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help needed in image segmentation.

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mohammed
mohammed 2013-11-4
关闭： MATLAB Answer Bot 2021-8-20
Hallo
After segmentation with 5 cluster i got this image. but it giving me more then 5 region . i want to keep the 5 largest region of each color and if there any smallest region it would take the color of that region.
please help me...............

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Image Analyst
Image Analyst 2013-11-4
See my demo, attached below. The code will let you extract the N largest or smallest blobs. However deciding which label to assign to the small blobs that get merged is not so straightforward, particularly when they may have 2 or more neighbors with different labels. For example, that olive green blob in the upper middle borders orange, brown, magenta, and green blobs. So which color should it take on?
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mohammed
mohammed 2013-11-14
still not able to solve the way u show me . plz help me..
Image Analyst
Image Analyst 2013-11-14
Here's the code simplified to pull out exactly the 5 largest blobs:
% Get all the blob properties.
[labeledImage, numberOfBlobs] = bwlabel(binaryImage);
blobMeasurements = regionprops(labeledImage, 'area');
% Get all the areas
allAreas = [blobMeasurements.Area];
numberToExtract = 5;
% Sort in order of largest to smallest.
[sortedAreas, sortIndexes] = sort(allAreas, 'descend');
% Extract the "numberToExtract" largest blobs using ismember().
biggestBlob = ismember(labeledImage, sortIndexes(1:numberToExtract));
% Convert from integer labeled image into binary (logical) image.
binaryImage = biggestBlob > 0;

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