title: Types of size disparity and the perception of surface slant.
abstract: We examined (i) perceived slant of a textured surface about a vertical axis as a function of disparity magnitude for horizontal-size disparity, vertical-size disparity, and overall-size disparity; and (ii) interactions between patterns with various types and magnitudes of size disparity and superimposed or adjacent zero-disparity stimuli. Horizontal-size disparity produced slant which increased with increasing disparity, was enhanced by superimposed zero-disparity stimuli, and induced contrasting slant in superimposed or adjacent zero-disparity stimuli. Vertical-size disparity produced opposite slant (induced effect) which was reduced to near zero by a superimposed zero-disparity pattern and both patterns appeared as one surface. Adjacent vertical-size-disparity and zero-disparity patterns appeared as separate surfaces with a wide curved boundary. Overall-size disparity produced slant which was enhanced by a superimposed zero-disparity pattern and less so by a zero-disparity line, and induced more slant in a zero-disparity line than in a zero-disparity pattern. The results are discussed in terms of depth underestimation of isolated surfaces, depth enhancement, depth contrast, and the processing of deformation disparity.
authors.affiliation: Air Force Research Laboratory, Mesa, AZ 85206-0904, USA. alhra.af.mil
authors.forename: B J
authors.initials: BJ
authors.lastname: Pierce
authors.forename: I P
authors.initials: IP
authors.lastname: Howard
mesh_terms: D000328:Adult; D003196:Computer Graphics; D003867:Depth Perception; D005260:Female; D006801:Humans; D008297:Male; D011581:Psychological Tests; D012858:Size Perception