Arithmetic decoding method and arithmetic coding method
AssigneePanasonic Intellectual Property Corporation of America
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.
Claims14
An arithmetic decoding method in which a context variable is initialized and arithmetic decoding is performed, using the context variable, on a binary string which corresponds to a value of a given variable, the context variable specifying a probability of a possible value of each of elements included in the binary string, the arithmetic decoding method comprising:
- determining, using a processor, an initialization method from among a plurality of initialization methods as a method of initializing the context variable, the 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,
- wherein, in at least one of the plurality of initialization methods, an initial value of the context variable is derived using a quantization step for chrominance.
An arithmetic coding method in which a context variable is initialized and arithmetic coding is performed, using the context variable, on a binary string which corresponds to a value of a given variable, the context variable specifying a probability of a possible value of each of elements included in the binary string, the arithmetic coding method comprising:
- determining, using a processor, an initialization method from among a plurality of initialization methods as an initialization method of the context variable, the determined 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,
- wherein, in at least one of the plurality of initialization methods, an initial value of the context variable is derived using a quantization step for chrominance.
An arithmetic coding apparatus which initializes a context variable and performs, using the context variable, arithmetic coding on a binary string which corresponds to a value of a given variable, the context variable specifying a probability of a possible value of each of elements included in the binary string, the arithmetic coding apparatus comprising:
- a determining unit configured to determine an initialization method from among a plurality of initialization methods as an initialization method of the context variable, the initialization method corresponding to the given variable or a group which includes the given variable;
- and
- an initializing unit configured to initialize the context variable using the determined initialization method,
- wherein, in at least one of the plurality of initialization methods, an initial value of the context variable is derived using a quantization step for chrominance.
Dependencies are inferred from the claim text.