Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-10-15
1994-07-26
Evans, Arthur G.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358448, 382 50, G06F 1562
Patent
active
053332628
ABSTRACT:
Disclosed is an image processing system which relies upon quantization and dithering techniques to enable an output device, which has a given number of output levels, to accurately reproduce a image which is generated by an input device, which has a greater or equal number of input levels. Generally, neither the number of input nor output levels need to be a power of two. The present invention is implemented in a number of different embodiments. These embodiments generally rely upon an image processor which, depending on the particular implementation, includes memory devices and an adder, a comparator, or a bit shifter. Additional embodiments use an image adjustment system to refine the raw input levels of the input device, in order to create an improved output image. Also, the particular embodiments of the image processors can be used in connection with imaging systems having bi-tonal, monochromatic, or color input and output devices.
REFERENCES:
patent: H996 (1991-11-01), McWaters et al.
patent: 4835599 (1989-05-01), Sigel
patent: 4975786 (1990-12-01), Katoyana et al.
patent: 4978861 (1990-12-01), Fujimoto
patent: 5014333 (1991-05-01), Miller et al.
patent: 5130701 (1992-07-01), White et al.
patent: 5170152 (1992-12-01), Taylor
Stuart C. Wells, Grant J. Williamson, Susan E. Carrie, "Dithering for 12-Bit-True-Color Graphics", IEEE Computer Graphics & Applications Sep. 1991 pp. 18-29.
Frattarola, G. and S. Edelson "Images as Opcodes", Edsun Laboratories 1990 pp. 1-14.
Glass, L. B., "Digital Video Interactive", May 1989 pp. 283-289.
Luther, Arch Digital Video in the PC Environment, New York: Intertext Publications, McGraw-Hill 1989 pp. 192-195.
Sigel, C., R. Abruzzi, J. Munson "Chromatic Subsampling for Display of Color Images", Digital Equipment Corporation Albuquerque, N.M. 1989 pp. 158-161.
Wan, S. J., K. M. Wong, and P. Prunsinkiewicz "An Algorithm for Multidimensional Data Clustering" ACM Trans. on Math. Software Jun. 1988 vol. 14, No. 2, pp. 153-162.
Heckbert, P. S. "Color Image Quantization for Frame Buffer Display", Computer Graphics Jul. 1982 vol. 16, No. 3, pp. 297-307.
Ulichney, R. Digital Halftoning, MIT Press 1987 Ch, 6&8, pp. 340 & 341.
Ulichney, R. "Imaging System with Two Level Dithering Using Comparator", Oct. 1992 176 pages Ser. No. 961,573.
Ulichney, R., Bahl, P. "Imaging System With Multilevel Dithering Using Single Memory", Oct. 1992 181 pages. 961,604.
Ulichney, R. "Imaging System With Multilevel Dithering Using Bit Shifter", Oct. 1992 179 pages 961,601.
Ulichney, R. "Imaging System With Image Adjustment System", Oct. 1992 180 pages 961,558.
Ulichney, R. "Void and Cluster Apparatus and Method for Creating Dither Templates", Oct. 1992 961,244.
Lawrence Gilman Roberts "Picture Coding Using Pseudo-Random Noise", IRE Transactions on Information Theory Feb. 1962 pp. 145-154.
Cefalo Albert P.
Evans Arthur G.
Hudgens Ronald C.
Tung Kee M.
Young Barry N.
LandOfFree
Imaging system with multilevel dithering using two memories does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Imaging system with multilevel dithering using two memories, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Imaging system with multilevel dithering using two memories will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1057581