Sobel operator for gradient angle

Question

I want to find the direction of impact in the text. How to use the Sobel operator for this purpose?

This image shows dp., Which is the direction of the gradient. I wanted to know how I can apply the Sobel operator to search for a pixel to select (p to q) along the path to find the other end of the q pixel in the edge.

Answer 1

You can find x image distortion, then y derivative.

Sobel(Img,gxx,CV_32FC1,1,0); //  x derivative
Sobel(Img,gyy,CV_32FC1,0,1); //  y derivative

After this search phase, http://docs.opencv.org/modules/core/doc/operations_on_arrays.html#phase

phase(gxx,gyy,angles,inDegrees);