Why closed contours are guaranteed here?

Posted by user198729 on Stack Overflow See other posts from Stack Overflow or by user198729
Published on 2010-04-19T06:17:52Z Indexed on 2010/04/19 6:23 UTC
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BW = edge(I,'zerocross',thresh,h) specifies the zero-cross method, using the filter h. thresh is the sensitivity threshold; if the argument is empty ([]), edge chooses the sensitivity threshold automatically. If you specify a threshold of 0, the output image has closed contours, because it includes all the zero crossings in the input image.

I don't understand it,can someone elaborate?

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Developer IT

Why closed contours are guaranteed here? - Developer IT

Why closed contours are guaranteed here?

matlab

image-processing

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