Method and apparatus for second or later generation coding of video signal
AssigneeKokusai Denshin Denwa Kabushiki Kaisha
InventorsYasuhiro Takishima, Shigeyuki Sakazawa, Masahiro Wada
Life of this patent
Estimating the term…
Abstract
At second or later generation coding of video signal in tandem video coding, at least one coding parameter of previous coding is estimated in accordance with picture properties of the input video signal, and the estimated coding parameter in the previous coding is used in the second or later coding.
Claims24
A method for second or later generation coding of a video signal in tandem stage coding which includes a previous stage coding process and a later stage coding process which are separately and sequentially executed, comprising the steps of:
- estimating at least one coding parameter used in the previous stage coding process in accordance with picture properties of the video signal coded by said previous stage coding process;
- and
- secondly coding the video signal coded by said previous stage coding process based upon the estimated coding parameter.
A method for second or later generation coding of video signal in tandem stage coding, comprising the steps of:
- deciding a quantization step size of a second coding Q2 with respect to a quantization step size of the previous stage coding Q1 so as to satisfy Q2≧Q1 and Q2=n×Q1, where n is a natural number, and
- secondly coding the input video signal based upon the decided quantization step size Q2.
An apparatus for second or later generation coding of a video signal in tandem stage coding which includes a previous stage coding process and a later stage coding process which are separately and sequentially executed, comprising:
- means for estimating at least one coding parameter used in the previous stage coding process in accordance with picture properties of the video signal coded by said previous stage coding process;
- and
- means for secondly coding the video signal coded by said previous stage coding process, based upon the estimated coding parameter.
A apparatus for second or later generation coding of video signal in tandem stage coding, comprising:
- means for deciding a quantization step size of a second coding Q2 with respect to a quantization step size of the previous stage coding Q1 so as to satisfy Q2≧Q1 and Q2=n×Q1, where n is a natural number, and
- means for secondly coding the input video signal based upon the decided quantization step size Q2.
Dependencies are inferred from the claim text.