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Is there a way to get a "thicker" bwconncomp connection?

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Naim on 19 Jun 2017
Edited: Gopichandh Danala on 20 Jun 2017
See attached image. I have a stack of similar images and I want to remove the large white spaces on the top, bottom, and left of the image.
I used the code:
CC = bwconncomp(BW)
numPixels = cellfun(@numel,CC.PixelIdxList);
[biggest,idx] = max(numPixels);
BW(CC.PixelIdxList{idx}) = 0;
but this sets almost the entire picture black. I suspect it is because there is a little touching between the whites, I want matlab to only pick up the obvious white spaces on the sides. What am i doing wrong?

Answers (1)

Gopichandh Danala
Gopichandh Danala on 20 Jun 2017
Edited: Gopichandh Danala on 20 Jun 2017
If you are just trying to replace all the white pixels in the surroundings to 0, all the connected white valleys on the edges also get removed.
img = rgb2gray(imread('image.png'));
BW = bwlabel(img); % based on labelling algorithm the left top is '1' so backgrounf label is '1'
img(BW == 1) = 0; % replace this label pixels in image to 0
figure, imshow(img);

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