Method and apparatus for encoding video, and method and apparatus for decoding video

Patent metadata

Field	Value
Publication number	US-9374591-B2
Application number	US-201514714880-A
Country	US
Kind code	B2
Filing date	May 18, 2015
Priority date	Aug 17, 2009
Publication date	Jun 21, 2016
Grant date	Jun 21, 2016

Abstract

A method of decoding an image including extracting information that indicates an intra prediction mode applied to a current block to be decoded, from a bitstream; determining one of neighboring pixels adjacent to the current block and filtered neighboring pixels filtered from the neighboring pixels as reference pixels, based on at least one of a size of the current block and an intra prediction mode of the current block; performing intra prediction on the current block using the extracted information and the determined reference pixels, wherein, when the current block has a size of N×N, where N is integer, the neighboring pixels include 2N neighboring pixels adjacent to an upper side and an upper right side of the current block and 2N neighboring pixels adjacent to a left side and a below left side of the current block.

First claim

What is claimed is:

1. A method of decoding image, the method comprising:
extracting information that indicates an intra prediction mode applied to a current block to be decoded, from a bitstream;
determining one of non-filtered neighboring pixels adjacent to the current block, first filtered neighboring pixels filtered by using the neighboring pixels according to a first filtering method, and second filtered neighboring pixels filtered by using the neighboring pixels according to a second filtering method as reference pixels, based on at least one of a size of the current block and an intra prediction mode of the current block;
performing intra prediction on the current block using the extracted information and the determined reference pixels,
wherein, when the current block has a size of N×N, where N is integer, the neighboring pixels include 2N neighboring pixels adjacent to an upper side and an upper right side of the current block and 2N neighboring pixels adjacent to a left side and a below left side of the current block,
wherein 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 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 the coding unit of the current depth is split into at least one prediction unit.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Min Jung-Hye
• Han Woo-Jin
• Kim Il-Koo

Classifications

• H04N19/117

  Filters, e.g. for pre-processing or post-processing (sub-band filter banks H04N19/635) · CPC title

• H04N19/82

  involving filtering within a prediction loop · CPC title

• H04N19/105 Primary

  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 title

• H04N19/593

  involving spatial prediction techniques · CPC title

• H04N19/44

  Decoders specially adapted therefor, e.g. video decoders which are asymmetric with respect to the encoder · CPC title