Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1995-12-06
1998-10-20
Chevalier, Robert
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
386112, H04N 5917, H04N 726
Patent
active
058259708
ABSTRACT:
In a quantization number selecting apparatus and method for a DVCR which can simplify the hardware configuration of a quantizer and can efficiently assign a proper quantization number minimizing quantization errors, the apparatus includes a plurality of quantizers serially connected and having each quantization number, for receiving a video segment composed of a plurality of macro-blocks and sequentially performing quantization according to each area number and class number, a plurality of bit-rate calculators for calculating each bit rate by the respective outputs of the plurality of quantizers, a plurality of quantization error summing portions serially connected for calculating quantization errors by the outputs of the plurality of quantizers and sequentially summing the same, and a bit estimator for selecting a quantization number by which each macro-block can be compressed into an adaptive length by the respective outputs of the bit-rate calculators and quantization error summing portions. Also, the method includes the steps of (1) sequentially quantizing a plurality of macro-blocks constituting a video segment, (2) calculating and sequentially summing bit-rates and quantization errors depending on the plurality of quantized macro-blocks, and (3) searching a macro-block having the minimum quantization error based on the calculated and summed bit-rates and quantization errors and allotting a quantization number having an adaptive bit-rate.
REFERENCES:
patent: 5150208 (1992-09-01), Otaka et al.
patent: 5528298 (1996-06-01), Enari et al.
patent: 5530478 (1996-06-01), Sasaki et al.
patent: 5537440 (1996-07-01), Eyuboglu et al.
Chevalier Robert
LG Electronics Inc.
White John P.
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