Method and apparatus for encoding and decoding motion vector by predicting motion vector according to mode

• US 8,995,529 B2
• Filed: 01/14/2011
• Issued: 03/31/2015
• Est. Priority Date: 01/14/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Lee, Tammy, Han, Woo-jin, Min, Jung-hye
• Primary Examiner(s): PRINCE, JESSICA MARIE
• Application Number:
  US13/006,657
• Publication Number:
  US 20110170602A1
• Time in Patent Office: 1,537 Days
• Field of Search: 375/240.16
• US Class Current: 375/240.16
• CPC Class Codes: H04N 19/103 Selection of coding mode or of prediction mode
• CPC Class Codes: 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
• CPC Class Codes: H04N 19/139 Analysis of motion vectors, e.g. their magnitude, direction, variance or reliability
• CPC Class Codes: H04N 19/147 according to rate distortion criteria rate-distortion as a criterion for motion estimation H04N19/567
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/44 Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder
• CPC Class Codes: H04N 19/51 Motion estimation or motion compensation
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/52 by predictive encoding
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/70 characterised by syntax aspects related to video coding, e.g. related to compression standards
• CPC Class Codes: H04N 19/96 Tree coding, e.g. quad-tree coding

Abstract

Provided are methods and apparatuses for encoding and decoding a motion vector. The method of encoding a motion vector includes: selecting a mode from among a first mode in which information indicating a motion vector predictor of at least one motion vector predictor is encoded and a second mode in which information indicating generation of a motion vector predictor based on pixels included in a previously encoded area adjacent to a current block is encoded; determining a motion vector predictor of the current block according to the selected mode and encoding information about the motion vector predictor of the current block; and encoding a difference vector between a motion vector of the current block and the motion vector predictor of the current block.

Claims

1. An apparatus for encoding a motion vector, the apparatus comprising:

a predictor which obtains motion vector predictor candidates of a current block using a block co-located with the current block in a temporal reference picture in direction List0 or List1 when the prediction mode of the current block is inter-prediction, and obtains a motion vector predictor of the current block among the obtained motion vector predictor candidates;

a first encoder which encodes information about the motion vector predictor of the current block; and

a second encoder which encodes a differential vector between the motion vector predictor of the current block and a motion vector of the current block;

wherein the predictor scales motion vector of the block co-located with the current block in the temporal reference picture based on a first temporal distance and a second temporal distance, the first temporal distance indicates a temporal distance between a reference picture referred to by the block co-located with the current block in the temporal reference picture and the temporal reference picture, and the second temporal distance indicates a temporal distance between a current picture and a reference picture referred to by the current block,

wherein an image is split into a plurality of maximum coding units according to an information about the maximum size of the coding unit,

the maximum coding unit is hierarchically split into one or more coding units of depths including at least one of a current depth and a lower depth, and

the current coding unit of the current depth is one of rectangular data units split from a coding unit of an per depth.

2. A method of decoding a motion vector, the method comprising:

obtaining prediction mode information of a current block from a bitstream;

obtaining motion vector predictor candidates of the current block using a block co-located with the current block in a temporal reference picture in direction List0 List1 when the prediction mode of the current block is inter-prediction;

obtaining a motion vector predictor of the current block among the obtained motion vector predictor candidates based on a information indicating a motion vector predictor used for the current block; and

obtaining a motion vector of the current block based on the obtained motion vector predictor and a differential vector obtained from the bitstream,

wherein the obtaining motion vector predictor candidates of the current block further comprising;

scaling a motion vector of the block co-located with the current block in the temporal reference picture based on a first temporal distance and a second temporal distance, the first temporal distance indicates a temporal distance between a reference picture referred to by the block co-located with the current block in the temporal reference picture and the temporal reference picture, and the second temporal distance indicates a temporal distance between a current picture and a reference picture referred to by the current block,

wherein an image is split into a plurality of maximum coding units according to an information about the maximum size of the coding unit,

the maximum coding unit is hierarchically split into one or more coding units of depths including at least one of a current depth and a lower depth, and

the current coding unit of the current depth is one of rectangular data units split from a coding unit of an upper depth.