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Motion blur and motion sharpening: Temporal smear and local contrast non-linearity

Measured the perceived blur of a number of drifting waveforms as a function of speed, blur, and spatial frequency. Two Ss were presented horizontal periodic patterns whose luminance profile was manipulated such that the hard edges of a square wave were replaced by half a cycle of a sine-wave centered on the edges. The results are considered with respect to both periodicity and local profile and a quantitative model for the distortion of waveforms in motion is presented: (1) visual temporal integration that smears moving images; and (2) a local contrast non-linearity that increasingly sharpens the effective profile of edges as speed and contrast increase. It is suggested that a plausible account of the speed-dependent non-linearity is the differential recruitment of M and P cells at different speeds. (PsycINFO Database Record (c) 2005 APA, all rights reserved)



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