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Detection of Monochrome Pages in Color Document Scans

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In this paper, we present an algorithm for detecting monochrome pages in a color copy job on a multi function printer (MFP) with a contact image sensor (CIS) based scanner. Once detected, a monochrome page can be processed as such, which can improve image quality, print speed, and save color-printing supplies. The presented algorithm processes the RGB color data captured with the CIS scan bar for a given scan band and keeps track of color information across all scan bands moving down the page. The colorfulness of every pixel in the scan bands is derived from the Cb and Cr channels after color conversion from the RGB to the YCbCr space. A pixel is classified as color if its colorfulness value is greater than a predetermined device and media specific threshold. This threshold is found by modeling the cumulative colorfulness histogram of a number of scanned test documents using a mixture of two Gaussian distributions and the Expectation Maximization (EM) algorithm. For every scan band, the highest concentration of color pixels is saved, and later used to classify the page content as either color or monochrome.

Document Type: Research Article

Publication date: 2009-01-01

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  • 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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