Question

I have made one function in which I am passing a matrix and returning processed matrix, but the data of processed matrix is getting copied into the matrix which I passed, for ex.

    output=processMatrix(srcCopy);

then when I show both of these matrix, I get same image in srcCopy and output also, I am allocating them memory as;

    output=Mat(image.rows,image.cols,CV_8UC1 );
    srcCopy=Mat(image.rows,image.cols,CV_8UC1 );

Answer 1

The problem is that the cv::Mat copy constructor does a shallow copy of the source cv::Mat. See here. What you probably need to do is use the cv::MAt::clone() method to create a clone of the original. Then, you can avoid the shallow copy in the function parameter list:

cv::Mat skeletonize(const cv::Mat& m) { 
  // use clone() in here to make a new Mat and return it
}