Video decoder using adaptive macroblock leak signals

Details Video decoder using adaptive macroblock leak signals Video decoder using adaptive macroblock leak signals

1992-08-05

1994-01-11

Chin, Tommy P.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358133, H04N 7137, H04N 7133, H04N 713

Patent

active

052786471

ABSTRACT:
A decoder for a modified and improved MPEG signal syntax includes a subtractor responsive to an input signal, a frame buffer responsive to the subtractor, a motion compensator responsive to the buffer and to applied motion vector signals, and a multiplier responsive to frame leak signals and to a modified prediction signal for developing an output signal applied to the subtractor. Furthermore, the decoder includes a processor responsive to the motion compensator and to applied adaptive macroblock leak signals for developing the modified prediction signal. The processor comprises a transform circuit responsive to the motion compensator, a gating template responsive to the transform circuit and the adaptive macroblock leak signals, and an inverse transform circuit responsive to the gating template. The transform circuit operates on 2.times.2 blocks of pixels to form 2.times.2 blocks of transform elements. The gating template is responsive to signals that specify a treatment for 2.times.2 blocks of transform elements.

REFERENCES:
patent: 5083206 (1992-01-01), Knauer et al.
patent: 5128756 (1992-07-01), Johnston et al.
patent: 5134475 (1992-07-01), Johnston et al.
patent: 5134477 (1992-07-01), Knauer et al.
patent: 5136377 (1992-08-01), Johnston et al.
CCITT Recommendation H.261, Live Transmission on Non-Telephone Signals, Video Codec for Audiovisual Services at p.times.64 kbits/s, Geneva, pp. 5-6 (1990).

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