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

AbstractBlurred 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 (>10min arc) moving patterns always appeared sharper than their static analogues, but for small blurs (