FIXME **This page is not fully translated, yet. Please help completing the translation.**\\ 
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==== CMS Glare ====
**CMS glare** refers to the optical interference phenomenon in a [[yanding:成像质量评价:测试用例:cms测试用例:cms|Camera Monitor System (CMS)]] during driving scenarios, where strong direct or reflected light causes multiple unintended reflections and scattering on the lens surfaces and inside the lens barrel, resulting in an overall decrease in image contrast and the appearance of large bright spots. Regulatory standards set clear requirements for this to ensure that the vehicular CMS can still clearly recognize road conditions and effectively avoid driving safety risks under strong light conditions such as backlighting or oncoming headlights.\\
|  {{ :yanding:成像质量评价:测试用例:cms测试用例:partial_eclipse_visible_in_lens_flare_in_caen_2025-03-29.jpg?580 |}}  |  {{ :yanding:成像质量评价:测试用例:cms测试用例:07_driving_in_fog_-_car_in_low_visibility_dangerous_weather_conditions.jpg |}}  |{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光场景1.png?620 |}}   |

(Image source: https://commons.wikimedia.org/wiki/File:Partial_eclipse_visible_in_lens_flare_in_Caen_2025-03-29.jpg)\\
(Image source: https://commons.wikimedia.org/wiki/File:07_Driving_in_fog_-_car_in_low_visibility_dangerous_weather_conditions.jpg)\\


**Regulatory Standard Requirements:** (GB 15084 4.3.2.8)\\
The area of halos and lens glare shall not exceed 25% of the displayed image area.\\


**Test Method:**\\
**Environment Setup:**\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:亮度对比度复现1.png|}}
The following equipment will be used in the test: (1) test chart, (4) high-brightness glare point light source, (5) camera under test, (7) monitor, (8) imaging luminance meter.\\

**Environment Parameter Settings:**\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光环境2.png |}}

**Position Reference for Camera and Glare Light Source:**\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光环境摆放参考2.png?600|}}
Using a black chart as the background, move the camera so that the glare point light source presents an angular subtense of 30-34 arcmin relative to the camera. Rotate the camera to determine the angle at which the glare is maximized.\\
**Recommended Equipment:**\\
[[https://yanding.com/product/detail?id=1563|Automated Chart Switching Bracket Test System]], [[https://yanding.com/product/detail?id=1740|Glare Fiber Optic Point Light Source]], [[https://yanding.com/product/detail?id=1619|3% Reflectance Test Chart]], [[https://rdbuy.com/product/productdetail?model_id=1051&goods_sku_id=6191|2D Imaging Luminance Meter]], [[https://yanding.com/product/detail?id=1750|RIQA-CMS Image Quality Analysis Software]], [[https://yanding.com/product/detail?id=1731|Monitor and Luminance Meter Moving Bracket]]
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光设备2.png |}}

**Operation Steps:**\\
Camera side:
  1. Switch the chart to the black chart;
  2. Adjust the camera so that its optical axis is perpendicular to the chart;                                                       
  3. Adjust the distance between the point light source and the camera so that the angular subtense of the light source relative to the camera is 30-34 arcmin;
  4. Turn on the glare point light source and adjust its brightness so that the luminance of the glare point light source is 5M-10M cd/m²;
  5. Adjust the angle between the light source and the camera's optical axis, and observe the monitor screen until the maximum camera artifacts appear.
Monitor side:
  1. Adjust the monitor and the reference lens of the imaging luminance meter so that the tilt angle of the reference lens relative to the monitor equals the designed viewing tilt angle of the monitor, Θmonitor/D;
  2. Turn off other light sources so that the ambient illuminance on the monitor side is below 10 lx;              
  3. Use the imaging luminance meter to capture the test image.
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光拍摄场景2.png?350|}}

**Software Analysis and Result Interpretation:**\\
Use [[https://yanding.com/product/detail?id=1894|RIQA Software]] (an image quality software independently developed by Yanding) to analyze the test images.\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光riqa.png?|}}

After analysis, the RIQA software will output data results for the glare area ratio and the total pixels in the glare region. The glare region refers to the imaging area within the monitor screen where the luminance of the glare signal is greater than half of the maximum glare-induced luminance; the glare area ratio is the percentage of this region relative to the entire monitor screen.\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:眩光面积.png?600 |}}
Taking the data in the above figure as an example, its glare area ratio is less than the 25% required by the regulatory standard. Therefore, the sample has been tested and verified to meet the requirements.