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I could find contours of an object in an image by using findContours.

and by using this I could crop the object contours.

Dist.copyTo(crop, mask);

now, I need to find the index of crop Image in Dist image.

to do that I converted the Mat into the float to pointer and I called it cropped!

and then I tried this:

for(int j=0; j < (Dist.rows * Dist.cols); j++){
            if(cropped[j] != 0 ){
                row = (j / width) + ((Dist.rows));
        col = (j % width) + (Dist.cols);

            }
            Index.push_back(std::make_pair(row,col));
            }

But it does not give me any correct answer...