||Recovery of 3D volume from 2-tone images of novel objects.
This study discusses the viability of bottom-up approaches for the recovery of 3D structure from 2-tone images of novel objects. The authors hypothesized that if the perceived volumetric appearance of 2-tone images is attributable to the prior recovery of low-level structure such as corners, edges, volumetric primitives or familiar parts, then novel single and multiple part objects should appear volumetric as readily as familiar objects. Empirical support for this hypothesis would indicate that a part-based explanation of 2-tone image perception is sufficient. However, if images of novel objects appeared fragmented and 2D, or the volumes depicted could not be accurately recovered, an account of 2-tone image perception mediated by object familiarity, or top-down knowledge would gain support. Two approaches were considered in three experiments: the volumetric primitives approach and the line labeling approach. The authors conclude that 2-tone image perception is not mediated by bottom-up extraction of geometrical features such as junctions or volumetric parts, but may rely on previously stored representations in memory and a model of the illumination of the scene. (PsycINFO Database Record (c) 2007 APA, all rights reserved)