Is there a way to direct an algorithm in edge detection, or correct my drawing outline of the edge?

Muser10101010

2015 6 24

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I have some images that are difficult to detect the edges but I only need some simple selections done. I have written something that I can use ginput to outline the edge I wish to make but looking if there is any way to correct it using an edge detection, kind of line snapping a line to a grid?

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David Young 2015-6-24

编辑：David Young 2015-6-24

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This is exactly what active contours, or snakes, were originally designed for. If you have the Image Processing Toolbox, have a look at activecontour.