A simple integrative method for presenting head-contingent motion parallax and disparity cues on Intel x86 processor-based machines

Authors: Szatmary, Janos; Hadani, Itzhak; Julesz, Bela

Source: Spatial Vision, Volume 11, Number 1, 1997 , pp. 43-55(13)

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Abstract:

Rogers and Graham (1979) developed a system to show that head-movement-contingent motion parallax produces monocular depth perception in random dot patterns. Their display system comprised an oscilloscope driven by function generators or a special graphics board that triggered the X and Y deflection of the raster scan signal. Replication of this system required costly hardware that is no longer on the market. In this paper the Rogers-Graham method is reproduced with an Intel processor based IBM PC compatible machine with no additional hardware cost. An adapted joystick sampled through the standard game-port can serve as a provisional head-movement sensor. Monitor resolution for displaying motion is effectively enhanced 16 times by the use of anti-aliasing, enabling the display of thousands of random dots in real-time with a refresh rate of 60 Hz or above. A color monitor enables the use of the anaglyph method, thus combining stereoscopic and monocular parallax on a single display without the loss of speed. The power of this system is demonstrated by a psychophysical measurement in which subjects nulled head-movement-contingent illusory parallax, evoked by a static stereogram, with real parallax. The amount of real parallax required to null the illusory stereoscopic parallax monotonically increased with disparity.

Document Type: Research article

DOI: http://dx.doi.org/10.1163/156856897X00050

Affiliations: 1: Laboratory of Vision Research, Department of Psychology, Rutgers University, Busch Campus, Piscataway, NJ 08854, USA

Publication date: 1997-01-01

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