Method and apparatus for coding video, and method and apparatus for decoding video accompanied by inter prediction using collocated image

A method of video decoding, the method comprising:

• when prediction of a collocated block of a current block is available by using a reference list L0 of the collocated block, determining a motion vector predictor candidate using an L0 motion vector of the collocated block corresponding to a reference picture determined from the reference list L0 of the collocated block;
• when prediction of the collocated block is available by using a reference list L1 of the collocated block, determining the motion vector predictor candidate using an L1 motion vector of the collocated block corresponding to a reference picture determined from the reference list L1 of the collocated block;
• when prediction of the collocated block of the current block is available by using the reference list L0 of the collocated block and prediction of the collocated block is available by using the reference list L1 of the collocated block, and when reference pictures of the current block are to be output prior to a current picture including the current block, determining the motion vector predictor candidate using a motion vector corresponding to a reference list of the current block, among the L0 motion vector of the collocated block according to the reference list L0 and the L1 motion vector of the collocated block according to the reference list L1;
• and
• obtaining a motion vector predictor of the current bock among predictor candidates including the determined motion vector predictor candidate,
• wherein the reference list of the current block is at least one of a reference list L0 of the current block and a reference list L1 of the current block.