Method and apparatus for coding multi-view video, and method and apparatus for decoding multi-view video

A multiview video decoding apparatus comprising:

• a parser configured to obtain, from a bitstream, motion inheritance information specifying whether or not motion information of a corresponding block of a first layer which corresponds to a current block of a second layer is available as motion information of the second layer, prediction mode information of the current block, and merge index information indicating a merge candidate from among merge candidates included in a merge candidate list and is to be used in predicting the current block;
• and
• an inter predictor configured to obtain the merge candidate list including, as a merge candidate, the motion information of the corresponding block, when a prediction mode of the current block is a merge mode, and the motion inheritance information indicates that the motion information of the corresponding block is available as the motion information of the second layer, and to obtain motion information of the current block, based on the merge index information,
• wherein the merge inheritance information is a motion parameter inheritance flag (MPI_flag) indicating whether or not an MPI candidate from among the merge candidates is used, and
• the obtaining of the merge candidate list comprises determining, by using the MPI_flag, whether or not to comprise the MPI candidate in the merge candidate list.

A multiview video encoding method comprising:

• determining whether motion information of a corresponding block of a first layer which corresponds to a current block of a second layer is available as motion information of the second layer;
• when the motion information of the corresponding block is available as the motion information of the second layer, determining a merge candidate list including, as a merge candidate, the motion information of the corresponding block;
• performing inter prediction on the current block by using merge candidates comprised in the merge candidate list, and determining, from among the merge candidates, a merge candidate to be used in predicting the current block;
• and
• adding, to a bitstream, motion inheritance information including whether the motion information of the corresponding block of the first layer is available as the motion information of the second layer, prediction mode information related to the current block, and merge index information indicating the determined merge candidate,
• wherein:
• the determining of the merge candidate list comprises determining whether or not to form the merge candidate list by using a motion parameter inheritance (MPI) candidate, and
• the adding comprises adding, to the bitstream, information that is an MPI_flag indicating whether or not the MPI candidate is used as the merge candidate.