Click here for an excercise in MaxEnt unfolding starring my cat Newton (PS or gif).
(a) The original "true" image. (b) The image blurred with a Gaussian point spread function with sigma 60% of the pixel size. (c) The maximum entropy unfolded image. The histograms to the right show the light intensity in row 36 (indicated by arrows next to the photos). A complete discussion of unfolding techniques can be found in Chapter 11 of Statistical Data Analysis.