Method and apparatus for compressing digital still picture signa

Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry

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358448, 358426, 358430, 358433, 358443, 358404, 358444, H04N 1387

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active

052628787

ABSTRACT:
Digital still picture signals are processed for compression. A picture signal is divided into successive blocks containing data corresponding to different portions of a still picture. A selected block for the still picture is compared to an area of the picture defined by a plurality of previous blocks to try to locate a set of data in the area that is similar to the selected block. An error signal is generated that indicates the difference between the selected block and the best fit block of previously received data for the picture. Both the error signal and the current block are compressed. The amount of data in the compressed error signal is compared to the amount of data in the compressed current block to determine which provides the least amount of data for communication to a data receiver. An offset vector is appended to each selected error signal to identify the portion of the previously received picture data in which the corresponding best fit block resides. A data receiver recovers the digital still picture data by applying the offset vector for each received compressed error signal to a previously received area of the still picture data to recover the best fit block required to recreate the current data set from the received error signal.

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