Dr. Avi Naiman Profile

Dr. Avi Naiman

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Proceedings Article | 27 August 1992 Paper

Spatial nonlinearities of gray-scale CRT pixels

Avi Naiman, Walter Makous

Proceedings Volume 1666, (1992) https://doi.org/10.1117/12.135955

KEYWORDS: Solids, CRTs, Visualization, Charge-coupled devices, CCD cameras, Human vision and color perception, Raster graphics, Displays, Silicon, Video

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We measured the overall luminance, the luminance profile of individual pixels, and the interactions among neighboring pixels of a grayscale (i.e., non-color) CRT, using a two- dimensional CCD camera. We find that the luminance of a pixel depends on the luminance of the two preceding pixels in the raster, and that the interaction results in superadditivity. Furthermore, the luminance of a pixel depends on the proportion of the screen illuminated. Two consequences of these nonlinearities are that average luminance (as in a halftone image) cannot be predicted from the linear summation of individual pixel spread functions, and that inverting the polarity of a display does not simply invert the luminance profiles. These interactions must be taken into account wherever the luminance profile of displayed stimuli is important.

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