Distinguishing shadows from surface boundaries using local achromatic cues.

ABSTRACT: In order to accurately parse the visual scene into distinct surfaces, it is essential to determine whether a local luminance edge is caused by a boundary between two surfaces or a shadow cast across a single surface. Previous studies have demonstrated that local chromatic cues may help to distinguish edges caused by shadows from those caused by surface boundaries, but the information potentially available in local achromatic cues like contrast, texture, and penumbral blur remains poorly understood. In this study, we develop and analyze a large database of hand-labeled achromatic shadow edges to better understand what image properties distinguish them from occlusion edges. We find that both the highest contrast as well as the lowest contrast edges are more likely to be occlusions than shado

SUBMITTER: DiMattina C 

PROVIDER: S-EPMC9512248 | biostudies-literature | 2022 Sep

REPOSITORIES: biostudies-literature