I am marking the edge points on an image. The size is large, and hence marking the correct edge is difficult on my screen. I use 'getpts' to mark points. I want to do the following: 1. Mark the points in first iteration approximately. 2. Move the marked points closer to the correct position in second run because if I were to zoom in, marking will be difficult even though the edges are clear.
Till now it has been trial and error method. Is there a better way?
