C++ 如何计算和使用 cvMat 平均值
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how to calculate and use cvMat mean value
提问by EyalG
In the openCV cheat sheet (C++), I have found the matrix opration mean(). When I use it:
在 openCV 备忘单（C++）中，我找到了矩阵 opration mean()。当我使用它时：
float myMatMean = mean( MyMat );
I get the error:
我收到错误：
no suitable conversion function from "cv::Scalar" to "float" exists
不存在从“cv::Scalar”到“float”的合适转换函数
What can I do in order to use this data?
我该怎么做才能使用这些数据？
回答by EyalG
Thanks.
谢谢。
The problem was that although myMatwas a 2D image. The return type was still a Scalarof size 4.
问题是虽然myMat是 2D 图像。返回类型仍然是Scalar大小为4 的 a。
The solution was
解决办法是
cv:Scalar tempVal = mean( myMat );
float myMAtMean = tempVal.val[0];
