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Edge Enhancement for Good Image Quality in Digital Halftoning

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Digital halftoning algorithm is a method for representing a continuous tone image with a few discrete level of output-device. Most representative two methods of halftoning are screening (or dithering) and error diffusion. Specially, clustered screening has a fast processing speed and robustness to printer distortion and laser bean printer uses it generally. But, it has a poor quality in detail region, because of screen table's LPI geometry. In general, screen table mostly have 150∼200 LPI. That LPI is not sufficient to represent a good quality at image edge. Our proposal improves the quality of detail region by using edge map and edge-optimized table at edge region differentiated from non-edge region. Edge-optimized screen is not a simple higher LPI screen than non-edge region. We have investigated the best dot-addition position for good edge image quality in visually at each screen table. And then, we composed the edge optimized screen table that makes it. If the image is edge region, edge-optimized screen is used. If not, we use default screen. We show the result screening images in simulated output and scanned image of real hard copy output in laser printer compared with previous methods.

Document Type: Research Article

Publication date: January 1, 2011

More about this publication?
  • For more than 25 years, NIP has been the leading forum for discussion of advances and new directions in non-impact and digital printing technologies. A comprehensive, industry-wide conference, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems, including drop-on-demand ink jet, wide format ink jet, desktop and continuous ink jet, toner-based electrophotographic printers, production digital printing systems, and thermal printing systems, as well as the engineering capability, optimization, and science involved in these fields.

    Since 2005, NIP has been held in conjunction with the Digital Fabrication Conference.

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