Motion video signal processing for recording or reproducing – Local trick play processing – With randomly accessible medium
Patent
1996-11-06
1999-11-02
Tran, Thai
Motion video signal processing for recording or reproducing
Local trick play processing
With randomly accessible medium
348405, 348419, H04N 592, H04N 712, H04N 1102, H04N 1104
Patent
active
059785446
ABSTRACT:
The object of the present invention is to provide a video compression coding apparatus which, in the case where a code quantity variation allows a greater margin, can compress video data while suppressing any degradation of a video quality. First, input video data, after being transformed by a DCT section to a DCT coefficient, is quantized, by a quantizing section, with a quantization level designated with quantization control data. This quantized data is input to a variable length coding section where it is compression-coded in a block unit corresponding to a field or frame. A code quantity detecting section detects a code quantity of this coded data and delivers a result of detection to a quantization control section. The quantization control section has a given coding quantity-quantization level control characteristic representing a relation, to the quantization level, of the code quantity which obtains an average code quantity of initially input video data. The quantization control section determines a quantization level of the next block on the basis of the control characteristic and code quantity information from the code quantity detecting section and generates corresponding quantization control data.
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Kawamura Kouei
Sano Yuuzi
Shimada Hideyuki
Tanabiki Noriaki
Kabushiki Kaisha Toshiba
Tran Thai
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