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Proceedings Paper

Hyperacuity laser printer
Author(s): Douglas N. Curry
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Paper Abstract

A hyperacuity laser imager utilizes gray source data and overscanned gray exposure to achieve fully saturated black and white image rendering on the photoreceptor at 4800 addressability in both the fast and the slow scan directions, while maintaining 400 lines per inch frequency response. Conventional laser printing techniques render bitmapped images at resolutions finer than required by the human visual system (for example, 600 to 1200 bits per inch) in an unsuccessful attempt to meet a related requirement for edge placement precision of text, line art, and halftones. This excessive bitmapped resolution is inefficient and cumbersome to maintain in a printing system and is still not nearly enough to satisfy the human visual system's need for edge precision. On the other hand, a hyperacuity imager has the edge precision necessary to satisfy the human visual system's needs, and trades off excessive resolution to do so. This paper examines the overscanned, gray exposure characteristics of the hyperacuity laser imager and how it can be viewed as a natural evolution of the current trends in laser printing technology. In addition, it establishes an order of magnitude relationship between addressability and frequency response for a hyperacuity imager, which is shown to significantly match the needs of the human visual system.

Paper Details

Date Published: 18 June 1993
PDF: 12 pages
Proc. SPIE 1912, Color Hard Copy and Graphic Arts II, (18 June 1993);
Show Author Affiliations
Douglas N. Curry, Xerox Palo Alto Research Ctr. (United States)

Published in SPIE Proceedings Vol. 1912:
Color Hard Copy and Graphic Arts II
Jan Bares, Editor(s)

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