Video interframe transform coding technique

Details Video interframe transform coding technique Video interframe transform coding technique

1980-05-02

1981-07-28

Martin, John C.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

H04N 712

Patent

active

042813441

ABSTRACT:
The efficiency with which a video signal is encoded is increased by examining successive blocks of M picture elements to determine which K pels have frame differences which do not exceed a predetermined threshold. The values of these K pels are intentionally altered, and the pels are applied to a transform circuit which generates N.ltoreq.M corresponding coefficient values. Only N-K of the coefficient values, and a code indicating the unchanged pel locations are then encoded for transmission. The decoder (and the feedback loop of the encoder) is arranged to recover the original picture using only the frame differences for pels which have changed significantly.

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patent: 4133006 (1979-01-01), Iinuma
patent: 4202011 (1980-05-01), Koga
patent: 4215374 (1980-07-01), Mizumo
H. W. Jones, "A Real-Time Adaptive Hadamard Transform Video Compressor," 1976, S.P.I.E., vol. 87, Advances in Image Transmission Techniques, pp. 2-9.
H. W. Jones, "A Conditional Replenishment Hadamard Video Compressor," 1977 S.P.I.E., vol. 119, Application Digital Image Processing, pp. 91-98.
J. A. Roese, "Intraframe Coding of Digital Images Using Transform and Hybrid Transform/Predictive Techniques," USCIPI Report 700, 6-1976.
S. C. Noble et al., "A Real-Time Hadamard Transform System for Spatial and Temporal Redundancy Reduction in Television," 1973, Proc. of International Telemetering Conference.

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