CODEWITHSUNDEEP
matlabheatmap
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Reputation: 1367

Generate heat map on top of an image using matlab

Here is the scatter plot and the image -I want to generate heat map on a certain image. I have a m by 2 matrix 'templeCoords' (representing the pixel points of the image). I was using the following lines to keep the image on.

C=Imread('nwntemplemap.png');

%% Display the picture
figure, imshow(C)
hold on;
HeatMap(templeCoords);

It opens 2 different windows - one with the image I loaded and the other one is the heat map I guess.

Unfortunately was not able to manage it since working with heat map for the first time. Can anyone help please?

Added Question: Is it even doable to draw heat maps with the available data I mentioned?

The picture on top is the scatter plot of the points and the image -

Upvotes: 4

Views: 7854

Answers (1)

Cici
Cici

Reputation: 1447

I would make the heatmap and overlay your image(is it a maze?) on top of that. and make your image kind of transparent. check this out on how to do it. http://blogs.mathworks.com/steve/2009/02/18/image-overlay-using-transparency/

To use the HeatMap function in matlab,you need to feed in the 2-D histogram(i.e. how many observations at a specific coordinate) for your templeCoords. try this http://blogs.mathworks.com/videos/2010/01/22/advanced-making-a-2d-or-3d-histogram-to-visualize-data-density/

this

http://www.mathworks.com/matlabcentral/fileexchange/29709-function-to-make-a-2d-histogram

or this

http://www.mathworks.com/matlabcentral/fileexchange/14205-2d-histogram

Upvotes: 3

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