How to superimpose contourf plot over a gray scale image

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Liping 2013-7-6

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评论： chris crowley 2022-3-13

I'm encountering a problem to superimpose contourf plot over a gray scale image. i uesd "imagesc" to show the gray image and "hold on, contourf" to show the data plot. Also, i tried using two colormaps in a same figure. But that was not working. please give me some advice to overcome it.thank you!

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dpb 2013-7-7

For what definition of "not working"

I'm not image expert but you'll have make use of transparency to see anything "thru" the top layer...

Show what you did do so a real expert on images can point out specific difficulties. Using one of the sample installed images and providing a generating function (short, preferably) for the contour object would be pluses so can be reproduced easily. Sure, it's not precisely your specific problem but methods are methods...

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Answer 1

David Sanchez 2013-7-8

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Solution given Teja Muppirala more than a year ago:

%Make some sample grayscale image
I = abs(sin((1:500)'/100)*sin((1:500)/100));
% Convert the grayscale image to RGB
Irgb = cat(3,I,I,I);
%Plot the image and some contours in color
image(Irgb)
hold all
contour(I);