Jun Yamashita, Hisato Sekine, Toshiya Nakaguchi, Norimichi Tsumura, Yoichi
Miyake
*Department of Information-Science, Graduate
School of Science and Technology, Chiba University
1-33, Yayoi-cho, Inage-ku, Chiba, 263-8522,
Japan
Journal of The Society of Photographic Science and Technology of Japan, Vol. 66 No. 5, 458-463(2003).
Abstract
We propose a new model to predict the color reproduction of digital halftone
image based on the physical model of dot gain. In the previous papers,
we reported that the transparency image of halftone is not influenced by
optical dot gain. On the basis of this experimental result, in this paper
we analyze the optical and mechanical dot gain separately by using the
optical microscopes which can take the transparency and reflectance images
of the same area. Transparency images of an ink dot are taken with an optical
microscope with a six-band camera and the spectral transmittance of each
pixel in an ink dot is estimated by the multiple regression estimation
method. This obtained spectral transmittance is converted into the amount
of cyan, magenta, and yellow (c,m,y) inks in each pixel. Then we can estimate
the shape of ink dot by polynomial fitting of ink amount. The transmittance
of c,m,y inks of printed images is estimated by using the proposed method
and compared with that of practical printed images. This results show that
the proposed method is significant to predict the density of ink-jet images.
Full paper ( to appeare )
[PDF](in Japanese)