Video decoding apparatus, video decoding method, and storage medium

摘要

A video decoding apparatus includes a reference picture list storing unit configured to store picture information of pictures; a motion vector information storing unit configured to store motion vector information including motion vectors of blocks that are spatially and temporally adjacent to a target block to be decoded and reference picture identifiers indicating pictures that the motion vectors refer to; and a vector predictor generating unit configured to scale a vector predictor candidate for a motion vector of the target block based on the picture information and the motion vector information and to correct the scaled vector predictor candidate toward 0 by a predetermined amount.

主权项

1. A video decoding apparatus, comprising:
a reference picture list storing unit configured to store picture information of pictures; a motion vector information storing unit configured to store motion vector information including motion vectors of blocks that are spatially or temporally adjacent to a target block to be decoded and reference picture identifiers indicating pictures that the motion vectors refer to; and a vector predictor generating unit configured to scale a vector predictor candidate for a motion vector of the target block based on the picture information and the motion vector information and to correct the scaled vector predictor candidate toward 0 by a predetermined amount, wherein the vector predictor generating unit includes
a scaling factor calculation unit configured to calculate a scaling factor based on the picture information and the motion vector information; anda scaling operation unit configured to scale the vector predictor candidate by the scaling factor and to correct the scaled vector predictor candidate by the predetermined amount, the scaling factor has a predetermined precision after a decimal point, and the scaling operation unit includes
a scaling unit configured to multiply the vector predictor candidate by the scaling factor to scale the vector predictor candidate and increase a precision after the decimal point of the scaled vector predictor candidate to the predetermined precision after the decimal point;a correcting unit configured to correct the scaled vector predictor candidate toward 0 by the predetermined amount; andan adjusting unit configured to round the scaled and corrected vector predictor candidate to nearest integers.