Incremental printing of symbolic information – Ink jet – Controller
Reexamination Certificate
2007-08-07
2007-08-07
Nguyen, Thinh (Department: 2861)
Incremental printing of symbolic information
Ink jet
Controller
C347S015000
Reexamination Certificate
active
11256850
ABSTRACT:
The present invention proposes a method and a computing system for deducing ink thickness variations from spectral reflectance measurements performed on a printing press or on a printer. The computed ink thickness variations enable controlling the ink deposition and therefore the color accuracy, both in the case of high-speed printing presses and of network printers. Ink thickness variations are expressed as ink thickness variation factors incorporated into a spectral prediction model. The method for computing ink thickness variations comprises both calibration and ink thickness variation computation steps. The calibration steps comprise the calculation of ink transmittances from measured reflectances and the computation of possibly wavelength-dependent ink thicknesses of solid superposed inks. Wavelength-dependent ink thicknesses account for the scattering behavior of non-transparent inks or of inks partly entering into the paper bulk. The ink thickness variation factors are fitted by minimizing a distance metric between the reflection spectrum predicted according to the thickness variation enhanced spectral prediction model and the measured reflection spectrum. The ink thickness variation enhanced spectral prediction model can be applied both in the visible wavelength range and in the near-infrared wavelength range. This enables computing unambiguously the thickness variations of the cyan, magenta, yellow and black inks. Furthermore, a spectral reflection may be measured over a stripe of a printed page and used to predict the ink thickness variations occurring within that stripe. This enables the real-time control of the ink deposition process on a printing press.
REFERENCES:
patent: 4685139 (1987-08-01), Masuda et al.
patent: 4852485 (1989-08-01), Brunner
patent: 5357448 (1994-10-01), Stanford
patent: 6230622 (2001-05-01), Dilling
patent: 6314263 (2001-11-01), Yoshida et al.
patent: 7017492 (2006-03-01), Seymour
U.S. Appl. No. 10/631,743, filed Aug. 1, 2003, R. D. Hersch, P. Emmel, F. Collaud Prediction model for color separation, calibration and control of printers.
U.S. Appl. No. 10/698,667, filed Oct. 31, 2003, Staelin et al. Inks Thickness Consistency in Digital Printing Presses.
U.S. Appl. No. 10/186,590, filed Jul. 1, 2002, Riepenhoff Measurement and regulation of inking in web printing.
F.R. Clapper, J.A.C Yule, “The effect of multiple internal reflections on the densities of halftone prints on paper”, Journal of the Optical Society of America, vol. 43, 1953, 600-603.
R.D. Hersch, et. al., “Spectral reflection and dot surface prediction models for color halftone prints”, Journal of Electronic Imaging, vol. 14, No. 3, Aug. 2005, pp. 33001-33012.
R.D. Hersch, et. al., Spectral prediction and dot surface estimation models for halftone prints, SPIE vol. 5293, Jan. 2004, pp. 356-369.
R.D Hersch and al, “Improving the Yule-Nielsen modified spectral Neugebauer model by dot surface coverages depending on the ink superposition conditions”, IS&T/SPIE Electronic Imaging Symposium, Conf. Imaging X: Processing, Hardcopy and Applications, Jan. 2005, SPIE vol. 5667, pp. 434-445.
H. Kipphan, Handbook of Print Media, Springer-Verlag, 2001, pp. 103-105.
G. Rogers, “A Generalized Clapper-Yule Model of Halftone Reflectance”, Journal of Color Research and Application, vol. 25, No. 6, pp. 402-407 (2000).
Amrhyn Peter
Hersch Roger D.
Riepenhoff Matthias
Ecole polytechnique fédérale de Lausanne (EPFL)
Nguyen Thinh
LandOfFree
Ink thickness variations for the control of color printers does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Ink thickness variations for the control of color printers, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Ink thickness variations for the control of color printers will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3858830