what the symbol r represent in this equation

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Dear all I want to know what symbol r represent in this equation? Thanks in advance
point-wise intensity transformation T(r) = round(log2(1+(r-80)/64)*100)

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Matt Fig
Matt Fig il 18 Mar 2011
It looks like an independent variable.
  3 Commenti
Matt Fig
Matt Fig il 18 Mar 2011
Where did you get that function? There should be some explanation for its use where you found it.
reem
reem il 18 Mar 2011
The image forest.tif passes through a point-wise intensity transformation
T(r) = round(log2(1+(r-80)/64)*100)
Write a matlab program”fenhc.m” to read image, to call following two functions and to display the resulting image
this is the my question and I do not know how can I do that because I am new student in image processing
thank you so much for your fast answer
your generosity is much appreciated.

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