Journal of Electronic ImagingHyperacuity laser imager
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A hyperacuity laser imager utilizes gray source data and overscanned (enhanced sampling reconstruction) gray exposure to achieve fully saturated black-and-white image rendering on the photoreceptor at 4800/in. addressability in both the fast and the slow scan directions, while maintaining a 400 lines/in. frequency response. Conventional laser printing techniques render bit-mapped images at resolutions finer than required by the human visual system (for example, 600 to 1200 bit/in.) in an attempt to meet a related requirement for edge placement, precision of text, line art, and halftones. Unfortunately, this excessive bit-mapped resolution is inefficient and cumbersome to maintain in a printing system and is stiil 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. We examine the overscanned, gray exposure characteristics of the hyperacuity laser imager and discuss how it can be viewed as a natural evolution of the current trends in laser printing technology. In addition, an order of magnitude relationship is established between addressabiity and frequency response for a hyperacuity imager, which is shown to significantly match the needs of the human visual system.