Arithmetic decoding method, image decoding apparatus, arithmetic coding method, and image coding apparatus
AssigneeSharp Kabushiki Kaisha
InventorsTomohiro IKAI, Takeshi TSUKUBA
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Abstract
There is provided a terminal device capable of efficiently performing communication in a communication system in which a base station device and the terminal device communicate with each other. The terminal device that communicates with the base station device by using a plurality of aggregated cells recognizes that a serving cell is stopped in a first state, recognizes that the serving cell is started in a second state, and switches from the first state to the second state based on a received PDCCH.
Claims7
(canceled)
An arithmetic decoding method for decoding coded data of a transform coefficient for each unit domain, the method comprising:
- a sub-block coefficient presence/absence flag decoding step to decode a sub-block coefficient presence/absence flag indicating whether or not one or more non-zero transform coefficient are included in each of a plurality of sub-blocks into which the unit domain is split;
- and
- a context index deriving step to derive a context index corresponding to a transform coefficient presence/absence flag indicating whether or not a transform coefficient of a target sub-block is 0, wherein
- the context index deriving step derives the context index having one of three different values, in a case where the non-zero transform coefficient is not included in two or more adjacent sub-blocks which are adjacent to the target sub-block.
An image decoding apparatus comprising:
- a memory and
- a processor, wherein the processor configured to perform steps of:
- decoding a sub-block coefficient presence/absence flag indicating whether or not one or more non-zero transform coefficient are included in each of a plurality of sub-blocks into which the unit domain is split;
- and
- deriving a context index corresponding to a transform coefficient presence/absence flag indicating whether or not a transform coefficient of a target sub-block is 0, wherein
- the context index is one of three different values, in a case where the non-zero transform coefficient is not included in two or more adjacent sub-blocks which are adjacent to the target sub-block.
An arithmetic coding method for arithmetically coding each element of syntax indicating a transform coefficient for each unit domain, the method comprising:
- a sub-block coefficient presence/absence flag coding step to code a sub-block coefficient presence/absence flag indicating whether or not one or more non-zero transform coefficient are included in each of a plurality of sub-blocks into which the unit domain is split;
- and
- a context index deriving step to derive a context index corresponding to a transform coefficient presence/absence flag indicating whether or not a transform coefficient of a target sub-block is 0, wherein
- the context index deriving step derives the context index having one of three different values, in a case where the non-zero transform coefficient is not included in two or more adjacent sub-blocks which are adjacent to the target sub-block.
An image coding apparatus comprising:
- a memory and
- a processor, wherein the processor configured to perform steps of:
- coding a sub-block coefficient presence/absence flag indicating whether or not one or more non-zero transform coefficient are included in each of a plurality of sub-blocks into which the unit domain is split;
- and
- deriving a context index corresponding to a transform coefficient presence/absence flag indicating whether or not a transform coefficient of a target sub-block is 0, wherein
- the context index is one of three different values, in a case where the non-zero transform coefficient is not included in two or more adjacent sub-blocks which are adjacent to the target sub-block.
Dependencies are inferred from the claim text.