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        <title>yanding:成像质量评价:工具:图卡:18_灰</title>
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        <description>18%灰

一、什么是18%灰

18 %灰是指光线反射率为 18%的中性灰色，常用于曝光校准（如使用灰卡）和色彩管理（如自定义白平衡、后期调色基准）。


常见的标准灰卡（一面18%灰、一面90%白），其18%、90%数值均指</description>
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        <dc:date>2025-10-31T07:20:23+00:00</dc:date>
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        <title>yanding:成像质量评价:工具:图卡:图卡材质选择指南</title>
        <link>https://wiki.yanding.com/doku.php?id=yanding:%E6%88%90%E5%83%8F%E8%B4%A8%E9%87%8F%E8%AF%84%E4%BB%B7:%E5%B7%A5%E5%85%B7:%E5%9B%BE%E5%8D%A1:%E5%9B%BE%E5%8D%A1%E6%9D%90%E8%B4%A8%E9%80%89%E6%8B%A9%E6%8C%87%E5%8D%97&amp;rev=1761895223&amp;do=diff</link>
        <description>图卡材质选择指南

图卡是光学检测、成像系统测试等领域的核心工具，其材质直接影响测试精度、使用寿命与适用场景。合理选择图卡材质，需结合测试模式（反射/透射）、分辨率要求、环境适应性等需求，对各类材质的优缺点进行全面分析。</description>
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        <title>yanding:成像质量评价:工具:图卡:图卡的使用_维护和储存指南</title>
        <link>https://wiki.yanding.com/doku.php?id=yanding:%E6%88%90%E5%83%8F%E8%B4%A8%E9%87%8F%E8%AF%84%E4%BB%B7:%E5%B7%A5%E5%85%B7:%E5%9B%BE%E5%8D%A1:%E5%9B%BE%E5%8D%A1%E7%9A%84%E4%BD%BF%E7%94%A8_%E7%BB%B4%E6%8A%A4%E5%92%8C%E5%82%A8%E5%AD%98%E6%8C%87%E5%8D%97&amp;rev=1762509982&amp;do=diff</link>
        <description>图卡的使用、维护和储存指南

测试图卡是影像质量评估中不可或缺的基准工具，其自身的完好性直接决定了测试结果的准确性。不当的使用和储存环境会导致图卡褪色、划伤或变形，从而使其失去标定价值。</description>
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        <title>yanding:成像质量评价:工具:图卡:如何选择合适图卡</title>
        <link>https://wiki.yanding.com/doku.php?id=yanding:%E6%88%90%E5%83%8F%E8%B4%A8%E9%87%8F%E8%AF%84%E4%BB%B7:%E5%B7%A5%E5%85%B7:%E5%9B%BE%E5%8D%A1:%E5%A6%82%E4%BD%95%E9%80%89%E6%8B%A9%E5%90%88%E9%80%82%E5%9B%BE%E5%8D%A1&amp;rev=1768876446&amp;do=diff</link>
        <description>如何选择合适图卡？

在图像质量评估（如摄像头、显示设备、激光雷达等）中，测试图卡是标准化、可复现的核心工具 —— 它能将 “主观视觉感受” 转化为 “客观数据指标”。本文将从基础概念出发，拆解图卡的用途、参数与选型逻辑、图卡材质与装裱、图卡的使用与存储，帮助你精准匹配测试需求以及正确使用图卡。$tan\frac{DFOV}{2}=\frac{D /2}{S}$$D=2S\frac{DFOV}{2}$$OD = \log_{10}\left( \frac{I_{0}}{I} \right)$$实际最小物理精度（微米）=\frac{25400}{DPI}$…</description>
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