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Thread Subject:
Scale value in automatic threshold at edge function (sobel, roberts.. method)

Subject: Scale value in automatic threshold at edge function (sobel, roberts.. method)

From: Fábio

Date: 26 Aug, 2013 23:34:13

Message: 1 of 1

 I looked at edge function source code and I notice that automatic threshold is based in image SNR (for methods like sobel, roberts, etc ), but what I didn´t understand was the scale value used. For sobel it uses scale=4, for Roberts scale=6, but , based on what assumptions or theory this numbers were found? Magically, this automatic threshold, seems to work very well, for me at least..

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