Adaptive process for the coding and decoding of a sequence of pi

Details Adaptive process for the coding and decoding of a sequence of pi Adaptive process for the coding and decoding of a sequence of pi

1985-12-23

1987-11-17

Masinick, Michael A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358136, 358138, H04N 712

Patent

active

047077387

ABSTRACT:
This process uses a bidirectional transformation by blocks for images representing highly animated scenes and also uses a differential coding of the transformation coefficients when the pictures show slightly animated scenes. The coding device mainly comprises a cosine transformation device, a subtractor, and inter-image decoding device, a multiplexer, a device for discriminating the blocks showing highly animated scenes and blocks showing slightly animated scenes. The latter device controls the multiplexer. The subtractor and the decoding device make it possible to calculate the difference between each transformation coefficient and the homologous coefficient of the homologous block in the preceding picture. Moreover, a weighting device makes it possible to transmit with a larger number of bits the coefficients or coefficient differences corresponding to the low spatial frequencies of the images.

REFERENCES:
patent: 3761613 (1973-09-01), Limb
patent: 4196448 (1980-04-01), Whitehouse
patent: 4217609 (1980-08-01), Hatori et al.
patent: 4245248 (1981-01-01), Netravali et al.
patent: 4394774 (1983-07-01), Widergren et al.
patent: 4581638 (1986-04-01), Chiariglione
patent: 4583114 (1986-04-01), Catros
patent: 4613894 (1986-09-01), Catros
The Bell System Journal, vol. 58, No. 7, Sep. 1979, pp. 1703-1717.
International Conference on Communications, Conference Record, vol. 2 of 4, Jun. 14-18, 1981, pp. 22.5.1-22.5.6.

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