Inter-Layer Prediction Method for Video Signal

• US 20100061456A1
• Filed: 01/09/2007
• Published: 03/11/2010
• 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
• Granted Patent: US 8,264,968 B2
• Time in Patent Office: Days
• US Class Current: 375/240.160
• 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

1-7. -7. (canceled)

8. A method for encoding or decoding a video signal, the method comprising:

identifying types of pictures of lower and upper layers;

copying motion information of a block in the picture of the lower layer to construct a block of a virtual picture if the type of the picture of the lower layer is field and the type of the picture of the upper layer is progressive;

upsampling the virtual picture; and

predicting motion information of a frame macroblock of the upper layer by using the upsampled virtual picture.

9. The method according to claim 8, wherein the upsampling step is performed in vertical and horizontal directions at different upsampling rates.

10. The method according to claim 8, wherein the upsampling step includes enlarging the virtual picture so as to have the same resolution as that of the picture of the upper layer and also extending motion vectors of the virtual picture.

11. The method according to claim 8, wherein an aspect ratio of the picture of the lower layer and an aspect ratio of the picture of the upper layer are different from each other.

12. A method for encoding or decoding a video signal, the method comprising the steps of:

identifying types of pictures of lower and upper layers and/or types of macroblocks in the pictures;

copying motion information of a block in the picture of the lower layer to construct a block of a virtual picture if the type of the picture of the lower layer or the type of the macroblock in the picture of the lower layer is field and the type of the picture of the upper layer or the type of the macroblock in the picture of the upper layer is progressive; and

predicting motion information of a macroblock of the upper layer by using the copied motion information of the block of the virtual picture.

13. The method according to claim 12, wherein the step of constructing the block of the virtual picture includes constructing a virtual picture having copied information of texture information and motion information of the picture of the lower layer.

14. The method according to claim 12, wherein the method includes upsampling the virtual picture in the interlayer prediction.

15. The method according to claim 14, wherein the upsampling is performed in vertical and horizontal directions at different upsampling rates.

16. The method according to claim 12, wherein an aspect ratio of the picture of the lower layer and an aspect ratio of the picture of the upper layer are different from each other.