VIDEO ENCODER AND VIDEO ENCODING METHOD

摘要

The video encoder includes: a refresh boundary determination unit which determines a position of a boundary in a second picture to be encoded based on a position of a boundary between a refreshed region and an unrefreshed region in a first picture which have been encoded and a refresh update size; and a restriction block identification unit which identifies, as a first restriction target sub-block which does not utilize a prediction vector, a first sub-block being a unit of motion compensation which is included in a refreshed region of the second picture and is possible to select a motion vector of a sub-block in the unrefreshed region of the first picture as a prediction vector of the motion vector, based on the positions of the boundaries of the first and the second pictures.

主权项

1. A video encoder which encodes a plurality of pictures included in a video in an intra-refresh scheme comprising:
a refresh boundary determination unit which determines, according to a position of a boundary between a refreshed region through which a slice to which an intra-refresh is applied has traversed and an unrefreshed region through which the slice to which the intra-refresh is applied has not traversed, in a first picture, which has been encoded, among the plurality of pictures, and a refresh update size being a ratio of a size of the pictures in a moving direction of the boundary to a refresh cycle, a position of the boundary in a second picture, which is an encoding target, subsequent to the first picture; a restriction block identification unit which identifies, based on the position of the boundary of the first picture and the position of the boundary of the second picture, among a plurality of first sub-blocks being units of motion compensation included in the second picture, as a first restriction target sub-block, a first sub-block which is included in the refreshed region in the second picture and is possible to select a motion vector of a sub-block included in the unrefreshed region of the first picture as a prediction vector of the motion vector of the first sub-block when the first sub-block is encoded in an inter prediction coding mode referring to another encoded picture; a prediction encoding unit which generates encoded data by encoding, among a plurality of second sub-blocks which are obtained by dividing the second picture and are units to be applied in the inter prediction coding mode or in an intra prediction coding mode in which only a coding target picture is referred to, a second restriction target sub-block, which is a second sub-block including the first restriction target sub-block, in the inter prediction coding mode without using the prediction vector with respect to the first restriction target sub-block, or by encoding the second restriction target sub-block in the intra prediction coding mode; and an entropy encoding unit which entropy-encodes the encoded data.