Image data compression and decompression using both a fixed leng

Details Image data compression and decompression using both a fixed leng Image data compression and decompression using both a fixed leng

1997-07-31

1999-09-21

Au, Amelia

Image analysis

Image compression or coding

Lossless compression

382233, 382250, 382251, 3582611, 348403, 341 63, 386109, G06K 936, G06K 946

Patent

active

059564296

ABSTRACT:
Image data decompression apparatus and method for receiving data words comprising a first sub-word and a second sub-word, at least some possible values of the first sub-word specifying a run of at least m instances of a predetermined data value, corresponding second sub-words specifying a number of instances of the predetermined data value in a range from at least m instances. The apparatus includes a first decoder for decoding the first sub-words to detect whether a current first sub-word specifies a run of at least m instances of the predetermined value, and a second decoder for decoding the second sub-words to generate output decoded data. The apparatus also includes a data counter for counting output decoded data from the second decoder, an adder, responsive to detection of a data error in a current second sub-word, for adding to a count of the data counter an amount corresponding to a lowest number m of instances of the predetermined data value specified by the corresponding first sub-word, and a partial code detector, responsive to a second sub-word having only a portion thereof corrupted by an error therein for detecting the number of instances of the predetermined data value more than the number of instances specified by the first sub-word indicated by an uncorrupted portion thereof, and for controlling the adder to add to the count of the data counter the number of instances specified by the uncorrupted portion of the second sub-word.

REFERENCES:
patent: 5488418 (1996-01-01), Mishima et al.
patent: 5606421 (1997-02-01), Suzuki et al.

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