发明授权
- 专利标题： Variable length coding method and variable length decoding method
- 专利标题（中）： 可变长度编码方法和可变长度解码方法
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申请号： US13603821申请日： 2012-09-05
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公开(公告)号： US08804838B2公开(公告)日： 2014-08-12
- 发明人: Satoshi Kondo , Shinya Kadono , Makoto Hagai , Kiyofumi Abe
- 申请人： Satoshi Kondo , Shinya Kadono , Makoto Hagai , Kiyofumi Abe
- 申请人地址： US CA Torrance
- 专利权人： Panasonic Intellectual Property Corporation of America
- 当前专利权人： Panasonic Intellectual Property Corporation of America
- 当前专利权人地址： US CA Torrance
- 代理机构： Wenderoth, Lind & Ponack, L.L.P.
- 优先权： JP2002-126029 20020426; JP2002-363107 20021213
- 主分类号： H04N11/02
- IPC分类号： H04N11/02
摘要：
A variable length coding method is comprised of: a coefficient value scanning step in which an RL sequence generation unit 203, a reordering unit 202, and a binarization unit 203 scan coefficient values within a block in a predetermined scanning order starting at a higher-frequency component toward a lower-frequency component; and an arithmetic coding step in which an arithmetic coding unit 205 and a table storage unit 204 perform arithmetic coding on the absolute values of the coefficient values according to the scanning order used in the coefficient value scanning step, by switching between probability tables 1˜4 for use, wherein, in the arithmetic coding step, a probability table to be used is switched to another probability table in one direction, when the arithmetic-coded absolute values of the coefficient values include an absolute value exceeding a predetermined threshold value.
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