Method and apparatus for rounding coordinate value of non-integer pixel position motion vector

A method for rounding a coordinate value of a non-integer pixel position motion vector of a frame of digital video data, the method comprising:

• performing a rounding operation, by a computer device, on a coordinate value of a non-integer pixel position motion vector of the frame of digital video data, wherein the rounding operation comprises:
• for each dimension of coordinates of the non-integer pixel position motion vector, when a coordinate in the dimension is a non-integer pixel position, rounding the coordinate value of the non-integer pixel position motion vector in the dimension to one of integer pixel coordinate positions A and B if distances from the coordinate of the non-integer pixel position motion vector in the dimension to the integer pixel coordinate positions A and B adjacent to the non-integer pixel position in the dimension are the same,
• wherein an integer pixel coordinate position is determined by a sign of the coordinate value of the non-integer pixel position motion vector in the dimension.