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Descreening printer-ready images

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In this paper we address the problem of taking a bilevel image prepared for one printer, and processing it such that when it is printed on a second printer, the outputs of the two printers are as visually similar as possible. We present novel algorithms for this processing, which includes descreening and rehalftoning. The potential application for this algorithm is the printing of a digital image on a printer that is different from the one the image was originally formatted ror.

Our algorithm segments the image into text and halftone areas based on gradient density. The halftone areas are analyzed through their Fourier power spectra to yield their repetitive frequencies. A smoothing filter is chosen based on the repetitive frequency to perform descreening. This results in an intermediate gray level image, which is then rehalftoned using a technique suitable for the second printer.

We implemented this algorithm, and found that it works satisfactorily on several test images.

Document Type: Research Article

Publication date: January 1, 1998

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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