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

• US 9,131,237 B2
• Filed: 10/15/2014
• Issued: 09/08/2015
• 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:
  US14/515,226
• Publication Number:
  US 20150049816A1
• Time in Patent Office: 328 Days
• Field of Search: 375/240.12
• US Class Current: 1/1
• 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 decoding an image, the apparatus comprising:

a coding information extractor which obtains prediction mode of a current block from a bitstream;

an image data decoder which obtains spatial motion vector predictor candidates using a neighboring block adjacent to the current block and a temporal motion vector predictor candidate of the 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, obtains a motion vector predictor of the current block among the obtained motion vector predictor candidates based on information indicating a motion vector predictor used for the current block, and obtains a motion vector of the current block based on the obtained motion vector predictor and a differential vector obtained from the bitstream,

wherein the neighboring block adjacent to the current block includes a block located on a lower-left side of the current block,

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

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

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