removing area

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

Answer 1

[Andrei Bobrov]

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

Answer 2

[Image Analyst]

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.

[Andrei Bobrov]

+1

Answer 3

[Sean de Wolski]

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.