How do i highlight certain region in an image?

Question

revathi t 2016-4-18

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https://ww2.mathworks.cn/matlabcentral/answers/279530-how-do-i-highlight-certain-region-in-an-image

回答： Afiq Azaibi 2024-4-26

I have done classification for lung diseases. How do i verify that images has been classified correctly. For example, Train image with affected region & Test image with affected region. How do i highlight these affected region?

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Answer 1

Image Analyst 2016-4-18

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You can use an overlay

http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image

Or you can use bwboundaries() to get the outline of the region and then use plot() to put up a colored outline.

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Answer 2

Afiq Azaibi 2024-4-26

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在 MATLAB Online 中打开

Starting in R2024a, xline, yline, xregion, and yregion all support the ability to appear both behind and in front of objects in an axes using the Layer property:

plot(1:10, LineWidth=4);

x1 = xline(2,LineWidth=4,Alpha=1);

x2 = xline(3,LineWidth=4,Alpha=1,Layer='bottom');

x3 = xregion(4,5,FaceAlpha=1);

x4 = xregion(6,7,FaceALpha=1,Layer='top');

The default for ConstantRegion (the underlying object for xregion and yregion) is to appear in the 'bottom' layer and the default for ConstantLine (the underlying object for xline and yline) is to appear in the 'top' layer.