I want to measure the size of the welding. The image of welding is attached below. At first I need to extract the edge of the object. I got some problem!
I have tried a lot of algorithms to extract the edge, but it is hard to get the inner edge of the welding, because the image is noisy and the boundary is blurry.
the image below is the ideal contour I want to get.
Could someone tell how can I get it?