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Extract numeric values ​​from a colormap

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Richard Wood
Richard Wood 2024-5-19
编辑： Image Analyst 2024-5-19
Hello everyone
I am trying to extract the numerical values ​​of a variable represented in the following colormap with its respective colorbar (which I also attach in PDF format):
It would be very desirable to be able to create a database based on the spatial deviation from the center of the hexagon along the directions defined by the a1 and a2 vectors as a fraction of a0, being a0 the modulus of the aforementioned vectos:
Any idea?

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回答（1 个）

Image Analyst
Image Analyst 2024-5-19
编辑：Image Analyst 2024-5-19
You need to read that colorbar part of the image and then divide by 255.
colorsInBar = rgbImage(row1:row2, col1:col2, :);
[r, g, b] = imsplit(colorsInBar);
cMap = double([r(:), g(:), b(:)]) / 255;
You may be interested to see how I did it for thermal images:
https://www.mathworks.com/matlabcentral/fileexchange/113995-thermal-image-color-to-temperature?s_tid=srchtitle
To get the numbers you can use ocr in the Computer Vision Toolbox, but the numbers must be at least 20 pixels high.

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