Method and an apparatus for processing a video signal

An apparatus configured to decode a bitstream for a video signal, the apparatus comprising:

• a decoding apparatus configured to:
• obtain motion vector indication information from the bitstream, the motion vector indication information indicating a motion vector predictor for a current block;
• obtain a first spatial motion vector candidate from a first neighboring block adjacent to the current block;
• obtain a second spatial motion vector candidate from a second neighboring block adjacent to the current block;
• determine the motion vector predictor for the current block to be a motion vector candidate indicated by the motion vector indication information from among a motion vector candidate set of the current block, the motion vector candidate set including the first spatial motion vector candidate and the second spatial motion vector candidate;
• and
• decoding the current block based on the motion vector predictor,
• wherein the first spatial motion vector candidate is obtained by scaling a motion vector of the first neighboring block based on a difference between a reference picture number of the current block and a current picture number of the current block and a difference between a reference picture number of the first neighboring block and the current picture number when a reference picture of the current block is different from a reference picture of the first neighboring block, and
• wherein the second spatial motion vector candidate is obtained by scaling a motion vector of the second neighboring block based on the difference between the reference picture number of the current block and the current picture number and a different between a reference picture number of the second neighboring block and the current picture number when the reference picture of the current block is different from a reference picture of the second neighboring block.

A method of encoding a bitstream for a video signal by an encoding apparatus, the method comprising:

• obtaining, by the encoding apparatus, a first spatial motion vector candidate from a first neighboring block adjacent to a current block;
• obtaining, by the encoding apparatus, a second spatial motion vector candidate from a second neighboring block adjacent to the current block;
• encoding, by the encoding apparatus, motion vector indication information into the bitstream, the motion vector indication information indicating a motion vector candidate corresponding to a motion vector predictor for the current block from among a motion vector candidate set of the current block, the motion vector candidate set including the first spatial motion vector candidate and the second spatial motion vector candidate;
• and
• encoding, by the encoding apparatus, the current block based on the motion vector predictor,
• wherein the first spatial motion vector candidate is obtained by scaling a motion vector of the first neighboring block based on a difference between a reference picture number of the current block and a current picture number of the current block and a difference between a reference picture number of the first neighboring block and the current picture number when a reference picture of the current block is different from a reference picture of the first neighboring block, and
• wherein the second spatial motion vector candidate is obtained by scaling a motion vector of the second neighboring block based on the difference between the reference picture number of the current block and the current picture number and a different between a reference picture number of the second neighboring block and the current picture number when the reference picture of the current block is different from a reference picture of the second neighboring block.

An apparatus configured to encode a bitstream for a video signal, the apparatus comprising:

• an encoding apparatus configured to:
• obtain a first spatial motion vector candidate from a first neighboring block adjacent to a current block;
• obtain a second spatial motion vector candidate from a second neighboring block adjacent to the current block;
• encode motion vector indication information into the bitstream, the motion vector indication information indicating a motion vector candidate corresponding to a motion vector predictor for the current block from among a motion vector candidate set of the current block, the motion vector candidate set including the first spatial motion vector candidate and the second spatial motion vector candidate;
• and
• encode the current block based on the motion vector predictor,
• wherein the first spatial motion vector candidate is obtained by scaling a motion vector of the first neighboring block based on a difference between a reference picture number of the current block and a current picture number of the current block and a difference between a reference picture number of the first neighboring block and the current picture number when a reference picture of the current block is different from a reference picture of the first neighboring block, and
• wherein the second spatial motion vector candidate is obtained by scaling a motion vector of the second neighboring block based on the difference between the reference picture number of the current block and the current picture number and a different between a reference picture number of the second neighboring block and the current picture number when the reference picture of the current block is different from a reference picture of the second neighboring block.