IMAGE ENCODING METHOD AND DEVICE, AND DECODING METHOD AND DEVICE THEREFOR

• US 20150016525A1
• Filed: 09/30/2014
• Published: 01/15/2015
• Est. Priority Date: 07/02/2008
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: ALSHINA, Elena, ALSHIN, Alexander, SEREGIN, Vadim, SHLYAKHOV, Nikolay, KOROTEEV, Maxim
• Granted Patent: US 9,118,913 B2
• Time in Patent Office: Days
• US Class Current: 375/240.12
• CPC Class Codes: H04N 19/11 among a plurality of spatial predictive coding modes
• CPC Class Codes: H04N 19/117 Filters, e.g. for pre-processing or post-processing sub-band filter banks H04N19/635
• CPC Class Codes: H04N 19/119 Adaptive subdivision aspects, e.g. subdivision of a picture into rectangular or non-rectangular coding blocks
• CPC Class Codes: H04N 19/13 Adaptive entropy coding, e.g. adaptive variable length coding [AVLC] or context adaptive binary arithmetic coding [CABAC]
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/182 the unit being a pixel
• CPC Class Codes: H04N 19/198 including smoothing of a sequence of encoding parameters, e.g. by averaging, by choice of the maximum, minimum or median value
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/50 using predictive coding H04N19/61 takes precedence
• CPC Class Codes: H04N 19/593 involving spatial prediction techniques
• CPC Class Codes: H04N 19/82 involving filtering within a prediction loop
• CPC Class Codes: H04N 19/91 Entropy coding, e.g. variable length coding [VLC] or arithmetic coding

Abstract

A video encoding method and apparatus and a video decoding method and apparatus. In the video encoding method, a first predicted coding unit of a current coding unit that is to be encoded is produced, a second predicted coding unit is produced by changing a value of each pixel of the first predicted coding unit by using each pixel of the first predicted coding unit and at least one neighboring pixel of each pixel, and the difference between the current coding unit and the second predicted coding unit is encoded, thereby improving video prediction efficiency.

Claims

1. A method of decoding an image, the method comprising:

determining at least one coding unit included in a maximum coding unit by splitting the maximum coding unit according to split information obtained from a bitstream;

obtaining at least one prediction unit from a current coding unit;

obtaining a first predicted value of a current prediction unit by using neighboring pixels of the current prediction unit; and

obtaining a second predicted value of pixels of the current prediction unit located on a top border and a left border of the current prediction unit by using the obtained first predicted value and at least one neighboring pixel,

wherein;

the second predicted value of the current prediction unit is obtained by using the at least one neighboring pixel and a weighted value of the obtained first predicted value, and the second predicted value of a top-left pixel of the current prediction unit is obtained by using a first neighboring pixel located at a same column as the top-left pixel and a second neighboring pixel located at a same row as the top-left pixel,

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

the maximum coding unit is hierarchically split into one or more coding units of depths according to the split information,

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

when the split information indicates a split for the current depth, the coding unit of the current depth is split into coding units of a lower depth, independently from neighboring coding units, and

when the split information indicates a non-split of the current depth, at least one prediction unit is obtained from the coding unit of the current depth.