如何计算和使用cvMat平均值 [英] how to calculate and use cvMat mean value

问题描述

在openCV备忘单(C ++)中，我发现矩阵运算符mean().当我使用它时:

In the openCV cheat sheet (C++), I have found the matrix opration mean(). When I use it:

float myMatMean = mean( MyMat );

我得到了错误:

从"cv :: Scalar"到"float"的转换功能不存在

no suitable conversion function from "cv::Scalar" to "float" exists

我该怎么做才能使用这些数据?

What can I do in order to use this data?

推荐答案

谢谢.

问题在于尽管myMat是2D图像.返回类型仍然是大小为 4 的Scalar.

The problem was that although myMat was a 2D image. The return type was still a Scalar of size 4.

解决方案是

cv:Scalar tempVal = mean( myMat );
float myMAtMean = tempVal.val[0];

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