how can I obtain Boundary of an image with morphological operators?

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sara
sara 2014-9-5
编辑： Image Analyst 2014-9-6
how can I obtain Boundary of an image with morphological operators? for example my image is A...I want to obtain Boundary and fill Within the image. thanks
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sara
sara 2014-9-5
ok thanks Image Analyst and Matt
if I want to fill my image I should use an other input arguments for imerode...do you know what I can use?

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Image Analyst
Image Analyst 2014-9-5
I agree with Matt J. If you want an image you could also use bwperim(). To do it morphologically you'd call imerode() to shrink the blobs out one layer, then subtract that from the original
perimImage = binaryImage - imerode(binaryImage);
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sara
sara 2014-9-5
Sure Image Analyst but when I want to run imfill it wants to select some points and Because of this my result has a little Differences.but I ask a new question for this and hope that you help me.
Image Analyst
Image Analyst 2014-9-5
No it doesn't. I do it all the time. Just do this:
filledImage = imfill(binaryImage, 'holes');
Again, I do it all the time so I know for a fact that it works.

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更多回答（1 个）

Matt J
Matt J 2014-9-5
编辑：Matt J 2014-9-5
You can use bwboudaries to find the boundaries, but if you're just going to end up filling them, you could probably just use imfill.

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