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Generate contours from image

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Hi,

I want to generate contours from image based on several values (tressholds in A, B, C....). So far, I am using Marching Squares, which works fine. Now for the problem. If I use MATLAB "contourc" function, I got far better results. My main problem is with duplicite contours.
Is there any better and still easy to implement algorithm besides Marching Squares ? And If anonyo knew, what MATLAB is using...

Thanks

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I don't know much about this, but there's a link at the bottom of [url="http://www.mathworks.com/help/matlab/ref/contourc.html"]countorc[/url]'s documentation to [url="http://www.mathworks.com/help/matlab/creating_plots/contour-plots.html#f10-2614"]The Contouring Algorithm[/url], which may interest you.

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