Communications: electrical – Audible indication – Percussion-type sound producer
Patent
1974-12-30
1977-01-25
Miller, Charles D.
Communications: electrical
Audible indication
Percussion-type sound producer
178DIG3, 325 38B, H03K 1322
Patent
active
040054110
ABSTRACT:
In a continuous tone image approximated by a two-dimensional array of gray scale coded points, more than one bit per picture element 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 having 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.
REFERENCES:
patent: 3569834 (1971-03-01), DeBart
patent: 3679821 (1972-07-01), Schroeder
patent: 3689840 (1972-09-01), Brown et al.
patent: 3720786 (1973-03-01), Cutler
patent: 3769451 (1973-10-01), Connor
Def. Pub.: T928,003, Bahl et al., Nov. 5, 1974.
Brodie R. Bruce
International Business Machines - Corporation
Miller Charles D.
Schmid, Jr. Otto
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