Facsimile and static presentation processing – Facsimile – Specific signal processing circuitry
Patent
1985-08-13
1987-07-28
Groody, James J.
Facsimile and static presentation processing
Facsimile
Specific signal processing circuitry
358135, H04N 712
Patent
active
046834940
ABSTRACT:
A video coding apparatus having a quantizer that is controlled by a quantization control signal. Stationary picture elements are coded such that quantization is coarse, which reduces the output information for the picture elements in the stationary image region and increases compression of the signal. The apparatus may include a calculation system for calculating a distance of a stationary picture element from the moving image region. The quantization is performed more coarsely as the calculated distance becomes longer. The quantizer may also be controlled such that coarse quantization is performed over a plurality of frames for the picture elements in the stationary region, and at a predetermined interval finer quantization is performed with respect to the same stationary picture elements, for further improving the picture. Transition of a picture element from the stationary region to the moving region may be detected, and the quantizer may be controlled to perform fine quantization when the transition is detected, and thereafter perform coarse quantization.
REFERENCES:
patent: 4245248 (1981-01-01), Netravali et al.
patent: 4371895 (1983-02-01), Koga
patent: 4386366 (1983-05-01), Mori
patent: 4562468 (1985-12-01), Koga
"Interframe Coding at Low Bit Rates with Great Error Resistance", Temine; ICC Conference, Jun. 1980; pp. 1-5.
"Source Coding of T.V. Signals Using Interframe Techniques", Haskell et al., 1975, pp. 9-22.
"Estimating the Velocity of Moving Images in Television Signals", J. O. Limb and J. A. Murphy, Computer Graphics and Image Processing, Academic Press, Inc., 1975.
Furukawa Akihiro
Ohki Jun'ichi
Groody James J.
Kostak Victor R.
NEC Corporation
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