Image analysis – Histogram processing – For setting a threshold
Patent
1990-08-09
1992-08-11
Boudreau, Leo H.
Image analysis
Histogram processing
For setting a threshold
3582612, 358427, 358432, G06K 900
Patent
active
051386739
ABSTRACT:
A data compression system is provided having a fixed length coding unit provided before a universal coding unit. The fixed length coding unit detects mode classifications and mode conditions of changing picture elements in a mode detecting unit. Then, the mode classifications and mode conditions are converted to fixed length code words in a code transforming unit representative of, e.g., MH, MR or MMR-type codes. Thereafter, the fixed length code words are predictively coded by the universal coding unit to output compressed data. The present invention is applicable to both character data and picture data. Preferably, the picture data is preprocessed by the fixed length coding unit before both of the character data and picture data are predictively coded by the universal coding unit.
REFERENCES:
patent: 4688100 (1987-08-01), Haganuma et al.
patent: 4800441 (1989-01-01), Sato
patent: 4819079 (1989-04-01), Takao
"Highly Efficient Data Compression Method for Newspaper Image Data" by Atsushi Ishii et al., Fujitsu Sci. Tech. J. 18, 2, pp. 199-225, Jun. 1982.
Computer, "A Technique For High-Performance Data Compression" by Terry A. Welch, Sperry Research Center, 1984 IEEE.
IEEE Transactions of Communications, vol. COM-34, No. 12, Dec. 1986 "Better OPM/L Text Compression" by Timothy C. Bell.
"Compression of Black-White Images with Arithmetic Coding" 1981 IEEE by Glen G. Langdon, Jr., Senior Member, IEEE, and Jorma Rissanen.
Chiba Hirotaka
Mori Masahiro
Nakano Yasuhiko
Okada Yoshiyuki
Yoshida Shigeru
Boudreau Leo H.
Fujitsu Limited
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