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Pulse-Width Modulation for Rendering Color Text and Graphics for Laser Printers

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We present techniques for rendering high-quality color text and graphics on a laser printer using pulse-width modulation (PWM). Multilevel tones for these printers are generated using a combination of screening and pulse-width modulation signals that switch a laser source to render an image on an electrically-charged surface.

In the past, PWM techniques have been used to improve the rendering of text/graphics in saturated primary tones, however, rendering gray or arbitrary colors using these techniques typically leads to noisy text/graphics boundaries, primarily due to the inability of a laser printer to print weak or isolated pulses at the boundaries.

In this paper, rendering of all graphics/text tones is achieved by using a fast chain-code lookup table to determine the antialiasing required at a given pixel location. This table is precomputed using a wavelet-based boundary denoising algorithm. We present two techniques that use the antialiasing information to modify the output of the screening algorithm in order to generate pulse patterns that improve the stability of rendering at text/graphics boundaries. The presented techniques lead to superior text/graphics quality and smooth boundaries.

Document Type: Research Article

Publication date: January 1, 2002

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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