SCALABLE VIDEO CODING METHOD AND APPARATUS USING INTER PREDICTION MODE

1 . A scalable video decoding method based on multiple layers, comprising:

determining motion information prediction mode on a target decoding block of an enhancement layer;

predicting motion information on the target decoding block of the enhancement layer using motion information on neighboring blocks of the enhancement layer, if the determined motion information prediction mode is a first mode; and

predicting the motion information on the target decoding block of the enhancement layer using motion information on a corresponding block of a reference layer, if the determined motion information prediction mode is a second mode.

2 . The scalable video decoding method of claim 1 , wherein:

the motion information prediction mode is determined based on information signaled by a coding apparatus, and

the signaling information comprises a flag indicating whether inter-layer inter coding is performed or not.

3 . The scalable video decoding method of claim 1 , wherein determining the motion information prediction mode is performed in a Coding Unit (CU).

4 . The scalable video decoding method of claim 1 , wherein predicting the motion information in the first mode comprises:

decoding a motion merging candidate index if the first mode is not a skip mode; and

selecting any one motion merging candidate from a motion merging candidate list in which the motion information on the neighboring blocks are combined as a motion vector for the target decoding block of the enhancement layer using the decoded motion merging candidate index.

5 . The scalable video decoding method of claim 1 , wherein predicting motion information in the first mode comprises:

decoding a motion prediction candidate index if the first mode is not a skip mode;

selecting any one motion prediction candidate from the motion prediction candidate list, comprising the motion information on the neighboring blocks, using the decoded motion prediction candidate index; and

generating a motion vector for the target decoding block of the enhancement layer by merging a Motion Vector Difference (MVD) with the selected motion prediction candidate.

6 . The scalable video decoding method of claim 1 , wherein predicting the motion information in the second mode comprises scaling the motion information on the corresponding block of the reference layer according to a difference between resolutions of the reference layer and the enhancement layer.

7 . The scalable video decoding method of claim 6 , wherein predicting the motion information in the second mode comprises generating a motion vector for the target decoding block of the enhancement layer by merging an MVD with the scaled motion information, if the second mode is a skip mode.

8 . The scalable video decoding method of claim 1 , wherein the reference layer is a base layer.

9 . A scalable video decoding apparatus based on multiple layers, comprising:

a first motion prediction module configured to predict motion information on a target decoding block of an enhancement layer using motion information on neighboring blocks; and

a second motion prediction module configured to predict motion information on a target decoding block of the enhancement layer using motion information on a corresponding block of a reference layer,

wherein any one of the first and the second motion prediction units is used to predict the motion information on the target decoding block of the enhancement layer according to motion information prediction mode signaled by a coding apparatus.

10 . The scalable video decoding apparatus of claim 9 , wherein the first motion prediction module comprises a motion merging module for selecting any one motion merging candidate from a motion merging candidate list in which the motion information on the neighboring blocks are combined as a motion vector for the target decoding block of the enhancement layer using a motion merging candidate index, if mode is not a skip mode.

11 . The scalable video decoding apparatus of claim 9 , wherein the first motion prediction module comprises a motion vector prediction module for selecting any one motion prediction candidate from a motion prediction candidate list, comprising the motion information on the neighboring blocks, using a motion prediction candidate index, if mode is not a skip mode, and configuring a motion vector for the target decoding block of the enhancement layer by merging a Motion Vector Difference (MVD) with the selected motion prediction candidate.

12 . The scalable video decoding apparatus of claim 9 , wherein the second motion prediction module comprises:

a scaling unit for scaling the motion information on the corresponding block of the reference layer according to a difference between resolutions of the reference layer and the enhancement layer; and

a motion vector generating unit for generating a motion vector for the target decoding block of the enhancement layer by merging an MVD with the scaled motion information.