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Extract numeric values ​​from a colormap

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Richard Wood
Richard Wood on 19 May 2024 at 16:02
Edited: Image Analyst on 19 May 2024 at 18:13
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?

Answers (1)

Image Analyst
Image Analyst on 19 May 2024 at 18:12
Edited: Image Analyst on 19 May 2024 at 18:13
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:
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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