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

Question

Naim 2017-6-19

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345361-is-there-a-way-to-get-a-thicker-bwconncomp-connection

编辑： Gopichandh Danala 2017-6-20

mathworks.PNG

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?

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Gopichandh Danala 2017-6-20

can you upload the original image

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Answer 1

Gopichandh Danala 2017-6-20

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/345361-is-there-a-way-to-get-a-thicker-bwconncomp-connection#answer_271335

编辑：Gopichandh Danala 2017-6-20

在 MATLAB Online 中打开

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);