Video signal processing method and device for processing motion vector difference information for inter prediction in video signal

A method for encoding motion vector difference (MVD) information for inter prediction in a video signal, the method comprising:

• determining an MVD based on a motion vector of a current block and a motion vector of a neighboring block;
• and
• encoding coding information for the MVD,
• wherein the coding information for the MVD includes a first flag indicating whether the MVD is greater than a first value, a second flag coded based on the first flag and indicating whether the MVD is greater than a second value, and size information for the MVD,
• wherein the size information for the MVD is coded based on a first difference value corresponding to a difference between the second value and the first value based on the MVD being equal to or less than the second value,
• wherein encoding the coding information for the MVD includes encoding a third flag indicating whether the MVD is greater than a third value based on the MVD being greater than the second value, and
• wherein a second difference value corresponding to a difference between the third value and the second value is greater than the first difference value.

A non-transitory computer-readable medium storing encoded picture information generated by performing the steps of:

• determining a motion vector difference (MVD) based on a motion vector of a current block and a motion vector of a neighboring block;
• and
• encoding coding information for the MVD,
• wherein the coding information for the MVD includes a first flag indicating whether the MVD is greater than a first value, a second flag coded based on the first flag and indicating whether the MVD is greater than a second value, and size information for the MVD,
• wherein the size information for the MVD is coded based on a first difference value corresponding to a difference between the second value and the first value based on the MVD being equal to or less than the second value,
• wherein encoding the coding information for the MVD includes encoding a third flag indicating whether the MVD is greater than a third value based on the MVD being greater than the second value, and
• wherein a second difference value corresponding to a difference between the third value and the second value is greater than the first difference value.