H - Electricity – 04 – N
Patent
H - Electricity
04
N
350/33, 354/68
H04N 7/12 (2006.01) G06T 9/00 (2006.01) H03M 7/42 (2006.01) H04N 1/417 (2006.01)
Patent
CA 1173150
METHOD AND APPARATUS FOR COMPRESSING DIGITAL DATA USING NON-ADAPTIVE PREDICTIVE TECHNIQUES Abstract of the Disclosure A method and apparatus for compressing digital data derived from an image using non-adaptive predictive techniques. A prediction table, which is pre-generated based on a number of sample images, generates a predicted pixel and source state for each pixel of the original image, as the original image is scanned. The predicted pixel is the expected value of the pixel when considering the values of a group of adjoining pixels, while the source state is indicative of the probability that the predicted pixel is in error. Prediction error pixels are then generated and grouped according to their respec- tive source states to form a plurality of run length symbols with each symbol comprising a white portion and a black portion, which symbols are stored sequentially in order of formation in a memory device according to their respective source states. The symbols are used to provide address data for memory devices which generate variable length code words that are transmitted to a receiving station and decoded using the reverse of the aforementioned process to form a facsimile image.
398200
Ncr Canada Ltd. - Ncr Canada Ltee
Smart & Biggar
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