Television – Bandwidth reduction system – Data rate reduction
Patent
1992-10-23
1995-09-26
Britton, Howard W.
Television
Bandwidth reduction system
Data rate reduction
H04N 736
Patent
active
054537916
ABSTRACT:
Derived from a picture input signal and a motion vector signal in a block matching type motion compensation encoding device, a prediction error signal is quantized by a controllable quantizer into a quantized signal for encoding together with the motion vector signal. Supplied with frame pulses, a controller produces a control signal with a predetermined value for making the quantizer quantize a zero signal instead of the error signal and with a different value for operating the quantizer merely as a forward quantizer. An amount of encoded information is reduced when the predetermined value appears once in two or three frame periods. For smoother movement of a movable part in reproduced pictures, the zero signal is not substituted in each duration in which motion vectors are either greater in magnitude, not identical with a representative vector, or less correlated with corresponding motion vectors in a previous picture for which the zero signal is not substituted. Each duration may be an interval of time during which the error signal has a greater absolute value. The controllable quantizer may be a combination of the forward quantizer and a selector controlled by the control signal to select the zero signal and either the error signal or an output signal of the forward quantizer.
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Koga et al., "Motion-Compensated Interframe Coding for Video Conference", Communication System Study Group Pamphlet, CS 81-87, pp. 85-90, published Jul. 22, 1981 by the Institute of Electronics and Communication Engineers of Japan.
Koga et al., "A 1.5 Mb/s Interframe Codec with Motion Compensation" (numbered 83CH1874.7/83/0000.1161), IEEE International Conference on Communications, Jun. 19-22, 1983.
Britton Howard W.
NEC Corporation
Tung Bryan S.
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