Picture signal coder

Details Picture signal coder Picture signal coder

1975-08-01

1976-10-05

Griffin, Robert L.

Telegraphy

Systems

Simplex-reversing periodic

178DIG3, 179 15BC, H04M 712

Patent

active

039846261

ABSTRACT:
In PCM and DPCM systems, a Hadamard orthogonal transformation of picture element signals is known to offer a means for reducing the bit rate for transmission of the signals. The first Hadamard coefficient, called H.sub.1, equals the sum of the picture element signals. Accordingly, still further reduction in the transmission bit rate can be achieved by efficiently coding H.sub.1. The disclosed coder includes a control signal generator for providing a control signal corresponding to a predetermined function of the quantized Hadamard coefficient signals. Several illustrative arrangements are disclosed. In three arrangements, the respective control signals are employed to adaptively select one of a plurality of quantizers, the selected quantizer for coding H.sub.1. In a fourth arrangement, the control signal is employed to predict H.sub.1, the predictor control signal being thereafter used for coding H.sub.1.

REFERENCES:
patent: 2724740 (1955-11-01), Cutler
M. Chow, "Variable-Length Redundancy Removal Coder for Differentially Coded Video Telephone Signals," IEEE Tran. Comm. Tech., vol. 19, No. 6,12-71.
W. K. Pratt et al, "Application of Fourier-Hadamard Transformation to Bandwidth Compression," Picture Bandwidth Compression, edited by T. S. Huang and O. J. Tretiak (New York: Gordon and Breach, Science Publishers, 1972), pp. 515-554.

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