Image Decoding Device and Image Coding Device

Patent metadata

Field	Value
Publication number	US-2016165249-A1
Application number	US-201615012597-A
Country	US
Kind code	A1
Filing date	Feb 1, 2016
Priority date	Sep 28, 2012
Publication date	Jun 9, 2016
Grant date	—

Abstract

A reference picture information decoding unit ( 13 ) omits decoding of a reference list sorting presence or absence flag and/or a reference list sorting order based on the number of current picture referable pictures.

First claim

1 . (canceled)

2 . An image decoding method comprising:
receiving a bitstream comprising one or more coding parameters used in decoding a target picture of the video sequence deriving, based on the bitstream, a reference picture set to be applied to the target picture; generating a reference picture list based on reference picture list (RPL) modification information decoded from a slice header and the reference picture set; determining a value of a first flag included in the one or more coding parameters, the first flag indicating whether information regarding list sorting is present within the slice header; and omitting decoding of a part of information included in the RPL modification information,
wherein the RPL modification information includes at least a reference picture list sorting presence or absence flag and a reference list sorting order, and
wherein decoding of the reference picture list sorting presence or absence flag and the reference list sorting order is omitted based on the number of current picture referable pictures and the value of the first flag.

3 . The method of claim 2 , wherein the reference picture list sorting presence or absence flag is decoded from the bitstream upon determining that the number of current picture referable pictures is greater than 1, and that the first flag has a non-zero value.

4 . The method of claim 2 , wherein the one or more coding parameters are included in a sequence parameter set (SPS).

5 . The method of claim 2 , further comprising generating a predicted image based on a decoded portion of the RPL modification information.

6 . The method of claim 5 , further comprising decoding the target picture based on the predicted image.

Assignees

• Dolby Int Ab

Inventors

• Yamamoto Tomoyuki
• Ikai Tomohiro
• Yasugi Yukinobu
• Tsukuba Takeshi

Classifications

• H04N19/537

  Motion estimation other than block-based · CPC title

• H04N19/50

  using predictive coding (H04N19/61 takes precedence) · CPC title

• H04N19/61

  in combination with predictive coding · CPC title

• H04N19/577

  Motion compensation with bidirectional frame interpolation, i.e. using B-pictures · CPC title

• H04N19/573

  Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction · CPC title