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Converting r g b triplets into a single physical quantity

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Souvik Mukherjee
Souvik Mukherjee 2017-11-8
编辑： Image Analyst 2017-11-24
I used
tst1=imread('tst.png');
[x, map]= rgb2ind(tst1,55);
x2=im2double(x,'indexed');
Thus each element in the matrix x2 contains a value from 0 to 55 which represents the row in the 55 x 3 matrix map and contains the r,g,b triplet value.
My question is how do I now convert x2 into a matrix where the rgb triplet values will represent pressure values ranging from 1500 to 7000 psi? Can't use imadjust as I don't have license for that. Any other workarounds?
Thanks.
Souvik
  1 个评论
Gayatri Menon
Gayatri Menon 2017-11-24
How will the pressure value related to x2 matrix?Are you looking for a linear mapping between x2 and the pressure value?

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回答（1 个）

Image Analyst
Image Analyst 2017-11-24
编辑：Image Analyst 2017-11-24
Doesn't tst1 already have that info? Just do
pressureImage = (7000-1500) * mat2gray(tst1) + 1500;
By the way, if you're using im2double() successfully, then you have the Image Processing Toolbox and could use imadjust() if you want.

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