Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1992-10-15
1996-04-16
Ip, Paul
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358455, 358456, H04N 140
Patent
active
055088228
ABSTRACT:
This invention relates to 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: 4975786 (1990-12-01), Katayama et al.
patent: 4975861 (1990-12-01), Fujimoto
patent: 5014333 (1991-05-01), Miller et al.
patent: 5075683 (1991-12-01), Ghis
patent: 5077615 (1991-12-01), Tsuji
patent: 5130701 (1992-07-01), White et al.
patent: 5170152 (1992-12-01), Taylor
patent: 5196924 (1993-03-01), Lumelsky et al.
patent: 5251046 (1993-10-01), Kato et al.
patent: 5268774 (1993-12-01), Eschbach
patent: 5291311 (1994-03-01), Miller
patent: 5317418 (1994-05-01), Lin
patent: 5353127 (1994-10-01), Shiau et al.
patent: 5361142 (1994-11-01), Semasa
patent: 5363219 (1994-11-01), Yoshida
patent: 5371515 (1994-12-01), Wells et al.
patent: 5377041 (1994-12-01), Spaulding et al.
Lawrence Gilman Roberts "Picture Coding Using Pseudo-Random Noise", IRE Transactions on Information Theory Feb. 1962 pp. 145-154.
Bahl Paramvir
Ulichney Robert A.
Digital Equipment Corporation
Fisher Arthur W.
Ip Paul
Maloney Denis G.
McGuinness Lindsay G.
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