How can I plot a heatmap on a custom image?

2017 12 13
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更新时间：2017 12 14
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Hi all,
I have a matrix of size 5x40, which I have been plotting using imagesc. This matrix corresponds to a heatmap of activity in different regions along the hand/forearm(from fingernails to elbow) during an experiment performed. When I use imagesc on this matrix, it understandably plots a grid of size 5x40 with intensities in each grid square corresponding the value within the matrix.
Instead of in a grid form, I would like to plot these data on an image of an actual hand/forearm. Assuming I have an outline corresponding to the hand and forearm, how can I plot the heatmap on this image?
I have been playing around for a while with the image, trying to obtain its coordinates, and reshape the matrix that I have to fit the coordinates of the image, etc but am having difficulty.
Any advice?
Thanks in advance!!

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Image Analyst
Image Analyst 2017-12-13

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Srinivas Chivukula
Srinivas Chivukula 2017-12-13
Thanks for the prompt reply.
The issue is that the underlying image is of a different shape...
so if I resized the heatmap and overlayed it onto the image, portions of the heatmap would show outside the boundaries of the hand/forearm.
I think I need to reshape the heatmap to the exact size of the outline of the hand/forearm, or somehow segment the hand and forearm and then point a value from my matrix to each segmented region. But I'm not sure how to do this....
Image Analyst
Image Analyst 2017-12-14
Why are they different sizes? And why can't you just resize the heatmap to be the same size as the RGB image? You can use imresize() for that.

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