Method and apparatus for decoding/encoding a video signal with inter-view reference picture list construction

1. A method for managing a reference picture with a decoding apparatus, comprising:

receiving, with the decoding apparatus, a multi-view video data stream, the multi-view video stream including video data for each of a plurality of views, each of the plurality of views corresponding to a different spatial angle, the multi-view video data stream including a random access picture, the random access picture including a random access slice, the random access slice referencing only a slice corresponding to a same time and a different view of the random access picture;

initializing, with the decoding apparatus, a reference picture list of the random access slice for inter-view prediction, the initializing including ordering inter-view reference pictures for the random access picture in a decoded picture buffer and assigning an inter-view reference index to each inter-view reference picture, the inter-view reference index identifying the inter-view reference picture in the initialized reference picture list used for inter-view prediction of a block to be decoded in the random access picture, the assigning being performed using inter-view reference information, the block to be decoded having a same time with the inter-view reference pictures and a different view from the inter-view reference pictures, the inter-view reference information including view number information and view identification information, the view number information indicating a number of the inter-view reference pictures referred for inter-view prediction of the random access picture, the view identification information identifying to which of the plurality of views each of the inter-view reference pictures belongs, the random access picture and at least one of the inter-view reference pictures included in the initialized reference picture list having a same picture order count;

obtaining, with the decoding apparatus, modification information for the initialized reference picture list from the multi-view video data stream, the modification information indicating that the inter-view reference picture is reordered;

obtaining, with the decoding apparatus, an assignment modification value for changing the inter-view reference index assigned to the inter-view reference picture in the initialized reference picture list according to the modification information; and

modifying, with the decoding apparatus, the initialized reference picture list of the random access slice, the modifying including reordering the inter-view reference picture by changing the inter-view reference index assigned to the inter-view reference picture based on the assignment modification value,

wherein the inter-view reference picture is identified based on picture identification information indicating a view identifier of the inter-view reference picture.

2. The method of claim 1 , wherein the inter-view reference picture is appended to a temporal reference picture for temporal prediction.

3. The method of claim 2 , wherein the temporal reference picture for temporal prediction and the inter-view reference picture for interview prediction are managed as one reference picture list.

4. The method of claim 1 , wherein the inter-view prediction information has been obtained from a Network Abstraction Layer (NAL) header extension information of multi-view video data.

5. The method of claim 1 , wherein the multi-view video data stream includes a video data of a base view independent of other views, the base view being a view decoded without using inter-view prediction.

6. The method of claim 1 , wherein the inter-view reference index of the inter-view reference picture is changed by performing a subtraction operation or an addition operation according to the modification information.

7. The method of claim 1 , wherein the modification information is obtained from a slice header of multi-view video data.

8. An apparatus for managing a reference picture, comprising:

a parsing unit configured to receive a multi-view video data stream, the multi-view video stream including video data for each of a plurality of views, each of the plurality of views corresponding to a different spatial angle, the multi-view video data stream including a random access picture, the random access picture including a random access slice, the random access slice referencing only a slice corresponding to a same time and a different view of the random access picture;

a reference picture list initializing unit configured to initialize a reference picture list of the random access slice for inter-view prediction, the initializing including ordering inter-view reference pictures for the random access picture in a decoded picture buffer and assigning an inter-view reference index to each inter-view reference picture, the inter-view reference index identifying an inter-view reference picture in the initialized reference picture list used for inter-view prediction of a block to be decoded in the random access picture, the assigning being performed using inter-view reference information, the block to be decoded having a same time with the inter-view reference pictures and a different view from the inter-view reference pictures, the inter-view reference information including view number information and view identification information, the view number information indicating a number of the inter-view reference pictures referred for inter-view prediction of the random access picture, and the view identification information identifying to which of the plurality of views each of the inter-view reference pictures belongs, the random access picture and at least one of the inter-view reference pictures included in the initialized reference picture list having a same picture order count;

a reference picture list modifying unit configured to obtain modification information for the initialized reference picture list from the multi-view video data stream, the modification information indicating that the inter-view reference picture is reordered;

the reference picture list modifying unit configured to obtain an assignment modification value for changing the inter-view reference index assigned to the inter-view reference picture in the initialized reference picture list according to the modification information; and

the reference picture list modifying unit configured to modify the initialized reference picture list of the random access slice, the modifying including reordering the inter-view reference picture by changing the inter-view reference index assigned to the inter-view reference picture based on the assignment modification value,

wherein the inter-view reference picture is identified based on picture identification information indicating a view identifier of the inter-view reference picture.

9. The apparatus of claim 8 , wherein a temporal reference picture for temporal prediction and the inter-view reference picture for interview prediction are managed as one reference picture list.

10. The apparatus of claim 8 , wherein the inter-view prediction information has been obtained from a Network Abstraction Layer (NAL) header extension information of multi-view video data.

11. The apparatus of claim 8 , wherein the multi-view video data stream includes video data of a base view independent of other views, the base view being a view decoded without using inter-view prediction.

12. The apparatus of claim 8 , wherein the inter-view reference index of the inter-view reference picture is changed by performing a subtraction operation or an addition operation according to the modification information.

13. The apparatus of claim 8 , wherein the modification information is obtained from a slice header of multi-view video data.