Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1985-06-27
1988-03-01
Groody, James J.
Facsimile and static presentation processing
Facsimile
Recording apparatus
358133, 358135, 358260, H04N 1419, H04N 1413, H04N 712
Patent
active
047290340
ABSTRACT:
A method and apparatus for selecting a reference scan line for two-dimensional image coding preferably compatible with known facsimile transmission equipment are disclosed. Selection of a reference scan line in accordance with the method and apparatus of the invention allows data compression for facsimile transmission so that the cost for use of the communication link is reduced. More than one previous scan line is considered as a candidate reference scan line. A reference scan line is selected from among a plurality of previous scan lines, for example, the immediately preceding ten scan lines. The preselected or adaptively selected scan line among the multiple prior scan lines, more particularly, the previous scan line which is most similar to the current scan line to be coded, is selected as the reference scan line. The 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 optimum data compression. This reduces the amount of image data transmitted and lowers the cost of operation of the facsimile transmission apparatus. The method and apparatus are particularly effective for compressing image data representing screened pictorial images.
REFERENCES:
patent: 4144547 (1979-03-01), Stoffel
patent: 4215375 (1980-07-01), Usubuchi et al.
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
"Standardization of Group 3 Facsimile Apparatus for Document Transmission", CCITT Recommendation T.4, Geneva, 1980, pp. 222-234.
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 Dithered 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 Haltone or Line Graphics", Xerox Disclosure Journal, vol. 6, No. 5, Sep./Oct. 1981, pp. 281-282.
Henderson Alex E.
Roberts Lawrence G.
Groody James J.
NetExpress Systems, Inc.
Svihla Randall S.
LandOfFree
Method and apparatus for selection of a coding reference line fo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for selection of a coding reference line fo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for selection of a coding reference line fo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1002397