Method and apparatus for encoding and decoding motion vector of multi-view video

A method of encoding a motion vector of a multi-view video, the method comprising:

• determining a time direction motion vector of a current block to be encoded by performing motion prediction on the current block with reference to a first frame having a first view that is a same as a view of the current block;
• determining time direction motion vector predictor candidates using a time direction motion vector of an adjacent block that refers to a reference frame having the first view and that is from among adjacent blocks of the current block, and a time direction motion vector of a corresponding region included in a second reference frame having a different view from the current block and a same POC as the current block;
• and
• encoding a difference value between the time direction motion vector of the current block and a time direction motion vector predictor selected from among the determined time direction motion vector predictor candidates, and mode information about the selected time direction motion vector predictor.

A method of decoding a motion vector of a multi-view video, the method comprising:

• decoding information about a motion vector predictor of a current block, and a difference value between a motion vector of the current block and the motion vector predictor of the current block;
• determining the motion vector predictor of the current block based on the decoded information about the motion vector predictor of the current block;
• and
• restoring the motion vector of the current bock based on the determined motion vector predictor and the decoded difference value,
• wherein the motion vector predictor is selected from among view direction motion vector predictor candidates that are determined using a view direction motion vector of an adjacent block that refers to a reference frame having a different view from the first view and that is from among adjacent blocks of the current block, and a view direction motion vector of a corresponding region included in a second reference frame having the first view and a different picture order count (POC) than the current frame, according to index information comprised in the information about the motion vector predictor.

A method of decoding a motion vector of a multi-view video, the method comprising:

• decoding information about a motion vector predictor of a current block, and a difference value between the motion vector of the current block and the motion vector predictor of the current block;
• determining the motion vector predictor of the current block based on the decoded information about the motion vector predictor of the current block;
• and
• restoring the motion vector of the current bock based on the determined motion vector predictor and the decoded difference value,
• wherein the motion vector predictor is selected from among time direction motion vector predictor candidates that are determined by using a time direction motion vector of an adjacent block that refers to a reference frame having the first view and that is from among adjacent blocks of the current block, and a time direction motion vector of a corresponding region included in a second reference frame having a different view from the current block and a same POC as the current block, according to index information comprised in the information about the motion vector predictor.

An apparatus for decoding a motion vector of a multi-view video, the apparatus comprising:

• a motion vector decoding unit which decodes information about a motion vector predictor of a current block, and a difference value between the motion vector of the current block and the motion vector predictor of the current block;
• and
• a motion compensation unit which determines the motion vector predictor of the current block based on the decoded information about the motion vector predictor of the current block, and restores the motion vector of the current bock based on the determined motion vector predictor and the decoded difference value,
• wherein the motion vector predictor is selected from among time direction motion vector predictor candidates that are determined using a time direction motion vector of an adjacent block that refers to a reference frame having the first view and that is from among adjacent blocks of the current block, and a time direction motion vector of a corresponding region included in a second reference frame having a different view from the current block and a same POC as the current block, according to index information comprised in the information about the motion vector predictor.