Question

I was if there any function in OpenCV, that call tell me the X and Y position of the max or the mean value of my Ycbcr frame . I’ve already done the conversion from RGB and I can find the max and the min but that with for loop that take me just too much memory

thanks in advance

Answer 1

The minMaxLoc function should help you to do that.

Update: For example:

Mat src = imread("image.jpg"), tmp;
cvtColor(src, tmp, CV_BGR2YCrCb);

//extract Y
extractChannel(tmp, tmp, 0);

Point min, max;
double minV, maxV;
minMaxLoc(tmp, &minV, &maxV, &min, &max);

cout << "Max value is " << maxV << " at position " << max << endl
     << "Min value is " << minV << " at position " << min << endl;

The output:

Max value is 255 at position [52, 19]
Min value is 0 at position [28, 1]