converting boundary to mask

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Ibrahim Thorig
Ibrahim Thorig 2014-3-7
评论： Image Analyst 2014-3-13
lets assume that this is the code i used to identify the boundary. I want display the selected boundary in new window else convert this to mask. is it possible.. some one please help me
I = imread('F:\project_matlab\dataset\002.jpg');
BW = im2bw(I, graythresh(I));
[B,L] = bwboundaries(BW,'noholes');
imshow(label2rgb(L, @jet, [.5 .5 .5]))
hold on
for k = 1:length(B)
boundary = B{k};
plot(boundary(:,2), boundary(:,1), 'w', 'LineWidth', 2)
end

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Dishant Arora
Dishant Arora 2014-3-7
b=bwboundaries(BW); % BW being your binary image
mask=false(size(BW));
for i = 1:length(b)
for j = 1:length(b{i})
ind = b{i}(j,:);
mask(ind(1),ind(2))=1;
end
end
figure
imshow(mask)
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Dishant Arora
Dishant Arora 2014-3-13
BW = imfill(BW , 'holes') % will give you desired mask
Image Analyst
Image Analyst 2014-3-13
No need to get boundaries on that image. Simply threshold. The it depends on what you mean by "extract". What does that mean to you? To you mean crop? Do you want the white bar along the bottom of the image also to be included? What about the white torn edge? It can go from simple to complex depending on exactly what you want to do and what kind of images the algorithm can be expected to encounter.

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