Copyright 2004 Ken Greenebaum
Signal + Noise recoverable from ROC
nBlobs are normalized
nhave an area of 1.0
nequivalent to probabilities 
nProbability of False Positive is
n1.0 - probability of Correct Reject
nProbability of Correct Detect is
n1.0 - probability of False Reject
nConsequently: Each point on the ROC curve
nEncodes all signal and threshold info