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Proceedings Paper

Visual detection of sampling and quantization artifacts on sinusoidal luminance gradients
Author(s): Adar Pelah; Fergus W. Campbell
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Paper Abstract

The human visual system's response to luminance discontinuities on continuous image gradients is measured. It is argued that since quantization artifacts often appear on smooth gradients, the versatility of sinewave gratings in controlling gradient properties can be used to quantify worst-case situations. The threshold spatial dimensions of discrete steps, such as would appear in a staircase approximation to the grating, are determined under a variety of experimental conditions. The smallest threshold step size defines a critical sample size, which is used to calculate limits for artifact-free reconstruction of sinusoidal luminance gratings. Rather than employ ad hoc collections of test images, the methods and results described suggest a more general approach to achieving visually optimal allocation of imaging resources.

Paper Details

Date Published: 8 September 1993
PDF: 11 pages
Proc. SPIE 1913, Human Vision, Visual Processing, and Digital Display IV, (8 September 1993); doi: 10.1117/12.152697
Show Author Affiliations
Adar Pelah, Univ. of Cambridge (United Kingdom)
Fergus W. Campbell, Univ. of Cambridge (United Kingdom)

Published in SPIE Proceedings Vol. 1913:
Human Vision, Visual Processing, and Digital Display IV
Jan P. Allebach; Bernice E. Rogowitz, Editor(s)

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