Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1991-12-19
1993-07-27
Britton, Howard W.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358 12, 358 13, 358138, 358310, 358312, 358335, H04N 7133, H04N 980, H04N 592
Patent
active
052314871
ABSTRACT:
Apparatus for storing a video signal includes a signal compression arrangement constituted by a spatial two-dimensional sub-band filtering arrangement that filters a digital video signal to form data sets constituting respective sub-bands of the two-dimensional spatial frequency domain, a quantizer that quantizes the data sets in accordance with respective values which are such that the amount of quantization of one of the data sets constituting a sub-band to which dc luminance information of the signal is at least predominantly confined is less than the average of the amounts of quantization of the remaining data sets, and an entropy encoder that selectively encodes at least some of the quantized data sets so that the quantized data sets, as selectively entropy encoded, form a compressed video signal. The signal compression arrangement is followed by a storage arrangement for storing the compressed video signal.
REFERENCES:
patent: 4780761 (1988-10-01), Daly
patent: 4969040 (1990-11-01), Gharavi
patent: 5049992 (1991-09-01), Citta
patent: 5136391 (1992-08-01), Minami
Proceedings ICASSP 1989, vol. 3, May 23-26, 1989, IEEE New York, US, pp. 1945-1948, R. Safranek et al.: A Perceptually tuned Sub-Band Coder With Image Dependent Quantization and Post-Quantization Data Compression.
Optical Engineering vol. 27, No. 7, Jul. 1988, Bellingham US pp. 574-586; G. Karlsson et al.: Subband Coding of Video For Packet Networks see paragraph 3-paragraph 42; FIG. 4-8.
Signal Processing Image Communication vol. 2, No. 3, Oct. 1990, Amsterdam, NL pp. 333-341; K. Irie et al.: Adaptive Sub-band DCT coding for HDTV Signal Transmission see paragraph 2; FIG. 1-4; tables 1-4.
IEEE Transactions on Communications. vol. COM34, No. 3, Mar. 1986, New York US pp. 310-319--see code 4, p. 316; E. Dubois et al.: Encoding and Progressive Transmission of Still Pictures in NTSC Composite Format Using Transform Domain Methods.
Hurley Terence R.
Stone Jonathan J.
Wilkinson James H.
Britton Howard W.
Frommer William S.
Sinderbrand Alvin
Sony Broadcast & Communications Ltd.
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