The Psychophysics Of Spatial Sampling

Bernice E Rogowitz

doi:10.1117/12.944713

24 June 1988 The Psychophysics Of Spatial Sampling

Bernice E Rogowitz

Proceedings Volume 0901, Image Processing, Analysis, Measurement, and Quality; (1988) https://doi.org/10.1117/12.944713
Event: 1988 Los Angeles Symposium: O-E/LASE '88, 1988, Los Angeles, CA, United States

Abstract

In this paper, we study the physical and psychophysical effects of digital sampling. In particular, we study how spatial sampling (the geometry of the pixel array) and luminance sampling (the distribution of gray levels) affect the image and its perception. Taking the Thin-Film Transistor Liquid Crystal Display (TFT/LCD) as our model, we have simulated four candidate pixel geometries on a color graphics display. We have made psychophysical measurements of visual detectability, reaction time, and rated quality as a function of pixel geometry and grayscale. Our major findings are that (1) the spatial geometry of the sampling array exerts a major influence on visual performance, (2) for suprathreshold judgments of image quality, asymptotic performance is reached with as few as 2-3 bits of grayscale, and (3) the effect of grayscale on performance depends on exposure duration.

Citation Download Citation

Bernice E Rogowitz "The Psychophysics Of Spatial Sampling", Proc. SPIE 0901, Image Processing, Analysis, Measurement, and Quality, (24 June 1988); https://doi.org/10.1117/12.944713

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