Inter-layer prediction method for video signal

• US 8,494,042 B2
• Filed: 01/09/2007
• Issued: 07/23/2013
• 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:
  US12/087,464
• Publication Number:
  US 20090220000A1
• Time in Patent Office: 2,387 Days
• Field of Search: 375/240
• US Class Current: 375/240
• 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 checks whether at least one of vertically-adjacent two macro blocks on a base layer is intra mode, and if only one of the two macro blocks is identified to intra mode, motion information of an inter-mode macro block of the two macro blocks is copied to the other intra-mode macro block in order to set the intra-mode macro block to a macro block having motion information.

Claims

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

obtaining a type of a corresponding macroblock in a base layer, and a type of a current macroblock in an enhanced layer, the type indicating whether a macroblock is a frame macroblock or a field macroblock, and the corresponding macroblock being included in macroblock pair of a MacroBlock Adaptive Frame Field frame (MBAFF frame);

constructing a frame macroblock from the field macroblock in the base layer, when the type of the corresponding macroblock is the field macroblock;

setting, when the corresponding macroblock is intra-coded and the other macroblock in the macroblock pair is inter-coded, motion information of the corresponding macroblock to motion information of the other macroblock in the macroblock pair;

deriving motion information of the current macroblock in the enhanced layer using the motion information of the corresponding macroblock; and

decoding the current macroblock using the predicted motion information of the current macroblock,

wherein the MBAFF frame is a frame including macroblocks adaptively coded as frame macroblock or field macroblock,

wherein the type of the corresponding macroblock is the field macroblock and the type of the current macroblock is a frame macroblock.

2. The method according to claim 1, wherein the current macroblock in the enhanced layer is included in the MBAFF frame.

3. The method according to claim 1, wherein the motion information includes a motion vector and a reference index.

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

obtaining a type of a corresponding macroblock in a base layer, and a type of a current macroblock in an enhanced layer, the type indicating whether a macroblock is a frame macroblock or a field macroblock, the corresponding macroblock in the base layer being included in a macroblock pair of a MacroBlock Adaptive Frame Field frame (MBAFF frame), the macroblock pair including a top macroblock and a bottom macroblock;

constructing a frame macroblock from the field macroblock in the base layer, when the type of the corresponding macroblock is the field macroblock

confirming, whether or not a top macroblock of the macroblock pair in the base layer is of intra mode;

setting, when the top macroblock is intra mode and the corresponding macroblock is the top macroblock, motion information of the corresponding macroblock using motion information of the bottom macroblock in the macroblock pair;

predicting motion information of the current macroblock in the enhanced layer by using the motion information of the corresponding macroblock, the corresponding macroblock being determined based on the confirming step; and

decoding the current macroblock using the predicted motion information of the current macroblock,

wherein the MBAFF frame is a frame including macroblocks adaptively coded as frame macroblock or field macroblock,

wherein the type of the corresponding macroblock is the field macroblock and the type of the current macroblock is a frame macroblock.

5. The method according to claim 4, wherein the motion information is information about a motion vector and a reference index.

6. The method according to claim 4, wherein the top macroblock is set to the corresponding macroblock if the top macroblock of the macroblock pair is not intra mode.

7. The method according to claim 4, wherein a bottom macroblock is set to the corresponding macroblock if the top macroblock of the macroblock pair is intra mode.

8. The method according to claim 4, wherein the current macroblock in the enhanced layer is included in the MBAFF frame.