Advanced lifting-based motion-threading (MT) technique for 3D wavelet video coding
Lin Luo, Feng Wu, Shipeng Li, Zhenquan Zhuang · Proceedings of SPIE, the International Society for Optical Engineering/Proceedings of SPIE · 2003
This paper proposes an advanced motion-threading technique to improve the coding efficiency of the 3D wave-let coding. We extend the original motion-threading technique to the lifting wavelet structure. This extension solves the artificial motion thread truncation problem in long support temporal wavelet filtering, and enables the accuracy of motion alignment to be fractional-pixel with guaranteed perfect reconstruction. Furthermore, the mismatch problem in the motion-threading caused by occlusion or scene-change is considered. In general, the temporal wavelet decomposition consists of multiple layers. Unlike the original motion-threading scheme, in the proposed scheme each layer owns one set of motion vectors so as to achieve both high coding efficiency and temporal scalability. To reduce the motion cost, direct mode is used to exploit the motion vector correlation. An R-D optimized technique is introduced to estimate motion vectors and select proper prediction modes for each macroblock. The proposed advanced motion-threading scheme can outperform the original motion-threading scheme up to 1.5~5.0 dB. The experimental results also demonstrate that the 3D wavelet coding scheme can be competitive with the start-of-the-art JVT video standard on coding efficiency.