Accession Number : ADA255956

Title :   Computational Algorithms for Increased Control of Depth-Viewing Volume for Stereo Three-Dimensional Graphic Displays.

Descriptive Note : Technical memo,

Corporate Author : NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER

Personal Author(s) : Williams, Steven P. ; Parrish, Russell V.

Report Date : AUG 1992

Pagination or Media Count : 26

Abstract : Three-dimensional pictorial displays incorporating depth cues by means of stereopsis offer a potential means of presenting information in a natural way to enhance situational awareness and improve operator performance. Conventional computational techniques rely on asymptotic projection transformations and symmetric clipping to produce the stereo display. Implementation of two new computational techniques, an asymmetric clipping algorithm and a piecewise linear projection transformation, provides the display designer with more control and better utilization of the effective depth-viewing volume to allow full exploitation of stereopsis cuing. Asymmetric clipping increases the perceived field of view (FOV) for the stereopsis region. The total horizontal FOV provided by the asymmetric clipping algorithm is greater throughout the scene viewing envelope than that of the symmetric algorithm. The new piecewise linear projection transformation allows the designer to creatively partition the depth-viewing volume, with freedom to place depth cuing at the various scene distances at which emphasis is desired.

Descriptors :   *DEPTH, *STEREOSCOPIC DISPLAY SYSTEMS, ALGORITHMS, AWARENESS, CONTROL, REGIONS, THREE DIMENSIONAL, TRANSFORMATIONS, UTILIZATION, VOLUME, COMPUTATIONS.

Subject Categories : Computer Programming and Software
      Electrooptical and Optoelectronic Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE