View synthesis mode for three-dimensional video coding

摘要

A video encoder signals, in a bitstream, a syntax element that indicates whether a current video unit is predicted from a VSP picture. The current video unit is a macroblock or a macroblock partition. The video encoder determines, based at least in part on whether the current video unit is predicted from the VSP picture, whether to signal, in the bitstream, motion information for the current video unit. A video decoder decodes the syntax element from the bitstream and determines, based at least in part on the syntax element, whether the bitstream includes the motion information.

主权项

1. A method of decoding video data, the method comprising:
determining whether a current video unit of the video data is coded using a first mode, wherein the current video unit is either a macro block (MB) or an MB partition of a current texture view component of a current view of a current access unit; when the current video unit is coded using the first mode:
determining a reference view picture for view synthesis prediction, wherein the reference view picture is in the current access unit and is in a view indicated in a slice header as being a view for view synthesis;setting a reference index for the current video unit such that the reference index indicates the reference view picture; andderiving, from either a depth map or disparity motion vectors of one or more blocks that spatially or temporally neighbor the current video unit, a motion vector for the current video unit, wherein the motion vector for the current video unit refers to the reference view picture and the motion vector for the current video unit is not equal to 0, wherein deriving the motion vector comprises:
determining a representative depth value;converting the representative depth value to a disparity vector; andsetting the motion vector for the current video unit equal to the disparity vector; when the current video unit is coded using a second mode, decoding, from the bitstream, the reference index for the current video unit and a motion vector difference for the current video unit; generating a predictive block for the current video unit based on a reference block indicated by motion information of the current video unit, the motion information of the current video unit including the motion vector for the current video unit and the reference index for the current video unit; and adding the predictive block to a residual block to construct a sample block of the current video unit.