Cannot Access Mean Values

Question

I have computed mean and standart deviation values of a region in the image. The code:

Mat img=imread(\"a.jpg\");
Mat hsv1;
Mat mean, stdev;
cvtColor(img, hsv1,         


        

Answer 1

The problem here is that you're trying to access a CV_64F Mat using at<float>.

You can solve this like:

double Mi = mean.at<double>(0,0);

Or declaring Scalar instead of Mat:

Scalar mean, stdev;
cv::meanStdDev(hsv1, mean, stdev, superpixel_mask);
double Mi = mean[0];