Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1986-09-10
1988-12-27
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358260, H04N 1417, H04N 1411, H04N 1413
Patent
active
047944617
ABSTRACT:
A method and apparatus for improving the performance of data compression processes, such as relative address coding, CCITT standard facsimile processes, and similar two-dimensional image coding processes, by block coding one or more of the vertical mode codes produced by these processes. The performance of data compression processes is improved by representing one or more sequences of vertical mode code words with a single block code word. A reference scan line is preferably selected from among a plurality of previous scan lines, for example, the immediately preceding ten scan lines, for two-dimensional image coding. The previous scan line which is most similar to the current scan line to be coded is selected as the reference scan line. The selected reference scan line is then fed with the current scan line to be coded to a two-dimensional data compression coding process so as to yield a first tier of data compression. The image data are preferably checked during the two-dimensional data compression coding process for a predetermined run of a given vertical mode code, and a preselected block code is substituted if the predetermined run of the given vertical mode code appears so as to yield a second tier of data compression. Preferably, eleven consecutive vertical offset zero code words are represented by a single block code word. This provides enhanced data compression and reduces the amount of image data stored or transmitted and concomitantly lowers the cost for operation of the image data storage or transmission apparatus.
REFERENCES:
patent: 4144547 (1979-03-01), Stoffel
patent: 4215375 (1980-07-01), Usubuchi et al.
patent: 4399467 (1983-08-01), Subramaniam
patent: 4425582 (1984-01-01), Kadakia et al.
patent: 4511213 (1985-04-01), Yamazaki et al.
patent: 4559563 (1985-12-01), Joiner, Jr.
patent: 4571634 (1986-02-01), Caneschi et al.
patent: 4631521 (1986-12-01), El-Sherbini
patent: 4633325 (1986-12-01), Usubuchi
patent: 4667251 (1987-05-01), Hasegawa
patent: 4673987 (1987-06-01), Toyokawa
patent: 4729034 (1988-03-01), Roberts et al.
Usubuchi, Touro, et al., "Adaptive Predictive Coding for Newspaper Facsimile", Proceedings of the IEEE, vol. 68, No. 7, Jul. 1980, pp. 807-813.
Johnsen, O., "A New Code for Transmission of Ordered Dither Pictures", The Bell System Technical Journal, vol. 60, No. 3, Mar. 1981, pp. 379-389.
Johnsen, O., et al., "An Extension of the CCITT Facsimile Codes for Dithered Pictures", The Bell System Technical Journal, vol. 60, No. 3, Mar. 1981, pp. 391-404.
Liao, Henry H., "Adaptive Predictor for Halftone or Line Graphics", Xerox Disclosure Journal, vol. 6, No. 5, Sep./Oct. 1981, pp. 281-282.
Drain Fredrick L.
Henderson Alex E.
Roberts Lawrence G.
Groody James J.
NetExpress Systems, Inc.
Svihla Randall S.
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