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Sobel filter with slider (GUI).

Asked by Maria Lopez on 11 Jun 2013
Hello, So, I am trying to use a slider to manipulate the sobel filter to modify an image. The problem is I have no clue how sobel works whatsoever. I am pretty much still new to matlab, but I would appreciate if someone can at least explain how sobel works. Thank you.

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2 Answers

Answer by Amith Kamath on 19 Aug 2013
Edited by Amith Kamath on 19 Aug 2013

http://homepages.inf.ed.ac.uk/rbf/HIPR2/sobel.htm is a good introduction to the Sobel filter. It is essentially a Laplacian of Gaussian (LOG) filter which detects edges in your input image. http://www.mathworks.com/help/images/analyzing-images.html#f11-12512 may also help.

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Answer by Image Analyst
on 19 Aug 2013

The standard Sobel filter is done by the imgradient() function. That's a 3-by-3 filter. If you want to modify it, then you can choose a different size filter by using a LOG or DOG filter and conv2() or imfilter().

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