what the symbol r represent in this equation

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)

Answer 1

[Matt Fig]

It looks like an independent variable.

[reem]

Thank you so much

I have question to read image and then passes the image through this equation but I do not know how can I do that and what symbol r is represent,all this in image processing.

[Matt Fig]

Where did you get that function? There should be some explanation for its use where you found it.

[reem]

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.