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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.
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Document Type: Research Article

Publication date: 2002-01-01

More about this publication?
  • For more than 30 years, IS&T's series of digital printing conferences have been the leading forum for discussion of advances and new directions in 2D and 3D printing technologies. A comprehensive, industry-wide conference that brings together industry and academia, this meeting includes all aspects of the hardware, materials, software, images, and applications associated with digital printing systems?particularly those involved with additive manufacturing and fabrication?including bio-printing, printed electronics, page-wide, drop-on-demand, desktop and continuous ink jet, toner-based systems, and production digital printing, as well as the engineering capability, optimization, and science involved in these fields. In 2016, the conference changed its name formally to Printing for Fabrication to better reflect the content of the meeting and the evolving technology of printing.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual paper for details.

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