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calib_cn.md 标定采样问题 #44

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@ljl86092297

我使用您calib_cn.md 文档中的操作流程,我色块采样的时候是用了同样大小的框在图像中局部采样如下所示,但在计算K与var的时候发现,在iso较低时(100-400)k与var并不成线性关系,请问这是正常的现象吗?那如果不成线性关系我该如何继续后续的步骤?还是说只要用一条直线拟合大部分的点就可?不一定需要他们呈线性关系?
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