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how can I remove small objects from binary image?

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nadia
nadia 2016-10-25
评论： Image Analyst 2019-10-18
I have a binary Image that is attached hear.my problem is small objects that are on the right side of image. how can I delete them such that the external border of breast(second border) is preserved and fill the breast ROI?thanks

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Image Analyst
Image Analyst 2016-10-25
Well there are lots of ways. One is to try bwareafilt() and tell it a size range you want to extract. Another way is to try bwareaopen(). Another way might be to use regionprops and throw out blobs based on their x centroid location. Another way might be to scan down line by line, finding the first non-zero pixel, then moving over about 10 pixels and then erasing to the right of that. You might even combine some of them if one method does not get them all.
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Torkan
Torkan 2019-10-18
Hi analyst,
Now, that we use the last line how can we create new image without those objects?
Image Analyst
Image Analyst 2019-10-18
If youi wanted to remove them instead of keep them just set the labeled image to zero there and re-measure your properties:
% Use ismember to get those out into a new image
blobsToExclude = ismember(labeledImage, indexes); % These are blobs we don't want.
% Erase those blobs from our original binary image.
binaryImage(blobsToExclude) = false;
% Re-measure what's left.
labeledImage = bwlabel(binaryImage);
props = regionprops(labeledImage, 'Centroid', 'Area');

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