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Efficient and Accurate MTF Measurement for Spatially Nonuniform Paper

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The conventional Koopipat's method was modified to measure the modulation transfer function (MTF) of spatially nonuniform paper. First, we analyzed and removed the non-uniform characteristic caused by the fiber structure of paper. Secondly, in order to calculate the paper MTF, the edge spread function (ESF) was analyzed using the edge part of a neutral density (ND) filter superposed on paper. A microscope which can illuminate paper from front or back side was used to measure the ESF. Gans' method was used to calculate the Fourier transform of ESF. MTFs were measured for three types of paper: uncoated paper, coated paper and glossy paper, whose graininess levels are high, normal and low, respectively. As a result of the experiment, regardless of graininess level, the MTFs were measured efficiently and accurately. The measured MTF was applied to predict reflectance distribution of monochrome inkjet images from transmittance distribution. We conclude that our method is effective to simulate inkjet printing since the RMSE and difference of average reflectance between the measured and predicted data were low.
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Document Type: Research Article

Publication date: 2007-01-01

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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.

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