Abstract：
:Blurred images may appear sharper when drifting than when stationary. But, paradoxically, moving sharp edges may appear more blurred. To resolve this paradox, the perceived sharpness of drifting, blurred, square wave gratings was compared with that of their static analogues over a range of speeds, blurs and spatial frequencies. Both motion blur and motion sharpening occurred, depending upon the physical blur of the patterns. For large extents of blur (> 10 min arc) moving patterns always appeared sharper than their static analogues, but for small blurs (< 10 min arc) moving edges appeared more blurred than stationary ones. We present a quantitative model for the distortion of waveforms in motion based on two factors: (i) visual temporal integration that smears moving images, and (ii) a local contrast non-linearity that increasingly sharpens the effective profile of edges as speed and contrast increase. We suggest that a plausible account of the speed-dependent non-linearity is the differential recruitment of M and P cells at different speeds.
journal_name
Vision Resjournal_title
Vision researchauthors
Hammett ST,Georgeson MA,Gorea Adoi
10.1016/s0042-6989(97)00430-6subject
Has Abstractpub_date
1998-07-01 00:00:00pages
2099-108issue
14eissn
0042-6989issn
1878-5646pii
S0042-6989(97)00430-6journal_volume
38pub_type
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