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How can I detect line lies between two certain regions?
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faten Ahmed
on 17 Mar 2020
Commented: Image Analyst
on 18 Mar 2020
I have matrix I and I want to detect and coloring the line ( or thin region) which has DN (4) and located between the region which has DN (0) and the region which has DN (3).
I =
0 0 0 0 4 4 3 3
0 0 0 4 4 3 3 2
0 0 4 4 3 2 2 2
0 4 4 3 3 2 2 3
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Accepted Answer
Image Analyst
on 17 Mar 2020
Simply use
coloredLabels = label2rgb (I, 'hsv', 'k', 'shuffle'); % pseudo random color labels
Here is a full demo:
I =[...
0 0 0 0 4 4 3 3
0 0 0 4 4 3 3 2
0 0 4 4 3 2 2 2
0 4 4 3 3 2 2 3]
hFig = figure;
subplot(2, 1, 1);
imshow(I, [], 'InitialMagnification', 1600);
fontSize = 16;
title('I', 'FontSize', fontSize);
% colorize the matrix
coloredLabels = label2rgb (I, 'hsv', 'k', 'shuffle'); % pseudo random color labels
% coloredLabels is an RGB image. We could have applied a colormap instead.
subplot(2, 1, 2);
imshow(coloredLabels, 'InitialMagnification', 1600);
axis('on', 'image'); % Make sure image is not artificially stretched because of screen's aspect ratio.
title('Colorized I', 'FontSize', fontSize);
hp = impixelinfo; % Show color as use mouses around over image.
![](https://www.mathworks.com/matlabcentral/answers/uploaded_files/277684/image.png)
4 Comments
Image Analyst
on 18 Mar 2020
Take the 3 region and the 0 region and dilate one of them and then AND them. Something like (untested)
region3 = imdilate(labeledImage == 3, true(3));
borderImage = region3 & (labeledImage == 0);
imshow(borderImage, []);
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