[WM]: Creating ROC Curves

[Mr jim jim <galaxions1@yahoo.co.uk>]

Hi all,
   I am new to watermarking and have been implementing some techniques. I have come across the use of ROC curves and wondered if
anyone could explain how I create them?
   I have seen somewhere that you test an image with watermarks which are embedded and also ones not embedded. How many of these
tests should I do? You need to create histograms from the detector output - is this just the ranges of values which the detector
returns? Do you create ranges which the output falls into? You then need to fit Gaussians to these two pdfs
- how does one do this and from there calculate the probability of false and probability of false rejection. 

Any help would be really appreciated,
Jim




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