Encoder, decoder, encoding method, and decoding method

Patent metadata

Field	Value
Publication number	US-10652544-B2
Application number	US-201916256307-A
Country	US
Kind code	B2
Filing date	Jan 24, 2019
Priority date	Aug 9, 2017
Publication date	May 12, 2020
Grant date	May 12, 2020

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,

the processing circuitry further includes the parameter in a picture parameter set, and
the image split by the processing circuitry is a picture.

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
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.

4. 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,

the processing circuitry further includes the parameter in a picture parameter set, and
the image is a picture.

5. 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, wherein
the parameter is included in a picture parameter set, and
the image is a picture.

6. 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, wherein
the parameter is included in a picture parameter set, and
the image is a picture.

Assignees

• Panasonic Ip Corp America

Inventors

• Ikeda Tatsuhiko

Classifications

• H03M7/4006

  Conversion to or from arithmetic code · CPC title

• H03M7/4018

  Context adapative binary arithmetic codes [CABAC] · CPC title

• H04N19/52

  by predictive encoding · CPC title

• H04N19/117

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title

• H04N19/176

  the region being a block, e.g. a macroblock · CPC title