How to detected isolated/closed contours?

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Upupaepops
Upupaepops 2014-4-24
回答： Image Analyst 2014-4-24
Hello. I'd like to know if there are any functions that I can use to detect detached and isolated closed contour lines. I've obtained the contour lines by using:
[C,h] = contourf(...)
But C gives location of points in contours of the same value, and I find it hard to sort out those which forms a close loop and those spread over the space domain. I wonder if there're any algorithms to detect closed contour / detached filament like those in the following image? (I use arrows to indicate some filaments of interest)
Thanks for any kind help.

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回答（1 个）

Image Analyst
Image Analyst 2014-4-24
I think you should be able to use imregionalmax and imregionalmin in the Image Processing Toolbox.
Or, maybe try this: http://www.mathworks.com/matlabcentral/fileexchange/35452-finddepressions

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