Relative and absolute stereo slant

Abstract

Relative stereo slant is better perceived than absolute slant, especially for vertical axis slant (Gillam,(P&P 1984,JEP 1988). This is attributed either to the unambiguity of relative slant (van Ee et al, Perception 1999) the presence of second derivatives of disparity (Howard and Rogers, 1995) or the presence of a gradient of relative disparity (Gillam, 1984, 88).Slant contrast in the unslanted surface is attributed by Pierce and Howard (Perception, 1997), van Ee and Erkelens (Vis Res, 1996) and others to normalisation of the slanted surface while relative slant is maintained. To determine (a) the basis of relative slant effectiveness and (b) the adequacy of the normalisation explanation of..