Method for encoding and decoding a digital image

Details Method for encoding and decoding a digital image Method for encoding and decoding a digital image

Filed on

1987-10-21

Date issued

1989-12-19

Examiner

Coles, Sr., Edward L.

Patent Class

Facsimile and static presentation processing

SubClass

Facsimile

SubSubClass

Recording apparatus

Other Related Categories

3582613, H04N 712

Type

Patent

Status

active

Patent number

048886459

Description

ABSTRACT:
A method for encoding and decoding digital image data, includes the steps of: testing the data for a vertical relationship between adjacent lines of the image; generating directly a reference code word representative of the vertical relationship for each successful test; generating by table lookup a run code word for a stream of data bits of common value for each unsuccessful test whereby a data element representing a number of bits in a code word is stored at a predetermined offset from a table entry for the code word; merging the vertical reference code words and the run code words generated by the above steps to form an encoded data stream; testing the encoded data stream for a reference code; decoding directly the vertical relationship from the reference code for each successful test; decoding by table lookup a run of bits of common value by serial examination of said encoded data stream for each unsuccessful test; and storing data decoded by the above steps in a predetermined relationship. A fast algorithm for modifying an image in run representation form before encoding or after decoding is also described.

REFERENCES:
patent: 4212036 (1980-07-01), Nakagome et al.
patent: 4558371 (1985-12-01), Rallapalli

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