MATLAB: Conversion of a greyscale thermal image to pseudo colour thermal image

Image Processing Toolboxpseudo colourthermal image

How can a grayscale thermal image be converted to a pseudo colour thermal image as per standard colour coding conventions that are used for representing thermal images? Matlab code for achieving this task would be highly appreciated.

Best Answer

There is no standard coloring convention. Thermal camera software will give you the ability to choose from several colormaps. You can turn your grayscale thermal image into an RGB pseudocolored image with the function ind2rgb(). For example

myColorMap = summer(256); % Whatever you want.
rgbImage = ind2rgb(thermalImage, myColorMap);

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clear; clc;
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MATLAB: Thermal images

You need to analyze the original grayscale image, not the rgb pseudocolored image. To verify you should look at pixel values and compare the intensity at that location with the temp measured with another device, like a thermometer, and use on individuals known to have, or not have, fever.

To apply pseudocolors, use the colormap() function. There are a variety of built-in colormaps you can choose from, in addition to building your own custom colormap.

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MATLAB: Thermal images

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