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How can a greyscale image be labeled?

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Sheema Khattak
Sheema Khattak 2014-4-29
评论： Sheema Khattak 2014-4-30
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 个评论
Image Analyst
Image Analyst 2014-4-29
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
Sheema Khattak
Sheema Khattak 2014-4-30
I need to label the segmented portions of image for identification.No not small one

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Walter Roberson
Walter Roberson 2014-4-29
编辑：Walter Roberson 2014-4-29
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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