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New High-resolution Technique of Image Reading Using LMSType Spectrum Filter

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This paper proposes a new technique of image reading for printed material using a one-chip image sensor that enables high resolution and solves the problem of false colors around pattern edges. To achieve this, the technique adopts a novel method that produces a color component value of a pixel that is not sampled based on the supposition that there is only one color dot in the background color of printed matter in small areas such as the aperture areas of the pixels of the image sensor. Based on this supposition, we derive the linear relationship between the color component and luminance in such small areas. In addition to using this linear relationship, using a color filter with a wide band transmission spectrum also contributes to achieving high resolution with this technique. We conducted a simulation where we used an LMS-type color filter as a wideband spectrum filter. The results from the simulation demonstrated the effectiveness of this method indicating that we could obtain high resolution for all color component signals as high that of a 3-chip color image sensor and it could improve color reproductivity around pattern edges.

Document Type: Research Article

Publication date: January 1, 2012

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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