Data compression using orthogonal transform and vector quantizat

Details Data compression using orthogonal transform and vector quantizat Data compression using orthogonal transform and vector quantizat

1987-10-30

1989-07-25

Britton, Howard W.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358105, 358136, H04N 7133, H04N 7137

Patent

active

048519065

ABSTRACT:
In an image communication system, an input image sequence is converted into a block-formatted sequence. A data compression signal indicative of the amount of moving blocks in the block-formatted sequence is generated to individually control a plurality of vector quantizers each having a particular frequency band and a memory containing output vectors. The output vectors of each of the vector quantizers is representative of inverse orthogonal transform of a code table of optimum quantized vectors in the particular frequency band, the optimum quantized vectors being orthogonal transform of interframe differential training image sequences. The output vectors is retrievable from the memory as a function of an interframe differential image sequence, or prediction error. Each vector quantizer selects one of the vectors retrieved from the memory which is nearest to the value of the interframe differential image sequence and generates an index signal representative of the selected vector, which index signal is encoded and transmitted to a destination. The outputs of the vector quantizers are processed by inverse vector quantizers to generate a predictive image sequence. The prediction error is detected as a difference between the predictive image sequence and the block-formatted sequence.

REFERENCES:
patent: 4447886 (1984-05-01), Meeker
patent: 4541012 (1985-09-01), Tescher
patent: 4751742 (1988-06-01), Meeker

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