What is the difference between a Line and an Edge in image detection?

Question

We have been learning about methods like Sobel and Roberts\' convolution matrices to detect edges within images, extending to the Canny method to clear them up. But now, we

Answer 1

Edge detection is the process of finding outlines in an image, whatever they look like.

Line detection finds line segments (sometimes by extension, other geometric figures such as circular arcs).