Geometry-based Partitioning for Predictive Video Coding with Transform Adaptation

Abstract

Rectangular block partitioning as it is used in state of the art video codecs such as HEVC can produce visually displeasing artifacts at low bitrates. This effect is particularly noticeable at moving object boundaries. This contribution presents a comprehensive geometry-based block partitioning framework in a post-HEVC codec for motion compensated prediction, intra-prediction and transform coding as a solution. The method is evaluated on the set of sequences defined by the Joint Call for Proposals on Video Compression with Capabilities beyond HEVC [1]. Our contribution aims at visually improving the quality of object boundaries and provides an objective BD-rate gain of 0.82% on average compared to the reference Joint Video Exploration Team (JVET) test model (JEM 7.0).