| Video streaming codecs are key components in the field of multimedia over IP networks. Streaming over very low bitrate networks is still challenging. Commonly, video codecs are combined with intraframe compression, interframe compression and streaming protocols, etc. The research presented in this thesis is concerned with 2D mesh-based motion estimation & compensation techniques in very low bitrate transmissions using contents-adapted information that can be extracted from video sequences. In adaptive streaming protocol design, various network conditions are considered and corresponding strategies are applied in order to achieve efficient, high quality & robust client-side video playback. A quadtree algorithm is adopted throughout the codec design. This thesis also proposes efficient algorithms, for packaging the mesh data in the quadtree and re-establishing the quadtree with matching data. Finally, promising results of codec experiments are presented. |
