Method of motion vector predictor or merge candidate derivation in video coding

Abstract

A method and apparatus for deriving directional-priority based candidates for a block coded in Inter, or Merge or Skip mode are disclosed. One or more motion vectors associated with one or more previously coded blocks for a current block are determined first. One or more directional-priority based candidates for the current block are derived by searching through the previously coded blocks according to a priority order associated with prediction direction of the motion vectors. The motion vectors having a first prediction direction are selected with a higher priority than the motion vectors having a second prediction direction. The derived directional-priority based candidates are inserted into a candidate list. The motion vector predictor (MVP) or Merge / Skip candidate is selected from the candidate list for coding the current block in Inter, or Merge or Skip mode.

Description

[0001] cross reference [0002] This application claims priority to US Provisional Patent Application No. 62 / 089,352, filed December 9, 2014. These patent applications are hereby incorporated by reference in their entirety. technical field [0003] The present invention relates to video coding, in particular to the derivation of motion vector predictors or merging candidates in video coding. Background technique [0004] The development of digital video coding standards over the past decade has enabled the success of multimedia systems such as smart phones, digital televisions and digital cameras. After the standardization activities of H.261, MPEG-1, MPEG-2, H.263, MPEG-4 and H.264 / AVC, due to the need for greater image resolution, higher frame rate and better video quality, the need to improve video compression performance remains strong. Therefore, efforts continue to develop new video coding techniques to improve H.264 / AVC coding efficiency. HEVC is based on a motion...

AI Technical Summary

Problems solved by technology

When a temporal motion candidate is included in the candidate list and if one motion vector of the previous picture cannot be correctly decoded, a mismatch of the candidate list between the encoder side and the decoder side may occur, which may lead to a candidate index parsing error

This parsing error can propagate and have a severe impact on video quality because the rest of the current picture cannot be parsed or decoded correctly

Also, this parsing error can affect subsequent inter images that may use temporal motion candidates

Therefore, a small decoding error of a motion vector can cause the parsing failure of many subsequent images

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