Enhanced Temporal Motion Derivation Beyond VVC

Temporal motion information has been widely exploited in advanced video coding standards to facilitate the efficiency of inter coding. In prior-arts, temporal cues are derived from fixed locations in a single collocated frame without considering trajectory consistency. This paper proposes to enhance temporal motion derivation in two aspects. On one hand, two collocated frames are utilized to provide more abundant temporal motion information from both forward and backward directions. On the other hand, motion shifts to locate regular temporal motion vector prediction (TMVP) or sub-block based TMVP (SbTMVP) are adaptively determined from multiple locations according to template matching costs. Simulation results indicate the proposed methods can achieve 0.11% and 0.15% coding gains respectively for RA and LDB configurations on ECM-7.0, with negligible complexity increase. The proposed method has been adopted into ECM-8.0.