removing area

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Mohammad Golam Kibria
Mohammad Golam Kibria on 7 Jul 2011
I have a code like this.
CC = bwconncomp(I2);
STATS = regionprops(CC,'Area');
idx = find([STATS.Area] <100);
I2(idx)=0;
figure,imshow(I2)
the objective of this code is to set zero value to those pixel whose area is less than 100.
I am not sure whether it is working properly. But perhaps Its not the correct way to achieve may objective.
can any one help how to do that? Thanks

Accepted Answer

Andrei Bobrov
Andrei Bobrov on 7 Jul 2011
STATS = regionprops(CC,'PixelIdxList','Area');
I2(cell2mat(cellfun(@(x)x',{STATS([STATS.Area]<100).PixelIdxList},'un',0)))=0;

More Answers (2)

Image Analyst
Image Analyst on 10 Jul 2011
Or you can just call bwareaopen with an argument of 100 before you even call bwconncomp at all.
I2 = bwareaopen(binaryImage, 100);
Then call bwconncomp on I2.

Sean de Wolski
Sean de Wolski on 7 Jul 2011
You don't even need regionprops!
CC = bwconncomp(I2);
idxkeep = cellfun('prodofsize',CC.PixelIdxList)>=100;
Ibigstuff = false(CC.ImageSize); %new image
Ibigstuff([CC.PixelIdxList{idxkeep}]) = true; %keep only good parts
regionprops doesn't actually contain the data in the region, CC does, so in order to manipulate regions you need CC.

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