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

1986-03-19

1988-02-16

Coles, Sr., Edward L.

Communications: electrical

Audible indication

Percussion-type sound producer

358261, H03M 748

Patent

active

047258152

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: 4156880 (1979-05-01), Yamada
patent: 4297727 (1981-10-01), Ogawa
patent: 4684923 (1987-08-01), Koga

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