Putting a legend on a fused image

Question

Stacy Genovese 2022-4-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1693100-putting-a-legend-on-a-fused-image

评论： Stacy Genovese 2022-4-10

I have the following code:

figure()
total_grid = imfuse(pB_grid, pA_grid, "falsecolor");
imshow(total_grid,'InitialMagnification', 800)
title("Initial placement of cells")

Is there anyway to add a legend to this to make clear which points are from the pB_grid and which are from the pA_grid?

Thanks

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Stacy Genovese 2022-4-10

Thank you so much! This worked.

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Answer 1

DGM 2022-4-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1693100-putting-a-legend-on-a-fused-image#answer_939355

编辑：DGM 2022-4-10

在 MATLAB Online 中打开

Here's one way to work around the issue:

A = imread('cameraman.tif');

B = fliplr(A);

F = imfuse(A,B,'falsecolor');

imshow(F); hold on

% use empty scatter objects to give legend() something to use

ha = scatter([],[],10,[0 1 0],'filled');

hb = scatter([],[],10,[1 0 1],'filled');

legend([ha hb],{'image A','image B'})

Depending on the object content of the images being used, the result may be totally counterintuitive. In the above example, the legend is correct. Image A is represented in green, but the primary feature is a man in dark clothing, so he's filled with the bright regions of image B. As a consequence, he's apparently the exact opposite of the color indicated by the legend. Using imfuse() like this is a great way to make things confusing unless all your objects are positive (bright) features.