How to calculate NDI Index

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MaxM
MaxM il 19 Mag 2021
Commentato: Stephan il 20 Mag 2021
Hello,
I have to calculate the NDI (Normalized difference index) according to the formula: NDI = 128*(((G-R)/(G+R))+1)
This index is applied to all pixels of the image, giving values between 1 and +1, but to display the image, these values must be between 0 and 255.
Can someone please explain and help me how to do this?

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Stephan
Stephan il 19 Mag 2021
Modificato: Stephan il 19 Mag 2021
NDI_new = uint8(rescale(NDI, 0, 255));
  2 Commenti
MaxM
MaxM il 19 Mag 2021
Thank you for your answer about the rescale. First, how can I calculate the NDI for each pixel of my image ?
Stephan
Stephan il 20 Mag 2021
What are G and R - green and red values? Or what is meant?

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