Inter-layer prediction method for video signal

• US 8,619,872 B2
• Filed: 03/08/2010
• Issued: 12/31/2013
• 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): Czekaj, David
• Assistant Examiner(s): ABIMBOLA, KEHINDE
• Application Number:
  US12/659,389
• Publication Number:
  US 20100195714A1
• Time in Patent Office: 1,394 Days
• Field of Search: 375/240.02
• US Class Current: 375/240.25
• 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 texture prediction in encoding or decoding of video signal. The present method constructs a pair of frame macro blocks from a single field macro block or vertically-adjacent two field macro blocks of a base layer, and using texture information of the constructed pair of frame macro blocks in interlayer texture prediction of a pair of frame macro blocks of a current layer.

Claims

1. A method for decoding an image signal, comprising:

deriving virtual position information of a virtual reference macroblock pair, by a video coding apparatus;

deriving position information of a reference macroblock pair based on the virtual position information of the virtual reference macroblock pair, by the video coding apparatus, the reference macroblock pair being included in a Macroblock Adaptive Frame Field frame (MBAFF frame) of a base layer;

obtaining motion information of the reference macroblock pair according to the position information of the reference macroblock pair, wherein if one macroblock in the reference macroblock pair is an intra coded macroblock and the other macroblock in the reference macroblock pair is an inter coded macroblock, motion information of the intra-coded macroblock is set using motion information of the inter-coded macroblock;

predicting motion information of a target macroblock pair from the motion information of the reference macroblock pair, by the video coding apparatus, the target macroblock pair being included in a Macroblock Adaptive Frame Field frame (MBAFF frame) of an enhanced layer; and

decoding the target macroblock pair using the motion information of the target macroblock pair, by the video coding apparatus,

wherein the Macroblock Adaptive Frame Field frame is a frame adaptively decoded as a frame macroblock and a field macroblock,

wherein the enhanced layer differs from the base layer in an aspect ratio or a spatial resolution.

2. The method of claim 1, wherein the virtual reference macroblock pair corresponds to the target macroblock pair of an enhanced layer.

3. The method of claim 1, wherein a type of the target macroblock pair is a frame macroblock, and a type of the reference macroblock pair is a field macroblock.

4. The method of claim 1, wherein the motion information of the target macroblock pair and the reference macroblock pair includes a reference index and a motion vector.

5. The method of claim 4, wherein the motion vector of the target macroblock pair is predicted by multiplying the motion vector of the reference macroblock pair by two when the type of the target macroblock pair is a frame macroblock, and the type of the reference macroblock pair is a field macroblock.

6. The method of claim 4, wherein a vertical component of the motion vector of the target macroblock pair is predicted based on a type of the target macroblock pair and a type of the reference macroblock pair.

7. The method of claim 6, wherein the motion vector of a target macroblock is predicted by a 4×

4 block unit.

8. An apparatus for decoding an image signal, comprising:

a decoding unit configured to derive virtual position information of a virtual reference macroblock pair, and derive position information of a reference macroblock pair based on the virtual position information of the virtual reference macroblock pair 4×

4, the reference macroblock pair being included in a Macroblock Adaptive Frame Field frame (MBAFF frame) of a base layer,

the decoding unit further configured to obtain motion information of the reference macroblock according to the position information of the reference macroblock pair, wherein if one macroblock in the reference macroblock pair is an intra coded macroblock and the other macroblock in the reference macroblock pair is an inter coded macroblock, motion information of the intra-coded macroblock is set using motion information of the inter-coded macroblock, and

the decoding unit further configured to predict motion information of a target macroblock pair from the motion information of the reference macroblock pair according to the position information of the reference macroblock pair, the target macroblock pair being included in a Macroblock Adaptive Frame Field frame (MBAFF frame) of an enhanced layer,

the decoding unit further configured to decode the target macroblock pair by using the motion information of the target macroblock pair,

wherein the Macroblock Adaptive Frame Field frame is a frame adaptively decoded as a frame macroblock and a field macroblock,

wherein the enhanced layer differs from the base layer in an aspect ratio or a spatial resolution.

9. The apparatus of claim 8, wherein the virtual reference macroblock pair corresponds to the target macroblock pair of an enhanced layer.

10. The apparatus of claim 8, wherein a type of the target macroblock pair is a frame macroblock, and a type of the reference macroblock pair is a field macroblock.

11. The apparatus of claim 8, wherein the motion information of the target macroblock pair and the reference macroblock pair includes a reference index and a motion vector, and the motion vector of the target macroblock pair is predicted by a 4×

4 block unit.

12. The apparatus of claim 11, wherein the motion vector of the target macroblock pair is predicted by multiplying the motion vector of the reference macroblock pair by two when the type of the target macroblock pair is a frame macroblock, and the type of the reference macroblock pair is a field macroblock.

13. The apparatus of claim 8, wherein a vertical component of the motion vector of the target macroblock pair is predicted based on a type of the target macroblock pair and a type of the reference macroblock pair.