fill holes on BW image with bwconncomp and labelmatrix

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Alex Dashevsky 2017-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/341135-fill-holes-on-bw-image-with-bwconncomp-and-labelmatrix

评论： Walter Roberson 2017-5-21

How can I fill holes on BW image with bwconncomp and labelmatrix without imfill. Give me simple example ,please. for example, I want to fill the star with white.

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回答（1 个）

Walter Roberson 2017-5-20

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https://ww2.mathworks.cn/matlabcentral/answers/341135-fill-holes-on-bw-image-with-bwconncomp-and-labelmatrix#answer_267764

在 MATLAB Online 中打开

x = checkerboard(20,3,5);
y = x;y(rand(size(x))<.3) = 0;
labelmatrix = bwlabel(y);
to_fill = imclearborder(labelmatrix==0, 4);
[~, idx] = bwdist(labelmatrix ~= 0);
filled_label_matrix = labelmatrix;
filled_label_matrix(to_fill) = labelmatrix(idx(to_fill));
subplot(1,2,1); imagesc(labelmatrix);
subplot(1,2,2); imagesc(filled_label_matrix);

Note: for this purpose I defined "hole" in terms of 4 connectivity: with the default 8 connectivity, diagonal empty blocks were considered reachable from each other. You should try both ways and see which is better for your purpose.