Share Email Print

Proceedings Paper

Effect of lighting direction on the perception of shape in graphic displays
Author(s): Roger A. Browse; James C. Rodger; Robert A. Adderley
Format Member Price Non-Member Price
PDF $17.00 $21.00
cover GOOD NEWS! Your organization subscribes to the SPIE Digital Library. You may be able to download this paper for free. Check Access

Paper Abstract

Accurately conveying three-dimensional shape is a requirement for many computer graphic applications. The general belief that we call the photorealism assumption asserts that understanding of depicted object shapes improves with increasing realism of the display. We contend that parameters determining a graphic rendering vary widely in importance for accurately portraying shape. By identifying the relative contributions of rendering parameters, we provide a framework for developing cost-effective display systems. Our current work concerns the role of light direction in conveying the three-dimensional shape of depicted objects. In our experiments, we present sequences of displays that each show an elongated superquadric object. An observer attempts to reproduce the shape of the cross section orthogonal to the elongated axis by adjusting a sample contour. The object rotates continuously so that observers solve the task from an overall understanding of the shape, rather than from static two-dimensional features. We vary the shapes of the superquadric objects, as well as the illumination directions. Our results indicate that the accuracy of observer's estimates is surprisingly robust to these variations.

Paper Details

Date Published: 3 June 1997
PDF: 8 pages
Proc. SPIE 3016, Human Vision and Electronic Imaging II, (3 June 1997); doi: 10.1117/12.274532
Show Author Affiliations
Roger A. Browse, Queen's Univ. (Canada)
James C. Rodger, Queen's Univ. (Canada)
Robert A. Adderley, Queen's Univ. (Canada)

Published in SPIE Proceedings Vol. 3016:
Human Vision and Electronic Imaging II
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

© SPIE. Terms of Use
Back to Top