MATLAB: Doubt regarding bwconncomp example.

Question

This is a small doubt…..I'm stuck in the second example given for bwconncomp by Mathworks. This example removes the group of pixels having largest pixels connected (in an 8 connected neighbourhood):

BW = imread('text.png');
imshow(BW);
CC = bwconncomp(BW);
numPixels = cellfun(@numel,CC.PixelIdxList);
[biggest,idx] = max(numPixels);
BW(CC.PixelIdxList{idx}) = 0;
figure, imshow(BW);

I want to change the code to erase groups of pixels which have between 20 to 70 connected pixels (in their 8 connected neighbourhood). How can I do this?

If I do:

idx = numPixels < 70;

I get an error saying : " Maximum variable size allowed by the program is exceeded."

Answer 1

Use bwareafilt instead.