Contrast matching of two-dimensional compound gratings
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K Tiippana1, R Näsänen, J Rovamo
1Department of Vision Sciences, University of Aston, Birmingham, England.
Vision Research
|May 1, 1994
Abstract:
The contrast of a two-dimensional compound grating consisting of 2, 3 or 4 components with the same spatial frequency but different orientations was matched to the contrast of a simple cosine grating. At all spatial frequencies and contrast levels studied the stimuli which matched in apparent contrast had nearly equal r.m.s. (root-mean-square) but different Michelson contrasts. Thus, matching was based on r.m.s. contrast which takes into account the distribution of luminance levels in the stimulus. A matched filter provides a simple model to explain the contrast matching results.