Arithmetic decoding method and arithmetic coding method
AssigneeSun Patent Trust
InventorsHisao Sasai, Takahiro Nishi, Youji Shibahara, Toshiyasu Sugio
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Abstract
An arithmetic decoding method is a method in which a context variable specifying a probability of a possible value of each of elements included in a binary string corresponding to a value of a given variable is initialized and arithmetic decoding is performed, using the context variable. The method includes: determining, from among a plurality of initialization methods as a method of initializing the context variable, an initialization method corresponding to the given variable or a group which includes the given variable; and initializing the context variable using the determined initialization method.
Claims2
A binary arithmetic decoding method for decoding a plurality of parameters included in a binary string, the binary arithmetic decoding method comprising:
- initializing a context variable for each of the parameters, the context variable specifying a probability of a possible value of the parameter;
- and
- arithmetic decoding, using the context variable as an initial value, on the parameter which corresponds to a value of a given variable,
- wherein each of the parameters has an initializing method from among a plurality of initializing methods for initializing the context variables, and
- wherein in the initializing, either one of a first initializing method and a second initializing method different from the first initializing method is selected for the parameter from among the plurality of initializing methods, (i) the context variable being initialized by the first initializing method when the first initialized method is selected and (ii) the context variable being initialized by the second initializing method when the second initialized method is selected.
An arithmetic coding method for coding a plurality of parameters included in a binary string, the binary arithmetic coding method comprising:
- initializing a context variable for each parameter, the context variable specifying a probability of a possible value of the parameter;
- and
- arithmetic coding, using the context variable as an initial value, on the parameter which corresponds to a value of a given variable,
- wherein each of the parameters has an initializing method from among a plurality of initializing methods for initializing the context variables, and
- wherein in the initializing, either one of a first initializing method and a second initializing method different from the first initializing method is selected for the parameter from among the plurality of initializing methods, (i) the context variable being initialized by the first initializing method when the first initialized method is selected and (ii) the context variable being initialized by the second initializing method when the second initialized method is selected.
Dependencies are inferred from the claim text.