Patent ID: 9363512
Filing Date: 2016-06-07
CPC Classification: H04N

Claim Text:
1. A method of decoding a bitstream of inter-coded video using sign bit hiding, wherein a prediction block in a reference frame is specified by a motion vector, the bitstream encoding a horizontal motion vector difference component and a vertical motion vector difference component, wherein the motion vector is determined, in the decoder, based on a predicted motion vector adjusted by the horizontal motion vector difference component and the vertical motion vector difference component, the method comprising: decoding a part of the bitstream to reconstruct a magnitude of one of the motion vector difference components and to reconstruct a magnitude of the other of the motion vector difference components; determining a parity by summing said magnitude of the one of the motion vector difference components and said magnitude of the other of the motion vector difference components to obtain said parity; inferring a sign for said one of the motion vector difference components based on whether said parity is even or odd; and assigning the sign to said magnitude to reconstruct said one of the motion vector difference components.