A note on luminance calibration of raster-scan cathode-ray tubes: temporal resolution, ripple, and accuracy MICHAEL BACH* Univ.-Augenklinik, Killianstr. 5, D-79106 Freiburg, Germany Received 10 May 1996; revised 5 October 1996; accepted 5 October 1996 Abstract-Accurate luminance calibration is an important issue for stimuli in vision research. Raster-scan cathode-ray tubes present a rapidly scanning spot with a luminance of the order of 10,000 cd m-2 (the actual value depends on video timing and phosphor persistence). With little spatial integration this may result in overloading of the front stage of a photometer. More importantly, even if averaged over hundreds of milliseconds, the pulsed nature of the luminance signal will markedly reduce accuracy of the luminance measurement. A frame-synchronised photometer is described to increase measurement accuracy whilst still rapidly acquiring the result. 1. INTRODUCTION How exactly do we need to calibrate the luminance of a raster-scan cathode-ray tube (CRT)? Naturally, this will depend on the specific experiments. Generally, absolute calibration is not the most important goal. It is economical to search for extreme accuracy only where really necessary. When we try to understand the general properties of the visual system, we would hope that specific results do not change when we
Spatial Vision (continued as Seeing & Perceiving from 2010) – Brill
Published: Jan 1, 1997
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