Adaptive facsimile compression using a dynamic extendable decisi

Details Adaptive facsimile compression using a dynamic extendable decisi Adaptive facsimile compression using a dynamic extendable decisi

1982-06-28

1985-02-12

Boudreau, Leo H.

Image analysis

Histogram processing

For setting a threshold

358260, 382 15, G06K 962

Patent

active

044995962

ABSTRACT:
Preliminary classification of a text character by examining a few of its PELs rather than requiring repeated comparisons of the entire pattern with a large set of prototypes is achieved by following a path through a decision tree in a root-to-leaf node direction. Each tree node specifies the location of a PEL in the character and the input pattern PEL value in turn determines the next branch to follow in the tree. The root node identifies the first PEL to be inspected while the final leaf indicates the class selected. The library pattern and inputs are compared. Upon match, an index number is generated and the next pattern processed. Upon a mismatch, the pattern will be registered as a new prototype in the library, the tree extended to include the new class, and the next pattern will be processed.

REFERENCES:
patent: 3226689 (1965-12-01), Amdahl et al.
patent: 3333248 (1967-07-01), Greenberg et al.
patent: 4181952 (1980-01-01), Casey et al.
Naylor, "Interactive Design of Character-Recognition Logics", Disclosure Document No. T980,008, Mar. 6, 1979.
"Automatic Generation of OCR Logic from Scanned Characters", R. G. Casey, IBM TDB vol. 22, No. 3, Aug. 1979, pp. 1189-1190.
"Two-Level Character Recognition Logic", R. D. Goddard et al, IBM TDB vol. 22, No. 10, Mar. 1980, pp. 4429-4430.
"Means for Achieving a High Degree of Compaction on Scan-Digitized Printed Text", R. N. Ascher et al, IEEE Trans. on Computers vol. C23, No. 1, 11 11/74.

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