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what the symbol r represent in this equation

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reem
reem 2011-3-18
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 2011-3-18
It looks like an independent variable.
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Matt Fig
Matt Fig 2011-3-18
Where did you get that function? There should be some explanation for its use where you found it.
reem
reem 2011-3-18
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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