Processing multiview video
Decoding a multiview video signal comprises receiving a bitstream comprising the multiview video signal encoded according to dependency relationships between respective views, and view-dependency information representing the dependency relationships in a two-dimensional data structure; extracting the two-dimensional data structure and determining the dependency relationships from the extracted data structure; and decoding the multiview video signal according to the determined dependency relationships.
1. A method for decoding multi-view video data in a multi-view video data stream, with a decoder, the method comprising:
obtaining, with a Network Abstraction Layer parsing unit, inter-view prediction structure information of a random access picture and a non-random access picture from a sequence area in the multi-view video data stream, the inter-view prediction structure information including number information and view identification information, the number information indicating a total number of views in the multi-view video data, and the view identification information providing a view identifier of each reference view in the multi-view video data as two dimension structure;
obtaining, with the Network Abstraction Layer parsing unit, a random access flag for inter-view prediction, the random access flag indicating whether a type of a current picture represents the random access picture or the non-random access picture, all slices in the random access picture referring only to slices having a same temporal position and being in a different view of the multi-view video data, the non-random access picture representing a picture other than the random access picture;
determining, with a decoded picture buffer unit, a reference picture list of a current slice in the current picture for inter-view prediction using the inter-view prediction structure information of the non-random access picture, when the current picture corresponds to the non-random access picture based on the random access flag;
determining, with an inter-prediction unit, a prediction value of a macroblock in the current slice based on the determined reference picture list for inter-view prediction; and
decoding the macroblock in the current slice using the prediction value,
wherein the decoder includes the Network Abstraction Layer parsing unit, the decoded picture buffer unit, and the inter-prediction unit.
2. The method of claim 1 , wherein the inter-view prediction structure information includes number information and view identification information, the number information indicating a total number of views in the multi-view video data, and the view identification information providing a view identifier of each reference view in the multi-view video data.
3. The method of claim 1 , wherein the inter-view prediction structure information of the non-random access picture is obtained by considering a predictive direction.
4. The method of claim 3 , wherein the predictive direction represents a forward direction or a backward direction in the output order information.
5. The method of claim 1 , wherein the inter-view prediction structure information is obtained from a sequence parameter set information of a multi-view video.
6. An apparatus for decoding a multi-view video data in a multi-view video data stream, comprising:
a Network Abstraction Layer parsing unit obtaining identification information representing the multi-view video data stream including inter-view prediction structure information, and obtaining inter-view picture structure information of a non-random access picture from the multi-view video data stream based on the identification information, the non-random access picture representing a picture other than an random access picture, obtaining random access flag from the multi-view video data stream, the random access flag indicating whether a type of a current picture is the random access picture, all slices in the random access picture referring only slices having a same temporal position and being in a different view of the multi-view video data;
an inter-prediction unit deriving a prediction value of the current picture using the inter-view prediction structure information of the non-random access picture, and a decoding unit decoding the current picture using the prediction value,
wherein the current picture corresponds to the non-random access picture,
wherein the inter-view prediction structure information indicates reference relation between a plurality of views.
7. The apparatus of claim 6 , wherein the inter-view prediction structure information includes number information and view identification information, the number information indicating a total number of views in the multi-view video data, and the view identification information providing a view identifier of each reference view in the multi-view video data.
8. The apparatus of claim 6 , wherein the inter-view prediction structure information of the non-random access picture is obtained by considering a predictive direction.
9. The apparatus of claim 8 , wherein the predictive direction represents a forward direction or a backward direction in an output order of pictures.
10. The apparatus of claim 6 , wherein the inter-view prediction structure information is obtained from a sequence parameter set information of a multi-view video.