Raster-scan cathode-ray tubes for vision research- limits of resolution in space, time and intensity, and some solutions MICHAEL BACH,1,* THOMAS MEIGEN2 and HANS STRASBURGER3 1 Univ.-Augenklinik, Killianstr. 5, D-79106 Freiburg, Germany 2Univ.-Augenklinik, Wiirzburg, Germany 3Inst. f. Med. Psychologie, Ottn-von-Guericke Universität, D-39120 Magdeburg, Germany Received 15 June 1996; revised 4 October 1996; accepted 4 October 1996 Abstract-Raster-based cathode-ray tubes (CRTs) are increasingly used for stimulus presentation. While very flexible, their design based on consumer electronics can limit their value in vision research. Here their limitations of resolution in time, space, intensity and wavelength are systematically compiled. Often, ingenious ideas can circumvent such limitations for specific experiments. Some ad-hoc solutions, as well as the more general techniques of dithering and anti-aliasing, are presented. 1. INTRODUCTION Computer-controlled visual display units are increasingly used to present stimuli for vision experiments. With few exceptions, they are designed for consumer electronics, are developed under commercial constraints for large quantity production, and repre- sent a compromise between image quality and cost within current technology. Vision science therefore, through its interest in the limits of vision, immediately encounters the limitations of the apparatus. Most vision experiments now use raster-based cathode-ray tubes (CRTs). Usually, they are based
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1997
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