Discrim is a program, written in Matlab, that allows the user to
manipulate a set of images and then estimate the ability of an observer to
discriminate a pair of these images based on models of the human observer and
of the sensor and display system used to record and show the images.
Here is a paper describing what the software does in general terms:
MS-WORD
PDF
Here is a user's manual describing the software in detail:
MS-WORD
PDF
Here is the Matlab source code for discrim:
discrim.m
Here are two test images which differ ever so slightly:
svsbwred1.tif
svsbwred2.tif