A computerized random element stereogram generator: Design and experiments

A microcomputer-based generator for random-element stereograms that generates different visual stimuli is described. The system allows any solid-shaped target to be programmed and varied in size or shape, movement and disparity. The generator creates elements on a color monitor with resolution of 750x512 pixels. Target size is dependent on overall monitor size, and programmable movement varies over a large range with three types of movement possible: sinusoidal, triangular and square wave. Both the disparity of the target and the background can be varied by seven picture elements. The entire system consists of a host computer, custom hardware for random stereogram generation, and software. The versatility of the system is demonstrated with eye movement and visual evoked response data. >