A model consisting of multiple tuned and oriented spatial filters followed by non-linear transducer functions is described. The model was originally derived to account for human perception of contrast while viewing isolated stimuli. The model can also account for human estimates for the image sharpness of spatially filtered real world scenes. The model has several shortcomings uncovered by recent experimental results involving suppression of the apparent contrast of a foveally presented grating patch by a peripheral grating.
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