Facsimile and static presentation processing – Facsimile – Recording apparatus
Patent
1981-03-16
1982-12-07
Masinick, Michael A.
Facsimile and static presentation processing
Facsimile
Recording apparatus
340347DD, 364515, H04N 712
Patent
active
043630367
ABSTRACT:
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 respective 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.
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"Twodimensional Facsimile Source Encoding Based on a Markov Model", by Dieter Preub, NTZ-Aufsatze, pp. 358-363.
"Image Data Compression by Predictive Coding I: Prediction Image Data Compression Algorithms", by H. Kobayashi and L. R. Bahl, Mar. 1974, pp. 164-171.
"Some Extensions of the Ordering Techniques for Compression of Two-Level Facsimile Pictures", by F. W. Mounts, A. N. Netravali, and K. A. Walsh, Bell System Tech. Journal, Oct. 1978, pp. 3057-3067.
Cavender J. T.
Coles Sr. Edward L.
Masinick Michael A.
NCR Canada Ltd - NCR Canada Ltee
Sessler Jr. Albert L.
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