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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.

Document Type: Research Article

Publication date: January 1, 2007

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  • 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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