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Proceedings Paper

Correcting the adjacent pixel nonlinearity on video monitors
Author(s): Q. James Hu; Stanley A. Klein
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Paper Abstract

In raster-scan CRT display systems, the luminous flux of a given pixel is affected by the preceding pixel along the raster direction. This spatial or adjacent pixel nonlinearity can adversely affect image quality. High contrast, high spatial frequency regions of an image will have wrong luminances. A simple lookup table (standard gamma correction) can not correct this nonlinearity. We measured the spatial nonlinearity under a variety of luminance conditions in two CRT displays. A model proposed by Mulligan and Stone was used in a 5 parameter nonlinear regression to fit the data. Results show that the model fit our data very well. We employed a 2-D lookup table to compensate for the spatial nonlinearity. The new lookup table has two entries: the intended luminance of the current pixel and the actual voltage of the previous pixel. The output of the new lookup table is the adjusted voltage which compensates for the pixel interaction and gives the correct average luminance for that pixel. Psychophysical experiments show that at small pixel sizes (less than 0.8 min), the compensation results in a sharp accurate image.

Paper Details

Date Published: 1 May 1994
PDF: 10 pages
Proc. SPIE 2179, Human Vision, Visual Processing, and Digital Display V, (1 May 1994); doi: 10.1117/12.172696
Show Author Affiliations
Q. James Hu, Univ. of California/Berkeley (United States)
Stanley A. Klein, Univ. of California/Berkeley (United States)


Published in SPIE Proceedings Vol. 2179:
Human Vision, Visual Processing, and Digital Display V
Bernice E. Rogowitz; Jan P. Allebach, Editor(s)

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