Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1996-06-20
1997-08-12
Truong, Khoi D.
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
348423, 341 67, 382246, 382248, H04N 576, H04N 750
Patent
active
056574169
ABSTRACT:
An encoded video data re-compressing apparatus further compresses, for further transmission or storage, an encoded video data stream that includes quantization parameters and quantized coefficients without having to decompress the encoded video data streams and subsequently re-compress the decompressed video data. The encoded video data stream is parsed for extracting the quantization parameters and quantized coefficients from other side information. The quantized coefficients are either divided by a predetermined integer or selectively discarded to reduce the total number of bits. In the former case, the corresponding quantization parameters are multiplied by a predetermined integer. The manipulated coefficients and quantization parameters are multiplexed with the side information, such that they occupy the location of the corresponding original coefficients and quantization parameters in the video data stream. Equipped with a digital data recorder and a set of switches, the encoded digital video data stream could be recorded in either its original form (a normal recording mode) or a more compact form (a long recording mode) by dividing the quantized coefficients by a predetermined integer or selectively discarding some of the coefficients.
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Matsushita Electric - Industrial Co., Ltd.
Truong Khoi D.
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