Threshold Measurements For Character Jitter On Video Display Terminals

E. J. Casson; J. E. Farrell; C. R. Haynie

doi:10.1117/12.952698

15 August 1989 Threshold Measurements For Character Jitter On Video Display Terminals

E. J. Casson, J. E. Farrell, C. R. Haynie

Proceedings Volume 1077, Human Vision, Visual Processing, and Digital Display; (1989) https://doi.org/10.1117/12.952698
Event: OE/LASE '89, 1989, Los Angeles, CA, United States

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.

Citation Download Citation

E. J. Casson, J. E. Farrell, and C. R. Haynie "Threshold Measurements For Character Jitter On Video Display Terminals", Proc. SPIE 1077, Human Vision, Visual Processing, and Digital Display, (15 August 1989); https://doi.org/10.1117/12.952698

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available