How can a greyscale image be labeled?
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Sheema Khattak
il 29 Apr 2014
Commentato: Sheema Khattak
il 30 Apr 2014
How can a greyscale image be labeled?
As bwlabel() works for labeling binary image how can we do the same for greyscale image in matlab
2 Commenti
Image Analyst
il 29 Apr 2014
What's the use case? Why do you want this? What are you going to do with it? Can you give an example of the output you want for a small 7 by 7 image like this:
grayLevelImage =
1 1 2 4 5 5 1
5 4 1 3 2 1 5
3 2 1 3 2 1 4
5 1 1 3 3 1 4
2 3 4 1 4 1 1
3 1 2 3 3 4 5
4 1 3 5 2 3 5
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Walter Roberson
il 29 Apr 2014
Modificato: Walter Roberson
il 29 Apr 2014
labelled_image = zeros(size(YourImage),'uint16');
label_hw = 0;
max_grey = max(YourImage(:));
for K = 1 : max_grey
T = bwlabel(YourImage == K);
numlabel_here = max(T(:));
for L = 1 : numlabel_here
labelled_image(T == L) = label_hw + L;
end
label_hw = label_hw + numlabel_here;
end
At the end of this, labelled_image will be labelled such that each connected area that is all a single greyscale level will be considered to be a single class.
This is unlikely to be what you want: you probably want that "nearby" greyscale levels are merged together but that "edges" are recognized. That kind of separation is what segmenting is for.
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