plot points with x, y coordinate over a image

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Sara Antonio 2016-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/286447-plot-points-with-x-y-coordinate-over-a-image

评论： Image Analyst 2016-5-30

Hi,

I have a matrix n,m with some z values that I plot in a imagesc. Then, I have another matrix with the same dimensions (n,m) with other z values. I want to overlap on top of my initial imagesc some dark dots with n,m position taken from my second matrix. It really doesn't matter to show which value it is, but yes the position it has. To have a better idea of what i want to do, it would be like an imagesc image with 2 dots in every column showing where the max and min of the second matrix are, looking like kinda as a contour. I tried already contour, contourf, imagesc but none of them seem to give me what I want. Is there some way so I can have a plot(x,y,z) (in 2 dimensions) so it can overlap a imagesc?

Thanks in advance, Sara

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Answer 1

Image Analyst 2016-5-30

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https://ww2.mathworks.cn/matlabcentral/answers/286447-plot-points-with-x-y-coordinate-over-a-image#answer_223847

How are you calling imagesc()? Do you have an image array? If so, just set those rows to 0 for each column.

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Sara Antonio 2016-5-30

I already tried that. I mean, I transform my second matrix as a zero matrix with 1 in the positions I want, but then it overlaps totally the first image because it attributes a color to zero.