# US 9,883,181 B2 · Video decoding methods and video encoding methods

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- Number: US 9,883,181 B2
- Document ID: US9883181B2
- Status: Granted
- Kind: B2
- Application number: 15/388,798
- Filed: 2016-12-22
- Published: 2017-04-13
- Granted: 2018-01-30
- Earliest claimed: 2012-01-25
- Assignees: Sharp Kabushiki Kaisha
- Applicants: Sharp Kabushiki Kaisha
- Inventors: Sachin G. Deshpande; Christopher A. Segall
- Web page: https://patentgrep.com/patent/US9883181B2

## CPC

- H04N 19/105: Selection of the reference unit for prediction within a chosen coding or prediction mode, e.g. adaptive choice of position and number of pixels used for prediction
- H04N 19/159: Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
- H04N 19/172: the region being a picture, frame or field
- H04N 19/44: Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
- H04N 19/46: Embedding additional information in the video signal during the compression process (H04N19/517, H04N19/68, H04N19/70 take precedence)
- H04N 19/503: involving temporal prediction (adaptive coding with adaptive selection between spatial and temporal predictive coding H04N19/107; adaptive coding with adaptive selection among a plurality of temporal predictive coding modes H04N19/109)
- H04N 19/573: Motion compensation with multiple frame prediction using two or more reference frames in a given prediction direction
- H04N 19/577: Motion compensation with bidirectional frame interpolation, i.e. using B-pictures
- H04N 19/58: Motion compensation with long-term prediction, i.e. the reference frame for a current frame not being the temporally closest one (H04N19/23 takes precedence)
- H04N 19/70: characterised by syntax aspects related to video coding, e.g. related to compression standards
- H04N: PICTORIAL COMMUNICATION, e.g. TELEVISION

## Abstract

A system for decoding a video bitstream includes receiving a reference picture set associated with a frame including a set of reference picture identifiers. The reference picture set identifies one or more reference pictures to be used for inter-prediction of the frame based upon its associated least significant bits of a picture order count based upon the reference picture identifiers. The one or more reference pictures is a second or greater previous frame to the frame having the matching reference picture identifier.

## Claims

### Claim 1

A method for decoding a video bitstream by using a reference picture set containing at least a first reference picture and a second reference picture, comprising:
decoding first information which is least significant bits (LSB) of a picture order count (POC) of a reference picture;
decoding second information which is used to determine a value of most significant bits (MSB) of the POC of the reference picture;
determining third information which is used to determine whether the second information is included in the video bitstream;
checking if the second information is included in the video bitstream by using the third information;
decoding the reference picture set;
decoding a current picture to generate a current decoded picture by using inter prediction based on the reference picture set; and
storing the current decoded picture to be referred for future inter prediction, wherein
the reference picture set is decoded by using at least the first information of the reference picture and the third information;
the first information of the reference picture is included in a slice header of the video bitstream;
the third information is included in the slice header at least after the first information of the reference picture; and
if the checking indicates that the second information is included in the video bitstream, then the second information is included in the slice header at least after the third information.