Method and apparatus for processing video signal

A method of encoding an image, comprising:

• generating a first candidate list for determining motion information of a current block in the image, the first candidate list including a plurality of candidates, the plurality of candidates including at least one of a first spatial candidate of a left neighboring block or a second spatial candidate of a top neighboring block;
• determining the motion information of the current block based on one of the plurality of candidates in the first candidate list, the motion information of the current block being determined based on the first candidate list;
• and
• performing inter prediction on the current block using the determined motion information,
• wherein index information indicating the one of the plurality of candidates is encoded into a bitstream,
• wherein generating the first candidate list comprises adding at least one candidate in a second candidate list to the first candidate list,
• wherein the second candidate list includes candidates having motion information of blocks encoded by inter prediction before the current block,
• wherein an index assigned to a first candidate, stored first in the second candidate list, is smaller than an index assigned to a second candidate, stored in the second candidate list later than the first candidate, and
• wherein the second spatial candidate of the top neighboring block is added to the first candidate list with a higher priority than the first spatial candidate of the left neighboring block.

A non-transitory computer readable medium having stored thereon a compressed video data, the compressed video data comprising:

• index information indicating one of a plurality of candidates included in a first candidate list of a current block,
• wherein the plurality of candidates includes at least one of a first spatial candidate of a left neighboring block or a second spatial candidate of a top neighboring block,
• wherein motion information of the current block is determined based on the first candidate list and the index information,
• wherein the motion information of the current block is used to perform inter prediction on the current block,
• wherein at least one candidate in a second candidate list is added to the first candidate list,
• wherein the second candidate list includes candidates having motion information of blocks encoded by inter prediction before the current block,
• wherein an index assigned to a first candidate, stored first in the second candidate list, is smaller than an index assigned to a second candidate, stored in the second candidate list later than the first candidate, and
• wherein the second spatial candidate of the top neighboring block is added to the first candidate list with a higher priority than the first spatial candidate of the left neighboring block.