Line-sequential pyramid processing of a plurality of raster-scan

Details Line-sequential pyramid processing of a plurality of raster-scan Line-sequential pyramid processing of a plurality of raster-scan

1988-05-06

1991-01-01

Kostak, Victor R.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358160, 382 49, H04N 712

Patent

active

049822837

ABSTRACT:
A plurality of raster-scanned image variables are time-compressed and time-division multiplexed on a line-sequential basis for pyramid analysis. The resulting differential pulse code modulation is statistically encoded and assembled together with digital audio code and synchronizing code. The assembler supplies a serial stream of bits to a transmitter. Receiving apparatus for a video teleconferencing station includes a receiver complementary to the transmitter and a parser for separating digital codewords. Those codewords that are statistical codes descriptive of differential pulse code modulation of video are demodulated. The demodulation results are formatted for a pyramid synthesizer. The stream of samples provided as output signal from the pyramid synthesizer is time-division demultiplexed and time expanded to recover the plurality of raster-scanned image variables.

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A. H. Tan, K-M. Liu, K-H. Tzou & E. B. Vogel, "An Efficient Pyramid Image Coding System": Proceedings ICASSP 87, vol. 2, pp. 18.6.1-186.6.4.

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