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How to Build a Dichoptic Presentation System That Includes an Eye Tracker
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A simple integrative method for presenting head-contingent motion parallax and disparity cues on intel x86
J Szatmary1, I Hadani, B Julesz
1Department of Psychology, Rutgers University, Piscataway, NJ 08854, USA. janos@lvr.rutgers.edu
Spatial Vision
|January 1, 1997
Summary
Researchers recreated a classic head-movement-contingent motion parallax display system using an IBM PC. This low-cost system effectively demonstrates monocular depth perception in random dot patterns.
Area of Science:
- Visual Perception
- Computational Neuroscience
- Human-Computer Interaction
Background:
- The Rogers and Graham (1979) system demonstrated head-movement-contingent motion parallax for monocular depth perception using specialized hardware.
- Replicating this system was previously hindered by the unavailability of its costly, proprietary hardware components.
Purpose of the Study:
- To reproduce the Rogers-Graham method for generating head-movement-contingent motion parallax using readily available, low-cost hardware.
- To enhance the display capabilities for motion parallax using modern PC technology and anti-aliasing techniques.
Main Methods:
- An IBM PC compatible machine with an Intel processor was utilized, eliminating the need for specialized hardware.
- An adapted joystick connected via the standard game-port served as a head-movement sensor.
- Anti-aliasing techniques were employed to enhance monitor resolution by 16 times, enabling real-time display of thousands of random dots at high refresh rates (≥60 Hz).
- A color monitor facilitated the anaglyph method, combining stereoscopic and monocular parallax.
Main Results:
- The reproduced system successfully generated head-movement-contingent motion parallax.
- Psychophysical measurements demonstrated that subjects could effectively null illusory parallax evoked by a static stereogram using real parallax.
- The amount of real parallax needed to null illusory stereoscopic parallax increased monotonically with disparity.
Conclusions:
- The study successfully recreated the Rogers-Graham motion parallax display system using affordable, modern PC hardware.
- The enhanced system demonstrates the feasibility of generating complex visual stimuli for studying depth perception with improved resolution and speed.
- This cost-effective approach facilitates further research into motion parallax and its role in visual perception.
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