Motion Estimation Algorithms Using the Deformation of Planar Hierarchical Mesh Grid for Videoconferencing Applications at Low Bit-rate Transmission |
| |
Authors: | Anissa Mokraoui Vianney Mu?oz-Jiménèz Jean-Pierre Astruc |
| |
Affiliation: | (1) L2TI, Institut Galil?e, Universit? Paris 13, 99 Avenue Jean-Baptiste Cl?ment, 93430 Villetaneuse, France |
| |
Abstract: | This paper studies the issue of reducing the temporal redundancy between consecutive frames of a videoconferencing sequence
at low bit-rate transmission. To overcome the drawbacks of the traditional block matching algorithm implemented in the most
current video coding standards, we propose to better describe the motion of objects through the deformation of planar rectangular
mesh grid adapted to the edges of the moving objects in the scene. The traditional inter coding modes are then replaced by
two new classes of encoding algorithms. The first one concerns the B-frames where the problem of motion estimation is solved by a bidirectional prediction algorithm which reconstructs the quadrilateral
mesh grids without any coding cost. The second class of algorithm much more complex than the first one is specific to the
P-frames based on the principle of merging two hierarchical grids of reference. This algorithm addresses not only the motion
estimation problem based on the adaptive quadrilateral mesh grid but also the issue of the relevant information (e.g. the
positions of the nodes, the connectivity of each quadrilateral mesh of the grid and the motion compensation) to efficiently
encode. The implementation of these algorithms in a complete coding scheme offers good performance compared to the H.264/AVC
video coder at low bit-rate transmission. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|