Compression of gray scale imagery to less than one bit per...

Details Compression of gray scale imagery to less than one bit per... Compression of gray scale imagery to less than one bit per...

H - Electricity

04

N

354/69

H04N 7/32 (2006.01) G06T 9/00 (2006.01)

Patent

CA 1064618

COMPRESSION OF GRAY SCALE IMAGERY TO LESS THAN ONE BIT PER PICTURE ELEMENT Abstract of the Disclosure In a continuous tone image approximated by a two-dimensional array of gray scale coded points, more than one bit per picture ele- ment is required. Compression coding consists firstly of delta coding sequences representative of the successive scan lines of the continuous tone image and secondly applying them to a predictive encoder having a particular transfer function and thirdly run-length encoding the error image. Central to the invention is the observation that delta coded sequences of gray scale pel values along a given scan line have a high expectancy of alternating, i.e. 101010. Also, the gray scale trend in the ith scan line is expected to be the same as the trend of the ith - 1 scan line. Relatedly, gray scale image expansion is achieved by applying the compressed image to a run-length decoder, a predictor stage, and delta decoder.

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