heatmap gradients: change intensity

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Jessica
Jessica 2015-5-10
评论： Walter Roberson 2015-5-10
I have created a heatmap with coordinates on an image. The problem is that coordinates that are near each other are appearing more intense because they are clustered (not because their individual intensities are greater). Is it possible to create the heatmap such that each coordinate is displayed with an intensity that matches its exact frequency and not lumped with the surrounding coordinates.
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Image Analyst
Image Analyst 2015-5-10
Please attach screenshot(s) so we can visualize what you're talking about. Attaching sample data and a script to create the visualization would also be useful. Use the green and brown frame icon to attach the picture and the paperclip icon to attach your m-file.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-5-10
pointsize = 15; %fiddle with this
scatter3(Xvector, Yvector, zeros(length(Zvector),1), pointsize, Zvector()); %use Z as color index on flat plot
grid off
view([0 90]); %look from the top onto the flat 3D plot.
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Image Analyst
Image Analyst 2015-5-10
I was thinking they'd have a continuous, solid surface like they'd use scatteredInterpolant on a handful of scattered intensity measurements.
Walter Roberson
Walter Roberson 2015-5-10
Except they specifically asked for each coordinate displayed with local intensity, not consolidated with surrounding, which scatteredInterpolant would do.
I am making assumptions here about how the heatmap was generated. The heatmap routines I find such as in the Bioinformatics toolbox and in the File Exchange work with grids of data and pretty much come out the same as imagesc(Data) it appears. So I am assuming that the poster is using a different routine entirely that is gridding the data. But I don't know which routine they are using.

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