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How to do scatter/plot overlaying an imagesc/pcolor plot?

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Michael
Michael 2015-8-25
评论： Adam 2015-8-26
I have a matrix (200 x 200), which I do: imagesc(v(1:200),v2(1:200), matrix); This is an extrapolated Matrix, and now I wish to scatter / plot my data point observations locations on top of this matrix field.
How would I go about doing this? I thought maybe I could imagesc a matrix of the scattered observation with increased transparency? but I guess there must be a better way to do this..

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回答（1 个）

Image Analyst
Image Analyst 2015-8-25
Don't use pcolor() unless you're happy not displaying the last row and column of your image.
To overlay one image on top of another, see these links:
http://www.mathworks.com/matlabcentral/answers/104889-how-to-overlay-a-foreground-image-over-a-background-image
http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/
To plot or scatter points, then just call hold on and then scatter() or plot():
imshow(yourImage);
hold on;
plot(x,y, 'rd', 'MarkerSize', 30); % Plot red diamonds over image.
  2 个评论
Michael
Michael 2015-8-26
Thanks for your help, however, I am not using images, I am using imagesc (although, now contourf) to display data. How would I do it in this case?
Adam
Adam 2015-8-26
The general idea should be the same whatever function you are using to plot your image data.

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