how to calculate the area of different labels and remove the labels with smaller area??

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i labeled an image using CC = bwconncomp(BW).how to find area of different labels?? and how do i remove labels with smaller area???

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Answer 1

Michael Haderlein 2015-4-2

编辑：Michael Haderlein 2015-4-2

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CC is a struct including the field PixelIdxList. If you define the area as number of pixels, you just need the number of elements of each cell:

elemsize=cellfun(@numel,CC.PixelIdxList);

To remove the small ones (I define "small" as "less than 100 pixels"):

 BW2=BW;
 BW2(vertcat((CC.PixelIdxList{cellfun(@numel,CC.PixelIdxList)<100})))=0;

You can of course do this without copying BW (just ignore the first line and use BW instead of BW2 in the second line).

Edit: If you also want to remove these from CC:

 CC.PixelIdxList(cellfun(@numel,CC.PixelIdxList)<100)=[];
 CC.NumObjects=numel(CC.PixelIdxList);

santosh patil 2015-4-3

thank you Michael Haderlein.

Answer 2

Image Analyst 2015-4-3

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This is what's done in my Image Processing Tutorial, attached.