Scalable video signal encoding/decoding method and apparatus

Abstract

A scalable video signal decoding method according to the present invention comprises determining a corresponding picture of a reference layer used for inter-layer prediction of a current picture within a current layer, generating an interlayer reference picture by up-sampling the determined corresponding picture, generating a reference picture list including the interlayer reference picture, and performing an inter prediction of the current picture on the basis of the reference picture list.

1 - 15 . (canceled) 
     
     
         16 . A method for decoding a video signal by a decoding apparatus, the method comprising:
 determining, based on inter-layer reference information relating to a current picture of a current layer, a corresponding picture of a reference layer to be used for inter-layer prediction of the current picture;   generating an inter-layer reference picture by up-sampling the determined corresponding picture;   generating a reference picture list based on the inter-layer reference picture; and   performing inter prediction for the current picture based on the reference picture list.   
     
     
         17 . The method of  claim 16 , wherein the corresponding picture is determined based on whether or not the corresponding picture belongs to a same access unit as the current picture. 
     
     
         18 . The method of  claim 17 , wherein the inter-layer reference picture includes at least one a first inter-layer reference picture and a second inter-layer reference picture, and
 wherein the first inter-layer reference picture is representative of a reference picture on which a filtering is performed on a integer position thereof, and the second inter-layer reference picture is representative of a reference picture on which the filtering is not performed on the integer position thereof.   
     
     
         19 . The method of  claim 18 , wherein when a reference picture relating to a current block included in the current picture is determined to be the inter-layer reference picture, a motion vector of the current block is set equal to (0,0). 
     
     
         20 . The method of  claim 16 , the method further comprising:
 obtaining a reference active flag from a bitstream, the reference active flag indicating whether a restriction that corresponding pictures of all layers having a direct dependency with the current layer are used for inter-layer prediction of the current picture is applied or not; and   obtaining the inter-layer reference information based on the reference active flag.   
     
     
         21 . The method of  claim 20 , wherein the inter-layer reference information includes at least one of an inter-layer prediction flag, number information of reference pictures, or a reference layer identifier. 
     
     
         22 . The method of  claim 21 , wherein the inter-layer prediction flag indicates whether the inter-layer prediction is used for decoding the current picture, the number information of the reference pictures indicates a number of corresponding pictures to be used for the inter-layer prediction of the current picture, and the reference layer identifier is a layer identifier of each of layers including the corresponding pictures to be used for the inter-layer prediction of the current picture. 
     
     
         23 . The method of  claim 22 , wherein the reference layer identifier is obtained only when the number of the corresponding pictures to be used for the inter-layer prediction of the current picture is different from a number of layers having the direct dependency with the current layer.