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Proceedings Paper

Threshold Measurements For Character Jitter On Video Display Terminals
Author(s): E. J. Casson; J. E. Farrell; C. R. Haynie
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Paper Abstract

Increasing the refresh frequency of a video display terminal above the line frequency can create character jitter due to interference between the line frequency and refresh frequency. We measured threshold for character jitter on high luminance, positive polarity displays for a range of differences between line and refresh frequency (difference frequencies or DFs). The results indicate an average threshold of about 17 arc sec for a range of DFs. The function relating threshold amplitude to DF is independent of line frequency and closely resembles the results of displacement threshold studies. This suggests that the detection of character jitter is very similar to the hyperacuity task of detecting the minimal displacement of a single line. This implies that jitter threshold will be effected in the same fashion by such variables as blur, luminance and presence or absence of reference lines.

Paper Details

Date Published: 15 August 1989
PDF: 6 pages
Proc. SPIE 1077, Human Vision, Visual Processing, and Digital Display, (15 August 1989); doi: 10.1117/12.952698
Show Author Affiliations
E. J. Casson, University of California, Davis (United States)
J. E. Farrell, Hewlett Packard (United States)
C. R. Haynie, Hewlett Packard (United States)

Published in SPIE Proceedings Vol. 1077:
Human Vision, Visual Processing, and Digital Display
Bernice E. Rogowitz, Editor(s)

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