Method and apparatus for image encoding/decoding

An apparatus for decoding a video, the apparatus comprising:

• an inter prediction unit deriving a spatial merge candidate from at least one of spatial candidate blocks of a current block, deriving a temporal merge candidate from a co-located block of the current block, and generating a prediction block of the current block based on at least one of the derived spatial merge candidate and the derived temporal merge candidate,
• wherein the inter prediction unit selects a reference picture for the temporal merge candidate based on a reference picture list of a current picture including the current block and a reference picture list of a co-located picture including the co-located block.

An apparatus for encoding a video, the apparatus comprising:

• an inter prediction unit deriving a spatial merge candidate from at least one of spatial candidate blocks of a current block, deriving a temporal merge candidate from a co-located block of the current block, and generating a prediction block of the current block based on at least one of the derived spatial merge candidate and the derived temporal merge candidate,
• wherein the inter prediction unit selects a reference picture for the temporal merge candidate based on a reference picture list of a current picture including the current block and a reference picture list of a co-located picture including the co-located block.

A readable medium storing a bitstream formed by a method for encoding a video, the method including:

• deriving a spatial merge candidate from at least one of spatial candidate blocks of a current block;
• deriving a temporal merge candidate from a co-located block of the current block;
• and generating a prediction block of the current block based on at least one of the derived spatial merge candidate and the derived temporal merge candidate, wherein a reference picture for the temporal merge candidate is selected based on a reference picture list of a current picture including the current block and a reference picture list of a co-located picture including the co-located block.