Title:
【発明の名称】可変長符号化装置
Document Type and Number:
Japanese Patent JP3416649
Kind Code:
B2
Abstract:
A variable length encoding apparatus such as an encoding apparatus using the MPEG standard, wherein without degrading the precision of quantization step, the generated code bit amount is limited. Encoding is performed at the quantization step of required picture quality by an encoding part 106, and a bit stream 141 is written in an external memory 101. The generated encoded bit amount is measured from the increment of a write pointer 121 increased because of the writing in the external memory 101 by a control unit 107. If the amount is larger than a preset value, the data is replaced with data leading to the same decoding result as those of the preceding or following reference picture by using a replacement pattern in accordance with the picture type and the position on a times series, and the data is written in the external memory 101, thus outputting the data as an output bit stream 111 controlled to the generated code amount within an upper limit value.
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Inventors:
Akihiro Watanabe
Eiji Miyakoshi
Eiji Miyakoshi
Application Number:
JP2000529040A
Publication Date:
June 16, 2003
Filing Date:
January 20, 1999
Export Citation:
Assignee:
Matsushita Electric Industrial Co., Ltd
International Classes:
H03M7/40; H03M7/46; H04N19/114; H04N19/13; H04N19/15; H04N19/159; H04N19/172; H04N19/196; H04N19/423; H04N19/50; H04N19/503; H04N19/51; H04N19/577; H04N19/61; H04N19/625; H04N19/85; H04N19/91; (IPC1-7): H03M7/40; H03M7/30; H04N7/32
Domestic Patent References:
| JP39684A | ||||
| JP568243A | ||||
| JP9200749A | ||||
| JP8275158A | ||||
| JP8137817A |
Attorney, Agent or Firm:
Hiroyuki Ikeuchi (5 outside)