Encoder, decoder, encoding method, and decoding method

Patent metadata

Field	Value
Publication number	US-2019158839-A1
Application number	US-201916256307-A
Country	US
Kind code	A1
Filing date	Jan 24, 2019
Priority date	Aug 9, 2017
Publication date	May 23, 2019
Grant date	—

Abstract

An encoder includes processing circuitry, a block memory, and a frame memory. The processing circuitry defines at least one parameter for each of plural types of segment_ids, splits an image into blocks, assigns, to each of the blocks, segment_id according to a type of the block, among the plural types of segment_ids, and sequentially encodes the blocks. In encoding the blocks, the processing circuitry identifies segment_id of a current block to be encoded, and encodes the current block using the at least one parameter defined for identified segment_id. The at least one parameter includes seg_context_idx for identifying probability information associated with context used in context-based adaptive binary arithmetic coding (CABAC).

First claim

What is claimed is:

1 . An encoder, comprising:
processing circuitry; and a memory coupled to the processing circuitry, wherein using the memory, the processing circuitry
splits an image into blocks,
identifies segment information of a current block to be encoded among the blocks, and
encodes the current block using a parameter regarding probability information for entropy encoding, the parameter corresponding to the segment information.

2 . The encoder according to claim 1 , wherein
the processing circuitry further encodes block split information indicating a split pattern of the image.

3 . The encoder according to claim 1 , wherein
the processing circuitry further includes the parameter in a picture parameter set, and the image split by the processing circuitry is a picture.

4 . The encoder according to claim 1 , wherein
in encoding the current block, the processing circuitry encodes the current block using the parameter which is a parameter associated with a combination of information on a split depth of the current block and the segment information identified.

5 . A decoder, comprising:
processing circuitry; and a memory coupled to the processing circuitry, wherein using the memory, the processing circuitry
identifies segment information of a current block to be decoded among blocks included in an image, and
decodes the current block using a parameter regarding probability information for entropy decoding, the parameter corresponding to the segment information.

6 . An encoding method, comprising:
splitting an image into blocks, identifying segment information of a current block to be encoded among the blocks, and encoding the current block using a parameter regarding probability information for entropy encoding, the parameter corresponding to the segment information.

7 . A decoding method, comprising:
identifying segment information of a current block to be decoded among blocks included in an image, and decoding the current block using a parameter regarding probability information for entropy decoding, the parameter corresponding to the segment information.

Assignees

• Panasonic Ip Corp America

Inventors

• Ikeda Tatsuhiko

Classifications

• H04N19/61

  in combination with predictive coding · CPC title

• H03M7/6035

  Handling of unkown probabilities · CPC title

• H03M7/6005

  Decoder aspects · CPC title

• H04N19/13 Primary

  Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC] · CPC title

• H03M7/4006

  Conversion to or from arithmetic code · CPC title