This disclosure relates generally to video coding and particularly to methods and systems for selection of interpolation filters for generation of inter-prediction blocks based on motion vector magnitude and/or motion vector pixel resolution. For example, a method for processing a video block of a video stream is disclosed. The method may include receiving a flag from the video stream; determining based on the received flag that the video block is to be inter-predicted by a reference frame according to a motion vector (MV); deriving the MV from a reference MV and an MVD (MV difference) of the video block; deriving a signal indicating an interpolation filter, wherein the signal is based at least on one of a resolution and a magnitude of the MVD; selecting the interpolation filter according to the signal; and performing inter prediction for the video block from the reference frame according to the MV and the selected interpolation filter

This disclosure relates generally to video coding and particularly to methods and systems for selection of interpolation filters for generation of inter-prediction blocks based on motion vector magnitude and/or motion vector pixel resolution. For example, a method for processing a video block of a video stream is disclosed. The method may include receiving a flag from the video stream; determining based on the received flag that the video block is to be inter-predicted by a reference frame according to a motion vector (MV); deriving the MV from a reference MV and an MVD (MV difference) of the video block; deriving a signal indicating an interpolation filter, wherein the signal is based at least on one of a resolution and a magnitude of the MVD; selecting the interpolation filter according to the signal; and performing inter prediction for the video block from the reference frame according to the MV and the selected interpolation filter

A motion compensation module can be used in a video encoder for encoding a video input signal that includes a sequence of images that are segmented into a plurality of macroblocks. The motion compensation module includes a motion search module that generates a motion search motion vector for a plurality of subblocks for a plurality of partitionings of a macroblock of a plurality of macroblocks and generates a selected group of the plurality of partitionings based on a group selection signal. A motion refinement module—generates a refined motion vector for the plurality of subblocks for the selected group of the plurality of partitionings of the macroblock of the plurality of macroblocks, based on the motion search motion vector for each of the plurality of subblocks of the macroblock of the plurality of macroblocks.

A motion compensation module can be used in a video encoder for encoding a video input signal that includes a sequence of images that are segmented into a plurality of macroblocks. The motion compensation module includes a motion search module that generates a motion search motion vector for a plurality of subblocks for a plurality of partitionings of a macroblock of a plurality of macroblocks and generates a selected group of the plurality of partitionings based on a group selection signal. A motion refinement module—generates a refined motion vector for the plurality of subblocks for the selected group of the plurality of partitionings of the macroblock of the plurality of macroblocks, based on the motion search motion vector for each of the plurality of subblocks of the macroblock of the plurality of macroblocks.

A method and apparatus for evaluating video quality are disclosed. An apparatus for evaluating video quality according to an embodiment of the invention includes: an encoder unit that converts a first-resolution original video sequence into a second-resolution original video sequence and encodes the second-resolution original video sequence; decoder unit that generates a second-resolution decoded video sequence by decoding the encoded second-resolution video sequence and converts the second-resolution decoded video sequence into a first-resolution decoded video sequence by interpolating the second-resolution decoded video sequence to the first resolution; a video quality index calculator unit that calculates a first video quality index by comparing the first-resolution original video sequence with the first-resolution decoded video sequence and calculates a second video quality index by comparing the second-resolution original video sequence with the second-resolution decoded video sequence; and a video quality evaluator unit that calculates a final video quality index by using the first video quality index and the second video quality index.

A method and apparatus for evaluating video quality are disclosed. An apparatus for evaluating video quality according to an embodiment of the invention includes: an encoder unit that converts a first-resolution original video sequence into a second-resolution original video sequence and encodes the second-resolution original video sequence; decoder unit that generates a second-resolution decoded video sequence by decoding the encoded second-resolution video sequence and converts the second-resolution decoded video sequence into a first-resolution decoded video sequence by interpolating the second-resolution decoded video sequence to the first resolution; a video quality index calculator unit that calculates a first video quality index by comparing the first-resolution original video sequence with the first-resolution decoded video sequence and calculates a second video quality index by comparing the second-resolution original video sequence with the second-resolution decoded video sequence; and a video quality evaluator unit that calculates a final video quality index by using the first video quality index and the second video quality index.

Systems and methods for integrated graphics rendering are disclosed. In certain embodiments, the systems and methods utilize a graphics engine, a video encoding engine, and remote client coding engine to render graphics over a network. The systems and methods involve the generation of per-pixel motion vectors, which are converted to per-block motion vectors at the graphics engine. The graphics engine injects these per-block motion vectors into a video encoding engine, such that the video encoding engine may convert those vectors into encoded video data for transmission to the remote client coding engine.

A video coder that uses a shared candidate list to encode or decode multiple blocks of pixels within a shared boundary is provided. The video coder identifies a shared boundary encompassing a plurality of blocks of pixels of a current picture in a video sequence. The video coder identifies one or more prediction candidates as a shared candidate list based on neighbors of a region defined by the shared boundary. The video coder codes one or more blocks of pixels encompassed by the shared boundary by using one or more prediction candidates selected from the shared candidate list.

A video coder that uses a shared candidate list to encode or decode multiple blocks of pixels within a shared boundary is provided. The video coder identifies a shared boundary encompassing a plurality of blocks of pixels of a current picture in a video sequence. The video coder identifies one or more prediction candidates as a shared candidate list based on neighbors of a region defined by the shared boundary. The video coder codes one or more blocks of pixels encompassed by the shared boundary by using one or more prediction candidates selected from the shared candidate list.

The present invention relates to a scalable video coding method and apparatus using inter prediction mode. A decoding method includes determining motion information prediction mode on a target decoding block of an enhancement layer, predicting motion information on the target decoding block of the enhancement layer using motion information on the neighboring blocks of the enhancement layer, if the determined motion information prediction mode is a first mode, and predicting the motion information on the target decoding block of the enhancement layer using motion information on a corresponding block of a reference layer, if the determined motion information prediction mode is a second mode.