambient light shines directly on the surface of interior components (such as levers, pillar covers, steering wheel spokes), and after secondary reflection, it is projected onto the windshield or monitor screen, producing a veil effect (similar to a screen covered with a thin veil, affecting display clarity).

[0066] Obstruction of view refers to the phenomenon where a driver's direct view of the electronic exterior rearview mirror monitor (for obtaining crucial information such as road conditions and vehicle status to the side and rear) is obstructed by components inside the vehicle, resulting in incomplete information acquisition from the monitor. The main components causing obstruction of view include: the steering wheel, the driver's arms, and the gear shift mechanism.

[0067] Washout / haze refers to the phenomenon where ambient light (mainly sunlight) shines directly onto the screen (or instrument panel) of the electronic rearview mirror monitor through the windshield or window glass, causing diffuse reflection. This results in reduced screen contrast, decreased readability, or even rendering the information unreadable. Severe washout can make it difficult for the driver to read road information on the monitor, affecting driving judgment and even jeopardizing vehicle safety.

[0068] In one possible implementation, the verification items corresponding to glare include: glare on the monitor LCD area and glare on the trim; the verification items corresponding to imaging include: imaging of the monitor on the windshield and imaging of the monitor LCD screen; the verification items corresponding to field of view obstruction include: direct field of view; the verification items corresponding to whitening include: whitening of the monitor LCD area.

[0069] The above verification items are designed to comprehensively and systematically cover various potential issues related to the visual comfort of electronic exterior rearview mirror monitors, ensuring that their impact on driving safety and experience is assessed from different dimensions. Because different components and scenarios can trigger different types of visual interference, only by verifying each item individually can omissions be avoided, ultimately guaranteeing the efficiency and safety of drivers in obtaining road condition information.

[0070] Regarding the calibration items for glare, monitor LCD glare refers to the phenomenon where ambient light or external light enters through the car window glass and is reflected off the monitor LCD screen, creating a strong glare area that enters the driver's eyes, causing eye discomfort and difficulty in distinguishing details. Trim glare refers to the phenomenon where highly reflective trim strips inside the vehicle (such as electroplated or high-gloss painted trim strips) reflect external light, creating strong glare that enters the driver's eyes. Even small trim strips can cause significant interference due to their reflective materials.

[0071] Regarding the verification items related to imaging, "monitor image on the windshield" refers to the reflection of the screen light from the electronic exterior rearview mirror monitor onto the windshield, which may interfere with the driver's judgment of road conditions. "Monitor LCD screen image" refers to the reflection of other light sources inside the vehicle (such as instrument panel backlight, ambient lighting, and entertainment screen) onto the screen of the electronic exterior rearview mirror monitor, which may seriously interfere with the driver's reading of information from the electronic exterior rearview mirror monitor.

[0072] For the verification items related to obstructed field of vision, direct field of vision refers to the phenomenon where in-vehicle components (such as the steering wheel and arms) directly obstruct the field of vision of the electronic exterior rearview mirror monitor, preventing the driver from obtaining complete road condition information.

[0073] Regarding the verification item corresponding to whitening, whitening of the monitor's LCD area refers to the phenomenon where sunlight shines directly on the screen of the electronic rearview mirror monitor, causing diffuse reflection, which leads to a decrease in screen display contrast and reduced information readability. In extreme cases, it may make road condition information completely unreadable.

[0074] In this embodiment, the visual comfort verification items cover glare, imaging, field of view obstruction, and whitening, encompassing all scenarios affecting visual comfort. Different verification items target different visual problems to support a comprehensive evaluation of the visual comfort of the electronic exterior rearview mirror monitor. Simply put, the glare verification item focuses on the problem of strong light reflection entering the eyes, a direct threat to visual safety; the imaging verification item focuses on scenarios where reflections interfere with road condition recognition, potentially severely obscuring the field of view; the field of view obstruction verification item focuses on the integrity of the field of view, affecting driving safety compliance; and the whitening verification item is a key experience indicator under extreme lighting conditions.

[0075] Furthermore, the score for each visual comfort verification item is based on its corresponding scoring criteria. That is, the scores are based on clear quantitative standards rather than subjective feelings. Quantitative scoring can avoid the ambiguity of traditional "experience-based evaluation", allowing monitors of different models and different design schemes to be compared horizontally, and can also provide precise improvement directions for design optimization.

[0076] S102. According to the preset weights corresponding to each visual comfort test item, the scores of each visual comfort test item are weighted and calculated to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated.

[0077] The preset weights corresponding to each visual comfort verification item are pre-set based on the degree of impact of the visual comfort verification item on driving safety and the industry's priority. For example, they are determined through expert evaluation, user surveys, or regulatory requirements.

[0078] To facilitate understanding, the following examples, using Table 1 as a reference, illustrate the criteria for the overall visual comfort score.

[0079] Table 1

[0080]

[0081] As shown in Table 1, the highest overall visual comfort score is 5 points. The closer the overall visual comfort score is to 5 points, the worse the visual comfort of the electronic exterior rearview mirror monitor is; otherwise, the worse the visual comfort of the electronic exterior rearview mirror monitor is.

[0082] When the visual comfort test items include: glare corresponding to monitor LCD area glare and trim glare; imaging corresponding to monitor imaging on the windshield and monitor LCD screen imaging; field of view obstruction corresponding to direct field of view; and whitening corresponding to monitor LCD area whitening, the importance of the visual comfort test items is as follows: monitor LCD area glare > direct field of view > trim glare ≈ monitor LCD screen imaging ≈ monitor LCD screen whitening > monitor imaging on the windshield.

[0083] Glare from the monitor's LCD screen poses the greatest threat to driver safety, as it directly causes strong light to enter the eyes. Therefore, it has the highest importance / priority. Direct visibility is related to regulatory compliance and driving safety; obstructing the view directly leads to information loss, so it ranks second in importance / priority. Glare from trim strips can easily create localized strong light, which, although small in area, is quite disruptive. The monitor's LCD screen image may directly interfere with the reading of core road condition information. At the same time, a white cast on the monitor's LCD screen reduces screen readability and affects information acquisition in extreme scenarios. Therefore, trim strip glare, monitor LCD screen image, and monitor LCD screen white cast have similar levels of interference with driver safety and information acquisition, and thus, they are ranked third in importance / priority. The monitor's image on the windshield interferes with the driver's vision and may interfere with safe driving, so it ranks last in importance / priority.

[0084] For example, suppose the preset weight for glare on the monitor's LCD screen is 25%, the preset weight for glare on the trim is 15%, the preset weight for the monitor's image on the windshield is 10%, the preset weight for the monitor's LCD screen image is 15%, the preset weight for the direct field of view is 20%, the preset weight for whitening on the monitor's LCD screen is 15%, and the sum of the preset weights for all visual comfort verification items is 100%.

[0085] Assuming the monitor's LCD screen glare is rated 4 points, the trim glare is rated 5 points, the monitor's image quality on the windshield is rated 3 points, the monitor's LCD screen image quality is rated 4 points, the direct view is rated 5 points, and the monitor's LCD screen bleeds 3 points.

[0086] Therefore, the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated is 4×25%+5×15%+3×10%+4×15%+5×20%+3×15%=4.1 points.

[0087] In one possible implementation, it is determined in advance whether the score of each visual comfort verification item is lower than its corresponding pass threshold. When the score of a certain visual comfort verification item is lower than its corresponding pass threshold, the part corresponding to that visual comfort verification item can be improved first, and the score corresponding to that visual comfort verification item can be obtained again.

[0088] S103. Evaluate the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score.

[0089] The overall visual comfort score is a quantitative result obtained by weighting the scores of four verification items: "dazzle, imaging, field of view obstruction, and white cast". It can be directly used as the core basis for judging whether the visual comfort of the electronic exterior rearview mirror monitor under evaluation meets the design goals and safety requirements.

[0090] In one possible implementation, it is determined whether the overall visual comfort score is greater than a preset scoring threshold; if the overall visual comfort score is greater than the preset scoring threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor meets the requirements; if the overall visual comfort score is not greater than the preset scoring threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor does not meet the requirements.

[0091] The preset scoring threshold serves as the baseline for determining whether the visual comfort of the electronic exterior rearview mirror monitor is "qualified" or "unqualified." This preset threshold is comprehensively set by considering ergonomic safety requirements, industry benchmarks, and vehicle usage scenarios, ensuring that it meets both safety standards and industry-leading user experience levels.

[0092] For example, ergonomic safety requirements refer to prioritizing driver visual safety, referencing implicit requirements for visual clarity and interference control in regulations such as GB15084—2022 "Performance and Installation Requirements for Indirect Vision Devices in Motor Vehicles" and GB11555—2009 "Performance and Test Methods for Defrosting and Defogging Systems of Automotive Windshields," to avoid driving safety risks caused by insufficient visual comfort. Industry competitor benchmarks refer to surveying the visual comfort score distribution of electronic exterior rearview mirror monitors in the same vehicle class. Vehicle usage scenarios refer to the possibility of appropriately increasing the score threshold for specific usage scenarios (such as vehicles frequently driven in bright light environments or vehicles targeting middle-aged and elderly users) to enhance visual comfort redundancy; for basic commuter vehicles, the score threshold can be maintained to balance design costs and user experience.

[0093] Specifically, when the overall visual comfort score is greater than the preset score threshold, it indicates that the electronic exterior rearview mirror monitor's comprehensive performance in the dimensions of "glare, imaging, field of vision obstruction, and white cast" meets or exceeds the design visual comfort requirements. This ensures that the driver does not experience significant visual discomfort or safety hazards when obtaining road condition information during daily driving, and is therefore judged as "visual comfort meets the requirements." For example: if the overall visual comfort score of the monitor is 3.95 points and the preset score threshold is 3 points, since 3.95 points > 3 points, the visual comfort of the electronic exterior rearview mirror monitor under evaluation is judged to meet the requirements.

[0094] Specifically, when the overall visual comfort score is not greater than the preset scoring threshold, it indicates that the electronic exterior rearview mirror monitor has a significant deficiency in at least one of the following dimensions: "glare, imaging, obstructed view, and white cast." This may lead to problems such as driver visual fatigue and difficulty in recognizing road conditions while driving, or even violate relevant regulations. Therefore, it is judged as "visual comfort does not meet the requirements." For example: the overall score of the monitor to be evaluated is 2.8 points, and the preset scoring threshold is 3 points. Since 2.8 points < 3 points, it is judged that the visual comfort of the electronic exterior rearview mirror monitor to be evaluated does not meet the requirements.

[0095] Furthermore, if it is determined that the visual comfort of the electronic exterior rearview mirror monitor being evaluated does not meet the requirements, the scores of each visual comfort verification item can be further reviewed to pinpoint the shortcomings and optimize the design accordingly. For example, if the score for dazzling trim is 1 point, then the material of the trim can be replaced with a low-reflective material.

[0096] In one possible implementation, if the visual comfort of the electronic exterior rearview mirror monitor to be evaluated meets the requirements, it can proceed to the next stage of verification (such as prototype vehicle road testing and user experience surveys). If no new visual comfort issues are found during road testing, the design solution can be finalized and mass production can proceed. If the visual comfort of the electronic exterior rearview mirror monitor to be evaluated meets the requirements, priority should be given to optimizing visual comfort verification items with "high weight + low score." After optimization, the overall score should be recalculated until the score threshold is met. If multiple optimizations still fail to meet the standards, the core design solutions, such as the monitor's placement and material selection, need to be re-evaluated.

[0097] The above combination Figure 1 This application provides a detailed description of the visual comfort evaluation method for an electronic exterior rearview mirror monitor, as illustrated in the embodiments below. Figures 2-9 This document details how the scores for each visual comfort verification item are obtained in the embodiments of this application.

[0098] The following is combined with Figures 2-4 This paper provides an example of how to obtain a dazzling score for the monitor's LCD area in an embodiment of this application.

[0099] S201. Based on the preset incident light, detect the reflective area corresponding to the ten extreme boundary points of the human eye ellipse, and take the largest reflective area among the ten extreme boundary points as the target reflective area.

[0100] The preset incident light refers to the light that may enter the vehicle from all windows (including windshields, side windows, and rear window) except for the sunroof. During simulation, the scenario of this light entering the vehicle from outside through the window glass and reflecting off components such as the electronic rearview mirror monitor must be considered. Specifically, the simulation of the preset incident light is usually based on optical simulation software (such as TracePro and OpticStudio), which simulates light entering from the windows in a real environment by setting light source parameters (light angle, intensity, etc.), and then simulates the reflective area of ​​this light on the monitor's LCD screen.

[0101] Among them, the ten extreme boundary points of the human eye ellipse are key feature points of the "95% eye ellipse" defined by the SAE J941 standard. They are used to cover the range of eye positions of drivers under different body types and sitting postures, ensuring the comprehensiveness of visual comfort verification.

[0102] To make it easier to understand, the following will be combined with... Figure 3 Let me give you an example of the ten extreme boundary points of the human eye ellipse.

[0103] Specifically, the ten extreme boundary points of the human eye ellipse include: the vertices in the four directions of the ellipse (up, down, left, and right); the boundary points of the four quadrants of the ellipse; and the endpoints of the major and minor axes of the ellipse. These points together constitute the extreme boundary of the SAE 95% eye ellipse, covering all driver eye position conditions, thus ensuring the comprehensiveness and rigor of the evaluation.

[0104] like Figure 3 As shown, point 1 is the leftmost vertex of the left ellipse, representing the leftmost extreme position of the driver's eye; point 10 is the rightmost vertex of the right ellipse, representing the rightmost extreme position of the driver's eye; point 7 is the topmost vertex of the left ellipse, representing the topmost extreme position of the driver's eye; point 2 is the bottommost vertex of the right ellipse, representing the bottommost extreme position of the driver's eye. Point 5 is the boundary point of the upper left quadrant of the left ellipse, covering the upper left eye position limit; point 3 is the boundary point of the lower left quadrant of the right ellipse, covering the lower left eye position limit; point 9 is the boundary point of the upper right quadrant of the right ellipse, covering the upper right eye position limit; point 4 is the boundary point of the lower right quadrant of the right ellipse, covering the lower right eye position limit. Point 8 is the midpoint where the major axes of the two ellipses intersect, representing the extreme position in the forward-backward direction of the eye; point 6 is the key endpoint of the minor axis of the right ellipse, helping to define the shape boundary of the ellipse.

[0105] Taking a critical boundary point as an example, this critical boundary point is set as the observation point for the human eye. The system tracks how light rays, after being reflected from the monitor, enter this observation point. It automatically identifies the areas of the monitor's LCD screen covered by these reflected rays, marks them as reflective areas, and calculates the area of ​​all reflective areas to obtain the reflective area corresponding to the critical boundary point. For example,... Figure 4 As shown, the reflective areas of the monitor's LCD area include: the reflective area caused by light from the left front window, the reflective area caused by light from the right rear window, and the reflective area caused by light from the rear windshield.

[0106] Specifically, the largest reflective area among the reflective areas corresponding to the ten extreme boundary points is taken as the target reflective area. This means that the worst glare condition of the monitor's LCD area is used as the evaluation benchmark, thereby covering all extreme visual interference scenarios for drivers. This avoids design defects caused by the omission of individual points and ensures that the electronic rearview mirror monitor can control the threat of glare to driving safety at all possible eye positions of the drivers, even in the most reflective scenarios. It also avoids driver visual fatigue, difficulty in recognizing road conditions, or even the risk of accidents caused by ignoring extreme situations.

[0107] S202. Calculate the percentage of the reflective area of ​​the target to the area of ​​the liquid crystal area to obtain the glare percentage.

[0108] Specifically, glare percentage = target reflective area / liquid crystal area × 100%. For example, the liquid crystal area of ​​an electronic rearview mirror monitor is 100 cm², and the maximum reflective area (target reflective area) corresponding to the ten extreme boundary points of the human eye ellipse is 8 cm². Therefore, glare percentage = (8 / 100) × 100% = 8%.

[0109] S203. Based on the glare percentage, obtain the glare score of the monitor LCD area according to the preset glare scoring standard.

[0110] Specifically, the higher the glare percentage of the monitor's LCD area, the more severe the glare, and the lower the glare score.

[0111] The preset scoring criteria for the dazzling effect of the monitor's LCD screen are shown in Table 2:

[0112] Table 2

[0113]

[0114] As shown in Table 2, if the glare percentage is >35%, the glare score for the monitor's LCD area is 1 point; if the glare percentage is between 5% and 35%, the score is 2 to 4 points (the score can be refined within the range of 2 to 4 points based on how close the actual percentage is to the upper or lower limit of the range, for example, 2 points for close to 35% and 4 points for close to 5%); if the glare percentage is ≤5%, the score is 5 points.

[0115] The following is combined with Figure 5 This paper provides an example of how to obtain a score for the dazzling decorative strips in an embodiment of this application.

[0116] S501. Using any one of the ten extreme boundary points of the human eye ellipse or the center point of the human eye ellipse as the human eye verification point, verify whether the preset incident light will be reflected by the trim strip to the human eye detection point.

[0117] Specifically, any one of the extreme boundary points or the center point of the eye ellipse is selected as the detection benchmark (covering typical scenarios of the driver's eye position). The incident light from all glass surfaces except the sunroof (such as sunlight entering the vehicle through side windows, rear windshield, etc.) is simulated. Through optical simulation or actual testing, the system tracks whether the incident light enters the human eye detection point after being reflected once by trim strips (such as electroplated trim strips or high-gloss painted trim strips).

[0118] S502. Based on the verification result of whether the incident light will be reflected by the trim to the human eye detection point, a score for the dazzling effect of the trim is obtained.

[0119] The preset scoring criteria for the dazzling effect of the monitor's LCD screen are shown in Table 2:

[0120] Specifically, if light is reflected once from the trim and enters the human eye detection point (determined as trim glare), the trim glare score is 1-4 points; specifically, the score can be refined according to the reflective area and material reflectivity of the trim; for example, a large reflective area and high material reflectivity score 1 point, while a small reflective area and low material reflectivity score 4 points; if no light is reflected from the trim and enters the human eye detection point (determined as trim glare not present), the trim glare score is 5 points.

[0121] The following is combined with Figure 6 This application provides an example of how a score is obtained from the monitor's imaging of the windshield.

[0122] S601. Detect the imaging positions of the monitor on the windshield corresponding to the ten extreme boundary points of the human eye ellipse, and take the lowest imaging position among the imaging positions corresponding to the ten extreme boundary points as the target imaging position.

[0123] The image position of the monitor on the windshield refers to the position where the screen light of the electronic exterior rearview mirror monitor forms a reflection on the windshield. The closer this position is to the bottom of the windshield (i.e., "lower"), the more likely it is to intrude into the driver's core field of vision. The driver's core field of vision refers to the windshield areas B and A according to GB 11555 standards, which are key areas for defrosting, defogging, and road condition observation.

[0124] Specifically, the lowest imaging position among the ten extreme boundary points is selected. The more likely it is to intrude into Zone B, the greater the interference with road condition recognition. The worst working conditions closest to the core area of ​​the field of view (Zone B) are used as the evaluation benchmark, thereby ensuring that the monitor's scoring of the front windshield imaging can cover all working conditions, thus ensuring the rigor of the scoring.

[0125] S602. Based on the target imaging position and the standard-defined windshield area, obtain the score of the monitor imaging in the windshield according to the preset scoring standard for monitor imaging in the windshield.

[0126] The standard definition of the front windshield position refers to windshield zones B and A in the GB 11555 standard.

[0127] Specifically, the lower the target imaging position, the more severe the monitoring imaging on the windshield, and the lower the monitor imaging score on the windshield.

[0128] The preset scoring criteria for the dazzling effect of the monitor's LCD screen are shown in Table 3:

[0129] Table 3

[0130]

[0131] As shown in Table 3, if the target imaging position falls within the standard-defined front windshield position, the monitor scores 1 point for the front windshield imaging; if the target imaging position is within 30mm of the standard-defined front windshield position, the monitor scores 2-3 points for the front windshield imaging; if the target imaging position is more than 30mm above the standard-defined front windshield position, the monitor scores 4-5 points for the front windshield imaging.

[0132] The following is combined with Figure 7 This application provides an example of how a score for the image on a monitor's LCD screen is obtained.

[0133] S701. Based on the imaging light source to be verified, detect the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse.

[0134] The imaging light sources to be tested include: instrument backlight, button backlight, ambient light, other luminous LCD screens, and metal ornaments.

[0135] Specifically, for ten extreme boundary points, through optical simulation or actual vehicle testing, the imaging area (i.e. the screen area covered by the reflection) formed on the monitor LCD screen after the light from the above-mentioned imaging light source to be verified is tracked after reflection, and the position and area of ​​each imaging area on the monitor LCD screen are recorded.

[0136] S702. Take the envelope of the imaging area of ​​the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse, and obtain the maximum imaging area of ​​the monitor LCD screen.

[0137] Here, envelope taking refers to spatially merging the imaging regions corresponding to the ten extreme boundary points to form a maximum outer envelope region covering all single-point imaging regions, which is the maximum imaging region of the monitor's LCD screen. The maximum imaging region is the maximum possible interference range formed by the light source to be verified on the monitor's LCD screen under all extreme eye positions of the driver, representing the worst imaging interference conditions.

[0138] S703. Based on the location of the maximum imaging area of ​​the monitor LCD screen on the monitor LCD screen and the percentage of the area of ​​the maximum imaging area of ​​the monitor LCD screen to the area of ​​the monitor LCD screen, a score for the monitor LCD screen imaging is obtained according to a preset score standard for monitor LCD screen imaging.

[0139] Specifically, the lower the position of the maximum imaging area on the monitor's LCD screen and the larger the percentage of the maximum imaging area to the total area of ​​the monitor's LCD screen, the more severe the imaging and the lower the monitor's imaging score.

[0140] The preset scoring criteria for monitor LCD screen imaging are shown in Table 4:

[0141] Table 4

[0142]

[0143] As shown in Table 4, if the largest imaging area of ​​the monitor's LCD screen is located in the lower 2 / 3 of the monitor's LCD screen, or if the percentage of the largest imaging area to the total area of ​​the monitor's LCD screen is greater than 20%, then the monitor's LCD screen imaging score is 1 point; if the largest imaging area of ​​the monitor's LCD screen is located in the upper 1 / 3 of the monitor's LCD screen, and the percentage of the largest imaging area to the total area of ​​the monitor's LCD screen is 5% to 20%, then the monitor's LCD screen imaging score is 2 to 4 points; if the largest imaging area of ​​the monitor's LCD screen is located at the edge of the monitor's LCD screen, or if the percentage of the largest imaging area to the total area of ​​the monitor's LCD screen is less than 5%, then the monitor's LCD screen imaging score is 1 point.

[0144] The following is combined with Figure 8 This paper provides an example of how the direct field of view score is obtained in an embodiment of this application.

[0145] S801. Using the driver's eye point specified in the standard as the verification eye point, detect the area of ​​obstruction of the monitor by the obstruction component to be verified.

[0146] The standard specifies the driver's eye point as two points that are 635mm vertically extended upwards from the reference point of the driver's seat, perpendicular to the longitudinal reference plane of the vehicle, and 65mm apart.

[0147] Specifically, the driver's eye point specified in the standard refers to the two key points of the driver's field of vision reference defined in GB 15084—2022 "Performance and Installation Requirements of Indirect Vision Devices for Motor Vehicles". The reference point (R point) of the driver's seat is taken as the starting point (R point is the reference position of the seat design, representing the center point of contact between the driver's buttocks and the seat during normal driving); extend vertically upward from R point 635mm (approximately the vertical distance from the eyes to the buttocks of an adult in a sitting position); at this height, two points are determined: perpendicular to the longitudinal reference plane of the vehicle (i.e., the plane of symmetry in the front-rear direction of the vehicle), and the distance between the two points is 65mm (approximately the interpupillary distance of an adult).

[0148] The standard specifies driver eye points that simulate the positions of the left and right eyes during driving, serving as benchmark observation points for detecting direct obstruction of the field of vision.

[0149] Among them, the obstructing components to be verified refer to in-vehicle components that may obstruct the driver's view of the electronic exterior rearview mirror monitor, preventing the driver from fully obtaining the side and rear road condition information displayed on the monitor. For example, obstructing components to be verified include the steering wheel, driver's arm, gear shift mechanism, etc.

[0150] Specifically, in the simulation software, the 3D model of the vehicle interior (including the monitor and the obstructing component to be verified), the driver's eye coordinates, and the "field of view area" of the monitor are imported; starting from the two driver eye points, line-of-sight beams pointing to the monitor screen are generated to simulate the visual path when the driver observes the monitor; it is detected whether the obstructing component to be verified intersects with the line-of-sight beam: if the component intersects with a part of the line-of-sight beam, it means that the component obstructs the corresponding area of ​​the monitor, and the obstructed area on the screen is marked.

[0151] S802. Based on the area of ​​the monitor obstructed by the obstructing component to be verified, the score of the direct field of view is obtained according to the preset scoring standard for direct field of view.

[0152] Specifically, the greater the overlap between the area obstructed by the component to be verified and the regulated area on the monitor, the more severe the obstruction of the direct field of view, and the lower the score of the direct field of view.

[0153] The pre-defined scoring criteria for direct field of vision are shown in Table 5:

[0154] Table 5

[0155]

[0156] As shown in Table 5, if the obstruction component to be tested obstructs the regulated area of ​​the monitor, the direct field of view score is 1 point; if the obstruction component to be tested obstructs the regulated area of ​​the monitor but does not obstruct the violation area, the direct field of view score is 2 to 4 points; if the obstruction component to be tested does not obstruct the monitor, the direct field of view score is 1 point.

[0157] The "regulatory area" refers to the area on the monitor screen that must display the "rear view from 60m to infinity" and is specified in GB 15084—2022 "Performance and Installation Requirements of Indirect Vision Devices for Motor Vehicles". This area is the core information area for drivers to judge the safety of lane changing and overtaking.

[0158] The following is combined with Figure 9 This application provides an example of how to obtain a score for whitening of the monitor's liquid crystal area in an embodiment of this application.

[0159] S901. Based on the preset incident light, detect the potential whitening area corresponding to the center point of the human eye ellipse.

[0160] The potential whitening area refers to the region on the monitor's LCD screen where, under preset incident light illumination, the contrast of the displayed content decreases and details become blurred due to diffuse reflection of light (e.g., areas where the local brightness of the screen is more than 50% higher than the normal display brightness). Specifically, the boundaries and extent of the potential whitening area can be identified using optical detection tools (such as a luminance meter) or simulation software.

[0161] S902. Calculate the percentage of the area of ​​the potential whitening region to the area of ​​the monitor's LCD screen to obtain the whitening percentage.

[0162] Specifically, the percentage of white cast = area of ​​potential white cast area / area of ​​monitor LCD screen × 100%.

[0163] S903. Based on the percentage of whitening, obtain a score for the whitening of the monitor's LCD area according to the preset scoring standard for whitening of the monitor's LCD area.

[0164] Specifically, the higher the percentage of whitening, the more severe the whitening of the monitor's LCD area, and the lower the score for whitening of the monitor's LCD area.

[0165] The preset scoring criteria for the whitening of the monitor's LCD screen are shown in Table 6:

[0166] Table 6

[0167]

[0168] As shown in Table 6, if the whitening percentage is greater than 30%, the whitening score of the monitor's LCD area is 1 point; if the whitening percentage is between 10% and 30%, the whitening score of the monitor's LCD area is 2 to 4 points; if the whitening percentage is less than or equal to 10%, the whitening score of the monitor's LCD area is 1 point.

[0169] The above combination Figures 2-9 This document details how the scores for each visual comfort verification item are obtained in the embodiments of this application.

[0170] This application provides a method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, comprising: obtaining the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; calculating the weighted average of the scores of each visual comfort verification item according to the preset weights corresponding to each visual comfort verification item, thereby obtaining the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated; and evaluating the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score. A systematic, objective, and operable visual comfort evaluation system for electronic exterior rearview mirror monitors is constructed, covering all dimensions of issues such as glare, imaging, field of view obstruction, and white cast. By clarifying the evaluation criteria through quantitative indicators and weight allocation, the accuracy and comprehensiveness of the visual comfort evaluation are improved, thereby meeting the needs of driving safety and mass production design.

[0171] Specifically, by clearly defining the visual comfort verification items, the abstract concept of visual comfort is broken down into observable and measurable specific indicators, and objective scoring standards are set for each verification item. This process fundamentally solves the problems of unclear evaluation dimensions and difficulty in comparing results, enabling a unified benchmark for visual comfort evaluation of different vehicle models and design schemes, and achieving a leap from subjective qualitative to objective quantitative assessment.

[0172] Furthermore, by assigning a preset weight to each verification item, the impact of high-risk items is automatically amplified when calculating the overall score using weighted averages. This "weight differentiation" ensures that the overall score is not merely a sum of scores, but a quantitative mapping of safety risks, avoiding the problem of averaged scores masking key defects and making the evaluation results more closely aligned with the safety requirements of actual driving scenarios.

[0173] Example 2:

[0174] The following is combined with Figure 10 This application provides a detailed description of a visual comfort evaluation device for an electronic exterior rearview mirror monitor, as provided in an embodiment.

[0175] like Figure 10As shown in the embodiment of this application, a visual comfort evaluation device for an electronic exterior rearview mirror monitor includes the following modules:

[0176] The acquisition module 1001 is used to acquire the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; wherein, the visual comfort verification items include one or more verification items corresponding to glare, imaging, field of view obstruction and whiteness respectively;

[0177] The calculation module 1002 is used to perform weighted calculation of the score of each visual comfort test item according to the preset weight corresponding to each visual comfort test item, so as to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated.

[0178] Evaluation module 1003 is used to evaluate the visual comfort of the electronic exterior rearview mirror monitor based on an overall visual comfort score.

[0179] In one possible implementation, the acquisition module 1001 includes: a monitor LCD area glare acquisition module, a trim glare acquisition module, a monitor front windshield imaging acquisition module, a monitor LCD screen imaging acquisition module, a direct field of view acquisition module, and a monitor LCD area whitening acquisition module.

[0180] In one possible implementation, the monitor LCD glare acquisition module is used to detect the reflective area corresponding to ten extreme boundary points of the human eye ellipse based on a preset incident light, and take the largest reflective area among the ten extreme boundary points as the target reflective area; calculate the percentage of the target reflective area to the LCD area to obtain the glare percentage; and obtain the monitor LCD glare score based on the glare percentage and a preset monitor LCD glare scoring standard.

[0181] In one possible implementation, the trim dazzling effect acquisition module is used to verify whether a preset incident light ray will be reflected by the trim to the human eye detection point, using any one of the ten extreme boundary points of the human eye ellipse or the center point of the human eye ellipse as the human eye verification point; and to obtain a trim dazzling effect score based on the verification result of whether the preset incident light ray will be reflected by the trim to the human eye detection point.

[0182] In one possible implementation, the monitor imaging acquisition module on the windshield is used to detect the imaging positions of the monitor on the windshield corresponding to the ten extreme boundary points of the human eye ellipse, and take the lowest imaging position among the imaging positions corresponding to the ten extreme boundary points as the target imaging position; based on the target imaging position and the standard-defined windshield area, the monitor imaging score on the windshield is obtained according to the preset scoring standard.

[0183] In one possible implementation, the monitor LCD screen imaging acquisition module is used to detect the imaging areas of the monitor LCD screen corresponding to ten extreme boundary points of the human eye ellipse based on the imaging light source to be verified; wherein, the imaging light source to be verified includes: instrument backlight, button backlight, ambient light, other luminous LCD screens and metal ornaments; the envelope of the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse is taken to obtain the maximum imaging area of ​​the monitor LCD screen; based on the position of the maximum imaging area of ​​the monitor LCD screen on the monitor LCD screen and the percentage of the area of ​​the maximum imaging area of ​​the monitor LCD screen to the area of ​​the monitor LCD screen, a score for the monitor LCD screen imaging is obtained according to a preset monitor LCD screen imaging scoring standard.

[0184] In one possible implementation, the direct field of view acquisition module is used to detect the area of ​​obstruction of the monitor by the obstructing component to be verified, using the driver's eye point as the verification eye point as the standard. The driver's eye point as the standard is defined as two points that are 635mm apart, extending vertically upward from the reference point of the driver's seat and perpendicular to the longitudinal reference plane of the vehicle. Based on the area of ​​obstruction of the monitor by the obstructing component to be verified, a score for the direct field of view is obtained according to a preset scoring standard.

[0185] In one possible implementation, the monitor LCD area whitening acquisition module is used to detect the potential whitening area corresponding to the center point of the human eye ellipse based on a preset incident light; calculate the percentage of the area of ​​the potential whitening area to the area of ​​the monitor LCD screen to obtain the whitening percentage; and obtain a score for the whitening of the monitor LCD area based on the whitening percentage and a preset scoring standard for monitor LCD area whitening.

[0186] In one possible implementation, the evaluation module 1003 is specifically used to determine whether the overall visual comfort score is greater than a preset scoring threshold; when the overall visual comfort score is greater than the preset scoring threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor meets the requirements; when the overall visual comfort score is not greater than the preset scoring threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor does not meet the requirements.

[0187] This application provides a visual comfort evaluation device for an electronic exterior rearview mirror monitor, comprising: an acquisition module 1001 for acquiring the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; a calculation module 1002 for weighted calculation of the scores of each visual comfort verification item according to preset weights corresponding to each visual comfort verification item, to obtain an overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated; and an evaluation module 1003 for evaluating the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score. A systematic, objective, and operable visual comfort evaluation system for electronic exterior rearview mirror monitors is constructed, covering all dimensions of problems such as glare, imaging, field of view obstruction, and white cast. By clarifying the evaluation criteria through quantitative indicators and weight allocation, the accuracy and comprehensiveness of visual comfort evaluation are improved, thereby meeting the needs of driving safety and mass production design.

[0188] It should be noted that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, for the device embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can be referred to the description of the method embodiments. The device embodiments described above are merely illustrative, and the units described as separate components may or may not be physically separate. The components indicated as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment solution according to actual needs. Those skilled in the art can understand and implement this without creative effort.

[0189] The above description is merely one specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for evaluating the visual comfort of an electronic exterior rearview mirror monitor, characterized in that, include: Obtain the score for each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; wherein, the visual comfort verification item includes one or more verification items corresponding to glare, imaging, field of view obstruction and whiteness respectively; the score for each visual comfort verification is obtained based on the corresponding scoring criteria. According to the preset weights corresponding to each visual comfort test item, the scores of each visual comfort test item are weighted and calculated to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated. The visual comfort of the electronic exterior rearview mirror monitor is evaluated based on the overall visual comfort score. The verification items corresponding to the glare include: glare on the monitor's LCD area and glare on the trim strip; the verification items corresponding to the imaging include: imaging of the monitor on the windshield and imaging of the monitor's LCD screen; the verification items corresponding to the field of view obstruction include: direct field of view; the verification items corresponding to the whitening include: whitening of the monitor's LCD area. The score for the brilliance of the monitor's LCD screen is obtained through the following method: Based on the preset incident light, the reflective area corresponding to the ten extreme boundary points of the human eye ellipse is detected, and the largest reflective area among the ten extreme boundary points is taken as the target reflective area. The glare percentage is obtained by calculating the percentage of the reflective area of ​​the target relative to the area of ​​the liquid crystal region; Based on the glare percentage, the glare score of the monitor's LCD area is obtained according to the preset glare scoring standard for the monitor's LCD area; The monitor's score for the windshield imaging is obtained in the following manner: The monitor's imaging position on the windshield corresponds to the ten extreme boundary points of the human eye ellipse, and the lowest imaging position among the imaging positions corresponding to the ten extreme boundary points is taken as the target imaging position. Based on the target imaging position and the standard-defined windshield area, the score of the monitor's imaging in the windshield is obtained according to the preset scoring criteria for the monitor's imaging in the windshield. The score for the whitening of the monitor's liquid crystal area was obtained in the following way: Based on the preset incident light, detect the potential whitening area corresponding to the center point of the human eye ellipse; Calculate the percentage of the area of ​​the potential whitening region relative to the area of ​​the monitor's LCD screen to obtain the whitening percentage; Based on the percentage of whitening, a score for the whitening of the monitor's liquid crystal area is obtained according to a preset scoring standard for whitening of the monitor's liquid crystal area.

2. The method according to claim 1, characterized in that, The dazzling score of the trim was obtained in the following way: Using any one of the ten extreme boundary points of the human eye ellipse or the center point of the human eye ellipse as the human eye verification point, verify whether the preset incident light will be reflected to the human eye verification point through the decorative strip. Based on the test results of whether the incident light will be reflected by the trim to the human eye test point, the dazzling score of the trim is obtained.

3. The method according to claim 1, characterized in that, The score of the monitor's LCD screen image is obtained in the following way: Based on the imaging light source to be verified, the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse are detected; wherein, the imaging light source to be verified includes: instrument backlight, button backlight, ambient light, other light-emitting LCD screens and metal ornaments. The maximum imaging area of ​​the monitor LCD screen is obtained by taking the envelope of the imaging areas of the monitor LCD screen corresponding to the ten extreme boundary points of the human eye ellipse. Based on the location of the maximum imaging area of ​​the monitor LCD screen on the monitor LCD screen and the percentage of the area of ​​the maximum imaging area of ​​the monitor LCD screen to the area of ​​the monitor LCD screen, a score for the monitor LCD screen imaging is obtained according to a preset scoring standard for the monitor LCD screen imaging.

4. The method according to claim 1, characterized in that, The direct field of view score is obtained in the following manner: Using the driver's eye point specified in the standard as the verification eye point, the area obstructed by the obstructing component to be verified on the monitor is detected; wherein, the driver's eye point specified in the standard is: two points that are 635mm vertically extended upward from the reference point of the driver's seat, and perpendicular to the longitudinal reference plane of the vehicle and 65mm apart. Based on the area of ​​the monitor obstructed by the obstructing component to be verified, the score of the direct field of view is obtained according to the preset scoring standard for the direct field of view.

5. The method according to claim 1, characterized in that, The evaluation of the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score includes: Determine whether the overall visual comfort score is greater than a preset score threshold; When the overall visual comfort score is greater than the preset score threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor meets the requirements. If the overall visual comfort score is not greater than a preset score threshold, it is determined that the visual comfort of the electronic exterior rearview mirror monitor does not meet the requirements.

6. A visual comfort evaluation device for an electronic exterior rearview mirror monitor, characterized in that, include: The acquisition module is used to acquire the score of each visual comfort verification item of the electronic exterior rearview mirror monitor to be evaluated; wherein, the visual comfort verification items include one or more verification items corresponding to glare, imaging, field of view obstruction, and whitening respectively; the verification items corresponding to glare include: glare of the monitor LCD area and glare of the trim strip; the verification items corresponding to imaging include: imaging of the monitor on the windshield and imaging of the monitor LCD screen; the verification items corresponding to field of view obstruction include: direct field of view; the verification items corresponding to whitening include: whitening of the monitor LCD area; The calculation module is used to perform weighted calculation on the score of each visual comfort test item according to the preset weight corresponding to each visual comfort test item, so as to obtain the overall visual comfort score of the electronic exterior rearview mirror monitor to be evaluated. The evaluation module is used to evaluate the visual comfort of the electronic exterior rearview mirror monitor based on the overall visual comfort score. The acquisition module specifically includes: a monitor LCD area glare acquisition module, a trim glare acquisition module, a monitor image acquisition module for the front windshield, a monitor LCD screen image acquisition module, a direct field of view acquisition module, and a monitor LCD area whitening acquisition module. The monitor LCD glare acquisition module is used for: Based on the preset incident light, the reflective area corresponding to the ten extreme boundary points of the human eye ellipse is detected, and the largest reflective area among the ten extreme boundary points is taken as the target reflective area. The glare percentage is obtained by calculating the percentage of the reflective area of ​​the target relative to the area of ​​the liquid crystal region; Based on the glare percentage, the glare score of the monitor's LCD area is obtained according to the preset glare scoring standard for the monitor's LCD area; The monitor, in the windshield imaging acquisition module, is used for: The monitor's imaging position on the windshield corresponds to the ten extreme boundary points of the human eye ellipse, and the lowest imaging position among the imaging positions corresponding to the ten extreme boundary points is taken as the target imaging position. Based on the target imaging position and the standard-defined windshield area, the score of the monitor's imaging in the windshield is obtained according to the preset scoring criteria for the monitor's imaging in the windshield. The monitor LCD area whitening acquisition module is used for: Based on the preset incident light, detect the potential whitening area corresponding to the center point of the human eye ellipse; Calculate the percentage of the area of ​​the potential whitening region relative to the area of ​​the monitor's LCD screen to obtain the whitening percentage; Based on the percentage of whitening, a score for the whitening of the monitor's liquid crystal area is obtained according to a preset scoring standard for whitening of the monitor's liquid crystal area.

Images