VIDEO ENCODING METHOD AND APPARATUS USING TRANSFORMATION UNIT OF VARIABLE TREE STRUCTURE, AND VIDEO DECODING METHOD ANDAPPARATUS

• US 20150172721A1
• Filed: 02/19/2015
• Published: 06/18/2015
• Est. Priority Date: 08/17/2010
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: LEE, Tammy, HAN, Woo-jin
• Granted Patent: US 9,648,349 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• 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 19/122 Selection of transform size, e.g. 8x8 or 2x4x8 DCT; Selection of sub-band transforms of varying structure or type
• CPC Class Codes: H04N 19/136 Incoming video signal characteristics or properties
• CPC Class Codes: H04N 19/172 the region being a picture, frame or field
• CPC Class Codes: H04N 19/174 the region being a slice, e.g. a line of blocks or a group of blocks
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/1883 the unit relating to sub-band structure, e.g. hierarchical level, directional tree, e.g. low-high [LH], high-low [HL], high-high [HH]
• 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 19/46 Embedding additional information in the video signal during the compression process H04N19/517, H04N19/68, H04N19/70 take precedence
• CPC Class Codes: H04N 19/60 using transform coding
• CPC Class Codes: H04N 19/61 in combination with predictive coding
• CPC Class Codes: H04N 19/96 Tree coding, e.g. quad-tree coding

Abstract

A video encoding method is provided, the method includes: encoding a current region of a video by performing a transformation on the current region by using transformation units in a variable tree-structure which are determined from among transformation units that are hierarchically split from a base transformation unit with respect to the current region and which are generated based on a maximum split level of a transformation unit; and outputting encoded data of the current region, information about an encoding mode, and transformation-unit hierarchical-structure information comprising maximum size information and minimum size information of the transformation unit with respect to the video.

Claims

1. A video decoding method comprising:

obtaining, from a bitstream, maximum split information for an inter mode and information about a prediction mode for a coding unit;

when the information about the prediction mode indicates the inter mode, determining a maximum split level of a transformation unit based on the maximum split information for the inter mode, wherein the transformation unit is determined from the coding unit;

when a current split level of a current transformation unit is less than the maximum split level, obtaining sub-split information about the current transformation unit from the bitstream; and

when the sub-split information indicates a split of the current transformation unit, splitting the current transformation unit into transformation units of a next split level, wherein the next split level is greater than the current split level.

2. The video decoding method of claim 1, wherein the maximum split information indicates a maximum number of available splits for generating the transformation unit by splitting the coding unit.

3. The video decoding method of claim 1, wherein the maximum split information for the inter mode is obtained as parameters with respect to one data level from among data levels comprising a picture sequence, a picture, a slice, and a data unit for encoding a video.

4. The video decoding method of claim 1, wherein a minimum size of the transformation unit determined from the coding unit based on the maximum split level of the transformation unit is not less than a minimum size of a transformation unit according to minimum size information of transformation unit obtained from the bitstream or a size of a transformation unit at a lowermost level obtained by splitting the coding unit to the maximum split level.