The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
Copyrights notice
The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
Kualiti imej cetakan halftone sangat dipengaruhi oleh ciri optik kertas. Penyerakan cahaya dalam kertas menghasilkan perolehan titik optik, yang mempunyai pengaruh yang ketara pada ton dan warna semula cetakan halftone. Penyerakan cahaya boleh dikira dengan Fungsi Pemindahan Modulasi (MTF) kertas. Beberapa kaedah telah dicadangkan untuk mengukur MTF kertas. Walau bagaimanapun, kaedah ini mempunyai masalah dalam kecekapan atau ketepatan dalam pengukuran. Dalam artikel ini, kaedah baharu dicadangkan untuk mengukur MTF kertas dengan cekap dan tepat, dan kesan keuntungan titik pada cetakan halftone dianalisis. MTF dikira daripada nisbah dalam domain frekuensi spatial antara tindak balas cahaya pensel kejadian ke kertas dan pemantul spekular yang sempurna. Oleh kerana ciri frekuensi spatial cahaya pensel input boleh diperolehi daripada tindak balas pemantul spekular yang sempurna, ia tidak perlu menghasilkan pencahayaan input yang mempunyai ciri impuls "ideal". Kaedah kami adalah cekap secara eksperimen kerana hanya dua imej yang perlu diukur. Selain itu ia boleh mengukur dengan tepat kerana data boleh dianggarkan oleh model MTF konvensional. Seterusnya, kami meramalkan taburan pantulan cetakan halftone menggunakan MTF yang diukur dalam mikroskop untuk menganalisis kesan keuntungan titik kerana ia boleh diperhatikan dengan jelas dalam struktur mikro halftone. Akhir sekali, simulasi dijalankan untuk mengeluarkan kesan serakan cahaya daripada imej yang diramalkan. Memandangkan imej simulasi tidak dipengaruhi oleh keuntungan titik optik, ia boleh digunakan untuk menganalisis liputan titik sebenar.
Masayuki UKISHIMA
Hitomi KANEKO
Toshiya NAKAGUCHI
Norimichi TSUMURA
Markku HAUTA-KASARI
Jussi PARKKINEN
Yoichi MIYAKE
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Salinan
Masayuki UKISHIMA, Hitomi KANEKO, Toshiya NAKAGUCHI, Norimichi TSUMURA, Markku HAUTA-KASARI, Jussi PARKKINEN, Yoichi MIYAKE, "A Simple Method to Measure MTF of Paper and Its Application for Dot Gain Analysis" in IEICE TRANSACTIONS on Fundamentals,
vol. E92-A, no. 12, pp. 3328-3335, December 2009, doi: 10.1587/transfun.E92.A.3328.
Abstract: Image quality of halftone print is significantly influenced by optical characteristics of paper. Light scattering in paper produces optical dot gain, which has a significant influence on the tone and color reproductions of halftone print. The light scattering can be quantified by the Modulation Transfer Function (MTF) of paper. Several methods have been proposed to measure the MTF of paper. However, these methods have problems in efficiency or accuracy in the measurement. In this article, a new method is proposed to measure the MTF of paper efficiently and accurately, and the dot gain effect on halftone print is analyzed. The MTF is calculated from the ratio in spatial frequency domain between the responses of incident pencil light to paper and the perfect specular reflector. Since the spatial frequency characteristic of input pencil light can be obtained from the response of perfect specular reflector, it does not need to produce the input illuminant having "ideal" impulse characteristic. Our method is experimentally efficient since only two images need to be measured. Besides it can measure accurately since the data can be approximated by the conventional MTF model. Next, we predict the reflectance distribution of halftone print using the measured MTF in microscopy in order to analyze the dot gain effect since it can clearly be observed in halftone micro-structure. Finally, a simulation is carried out to remove the light scattering effect from the predicted image. Since the simulated image is not affected by the optical dot gain, it can be applied to analyze the real dot coverage.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E92.A.3328/_p
Salinan
@ARTICLE{e92-a_12_3328,
author={Masayuki UKISHIMA, Hitomi KANEKO, Toshiya NAKAGUCHI, Norimichi TSUMURA, Markku HAUTA-KASARI, Jussi PARKKINEN, Yoichi MIYAKE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Simple Method to Measure MTF of Paper and Its Application for Dot Gain Analysis},
year={2009},
volume={E92-A},
number={12},
pages={3328-3335},
abstract={Image quality of halftone print is significantly influenced by optical characteristics of paper. Light scattering in paper produces optical dot gain, which has a significant influence on the tone and color reproductions of halftone print. The light scattering can be quantified by the Modulation Transfer Function (MTF) of paper. Several methods have been proposed to measure the MTF of paper. However, these methods have problems in efficiency or accuracy in the measurement. In this article, a new method is proposed to measure the MTF of paper efficiently and accurately, and the dot gain effect on halftone print is analyzed. The MTF is calculated from the ratio in spatial frequency domain between the responses of incident pencil light to paper and the perfect specular reflector. Since the spatial frequency characteristic of input pencil light can be obtained from the response of perfect specular reflector, it does not need to produce the input illuminant having "ideal" impulse characteristic. Our method is experimentally efficient since only two images need to be measured. Besides it can measure accurately since the data can be approximated by the conventional MTF model. Next, we predict the reflectance distribution of halftone print using the measured MTF in microscopy in order to analyze the dot gain effect since it can clearly be observed in halftone micro-structure. Finally, a simulation is carried out to remove the light scattering effect from the predicted image. Since the simulated image is not affected by the optical dot gain, it can be applied to analyze the real dot coverage.},
keywords={},
doi={10.1587/transfun.E92.A.3328},
ISSN={1745-1337},
month={December},}
Salinan
TY - JOUR
TI - A Simple Method to Measure MTF of Paper and Its Application for Dot Gain Analysis
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 3328
EP - 3335
AU - Masayuki UKISHIMA
AU - Hitomi KANEKO
AU - Toshiya NAKAGUCHI
AU - Norimichi TSUMURA
AU - Markku HAUTA-KASARI
AU - Jussi PARKKINEN
AU - Yoichi MIYAKE
PY - 2009
DO - 10.1587/transfun.E92.A.3328
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E92-A
IS - 12
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - December 2009
AB - Image quality of halftone print is significantly influenced by optical characteristics of paper. Light scattering in paper produces optical dot gain, which has a significant influence on the tone and color reproductions of halftone print. The light scattering can be quantified by the Modulation Transfer Function (MTF) of paper. Several methods have been proposed to measure the MTF of paper. However, these methods have problems in efficiency or accuracy in the measurement. In this article, a new method is proposed to measure the MTF of paper efficiently and accurately, and the dot gain effect on halftone print is analyzed. The MTF is calculated from the ratio in spatial frequency domain between the responses of incident pencil light to paper and the perfect specular reflector. Since the spatial frequency characteristic of input pencil light can be obtained from the response of perfect specular reflector, it does not need to produce the input illuminant having "ideal" impulse characteristic. Our method is experimentally efficient since only two images need to be measured. Besides it can measure accurately since the data can be approximated by the conventional MTF model. Next, we predict the reflectance distribution of halftone print using the measured MTF in microscopy in order to analyze the dot gain effect since it can clearly be observed in halftone micro-structure. Finally, a simulation is carried out to remove the light scattering effect from the predicted image. Since the simulated image is not affected by the optical dot gain, it can be applied to analyze the real dot coverage.
ER -