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测试灰度图在Mask下，三种均值统计方法，结果一样

灰度图 tempGray

二值Mask tempROIBinary

方法一：

//用meanStdDev求均值

Mat MeanMat,StddevMat;

meanStdDev(tempGray,MeanMat,StddevMat,tempROIBinary);

double dtempMean = MeanMat.at(0, 0);

double dtempStd = StddevMat.at(0, 0);

方法二：

//用mean求均值

Scalar fScalarMean = mean(tempGray,tempROIBinary);

dtempMean = fScalarMean [0];

方法三：

//自己算均值

tempGray = tempROIBinary.mul(tempGray )/255;

Scalar fScalarSum = sum(tempGray);

dtempMean = fScalarSum[0]/countNonZero(tempGray);