Inter-layer prediction method for video signal

• US 8,264,968 B2
• Filed: 01/09/2007
• Issued: 09/11/2012
• Est. Priority Date: 01/09/2006
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Seung Wook, Jeon, Byeong Moon, Park, Ji Ho
• Primary Examiner(s): Flynn, Nathan
• Assistant Examiner(s): AVERY, JEREMIAH L
• Application Number:
  US12/087,466
• Publication Number:
  US 20100061456A1
• Time in Patent Office: 2,072 Days
• Field of Search: None
• US Class Current: 370/240
• 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 19/159 Prediction type, e.g. intra-frame, inter-frame or bidirectional frame prediction
• CPC Class Codes: H04N 19/16 for a given display mode, e.g. for interlaced or progressive display mode
• CPC Class Codes: H04N 19/176 the region being a block, e.g. a macroblock
• CPC Class Codes: H04N 19/187 the unit being a scalable video layer
• CPC Class Codes: H04N 19/33 in the spatial domain
• CPC Class Codes: H04N 19/513 Processing of motion vectors
• CPC Class Codes: H04N 19/59 involving spatial sub-sampling or interpolation, e.g. alteration of picture size or resolution
• CPC Class Codes: H04N 19/86 involving reduction of coding artifacts, e.g. of blockiness

Abstract

The present invention relates to a method for conducting interlayer motion prediction in encoding or decoding of video signal. The present method identifies types of pictures on a base layer and a current layer or types of macro blocks included in the pictures, forms a block on a virtual layer by copying motion information of a macro block on the base layer if type of a picture on the current layer or a macro block included therein is identified to field and type of a picture on the base layer or a macro block included therein is identified to progressive, and uses the copied motion information of the block on the virtual layer in interlayer motion prediction for a macro block of the picture on the current layer.

Claims

1. A method for decoding a video signal, the method comprising:

deriving position information of a virtual macroblock corresponding to a frame macroblock of an enhanced layer;

deriving position information of a corresponding macroblock in a base layer based on the position information of the virtual macroblock, the corresponding macroblock being a field macroblock in a MacroBlock Adaptive Frame Field frame (MBAFF frame) and the MBAFF frame being a frame including macroblocks adaptively decoded as one of a frame macroblock and a field macroblock;

obtaining motion information of the corresponding macroblock based on the position information of the corresponding macroblock;

predicting motion information of the frame macroblock of the enhanced layer by using the motion information of the corresponding macroblock, the motion information including a motion vector; and

decoding the frame macroblock of the enhanced layer by using the predicted motion information,

wherein the predicting step includes multiplying a vertical component of the motion vector of the corresponding macroblock by two.

2. The method according to claim 1, wherein the predicting step further includes scaling the multiplied motion vector in vertical and horizontal directions.

3. The method according to claim 1, wherein an aspect ratio of a picture of the base layer and an aspect ratio of a picture of the enhanced layer are different from each other.