remove wanted portions in binary image
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Elysi Cochin
il 30 Nov 2013
Commentato: Elysi Cochin
il 2 Dic 2013
i wanted to extract only the white portion from the image
i get more than one region... i should get only one region.... please do reply.....
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Image Analyst
il 30 Nov 2013
There is a function for removing blobs smaller than a specified size. It's called bwareaopen():
cleanedBinaryImage = bwareaopen(binaryImage, 40); % Remove blobs smaller than 40.
Alternatively you can use a function I wrote to keep, or eliminate, the N largest, or smallest (whichever you specify), blobs. See attached demo in blue text below. This is more general and flexible than bwareaopen, but more complicated.
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Jeremy Wurbs
il 30 Nov 2013
If you wish to remove small regions from the binary image itself, you could start by looking at morphological operations ( help bwmorph), specifically erode and dilate.
You could also just remove the small regions from your bounding box list, or just take the largest one. I.e. only take bounding boxes where boundingBox(3)*boundingBox(4) >= minSize.
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