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==== CMS Depth of Field ====
**Definition:**\\
**CMS depth of field** refers to the distance range over which the imaging resolution of a [[yanding:成像质量评价:测试用例:cms测试用例:cms|Camera Monitor System]] meets the thresholds of automotive regulations and ensures that the driver can clearly identify objects behind the vehicle at various object distances. Unlike photographic depth of field, it primarily quantifies and determines the stability of imaging resolution at different distances within the depth of field using MTF10, rather than merely focusing on the size of the sharp region.\\

**Metrics:**\\
The CMS shall enable the driver to observe the object space and have sufficient resolution to perceive the displayed content within the relevant range to identify details.\\
When the test distance is **10 meters** (representing infinity) or **6 meters** (intermediate distance), the CMS resolution must satisfy:\\
$$MTF10_{(1:1)} \geq 0,9^*MTF10_{MIN(1:1)} \left[ \text{LW/PH} \right]\tag{1}$$

When the test distance is **4 meters** (close distance), the CMS resolution must satisfy:\\
$$MTF10_{(1:1)} \geq \frac{1}{2} MTF10_{MIN(1:1)} \left[ \text{LW/PH} \right]]\tag{2}$$

**Test Method:**\\
**Environment Setup:**\\
{{ :yanding:成像质量评价:标准化测试:cms景深环境2.png?700|}}
**Actual Scene:**\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:景深实际场景.png?460|}}
**Camera side:** Light source color temperature 6500K±1500K, illuminance 800±80 lx;\\
**Monitor side:** Dark environment with 0-10 lx.\\

**Main Equipment Used:**\\
[[https://yanding.com/product/detail?id=1563|Automated Chart Switching Bracket Test System]], [[https://yanding.com/product/detail?id=1534|Multi-CCT LED Fill Light Source (Visible and NIR)]], [[https://yanding.com/product/detail?id=1611|Color Reproduction 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|Mobile Bracket for Monitor and Luminance Meter]]
{{ :yanding:成像质量评价:测试用例:cms测试用例:景深7.png |}}

**Operation Procedure:**\\
**Camera side:**\\
  1. Switch the chart to the depth of field chart;
  2. Turn on the fill light source, adjust the light brightness, and set the color temperature to 6500K;  
  3. Adjust the camera so that its optical axis is perpendicular to the chart and the chart is centered in the image; the camera can be adjusted to capture resolution in different directions;
  4. Adjust the distance between the camera and the chart, and capture images at 4m, 6m, and 10m respectively;
  (For wide-angle mirrors replacing a radius of curvature r≤400mm, the measurement at 10m can be omitted; if the focal length is less than 6m, the distance d from the camera entrance pupil to the chart should be less than or equal to 6m);
**Monitor side:**
  1. The capture lens of the imaging luminance meter is perpendicular to the monitor;
  2. Turn off other light sources to ensure the ambient luminance on the monitor side is below 10 lx;
  3. Capture images using the 2D imaging luminance meter.

**Analysis and Interpretation:**\\
Use [[https://yanding.com/product/detail?id=1894|RIQA Software]] (an image quality software independently developed by Yanding) to analyze the test samples.\\
{{ :yanding:成像质量评价:测试用例:cms测试用例:riqa景深.png |}}
{{:yanding:成像质量评价:测试用例:cms测试用例:景深结果.png?1000|}}
The depth of field results require determining whether the $MTF10$ meets regulatory requirements. MTF10 (P*K) is calculated based on the visually determined position of blurred line pairs (P value) combined with the coefficient K. As long as this value meets the standard, the sample complies with regulatory requirements.