Motion Compensation Using 2-D Deformable Mesh for Very Low Bit-Rate Video System

• Main Authors: Mao-Hsiung Hung, 洪茂雄
• Other Authors: Chaur-Heh Hsieh
• Format: Others
• Language: en_US
• Published: 1999
• Online Access: http://ndltd.ncl.edu.tw/handle/17423232003074628778

碩士 === 義守大學 === 資訊工程學系 === 87 === Motion Compensation is a key technique for video compression since it can effectively reduce temporal redundancy of a video signal. Block-based method is the popular technique and was adopted by the current video coding standards. Recently, mesh-based method has received great attention since it can handle complex motion types such as rotation and zooming, which can not be solved by block-based method. Thus it significantly reduces the blocking artifacts of the conventional block-based method. In this thesis, a new motion compensation method using 2-D deformable mesh is presented for coding a video signal in a very low bit-rate. The method contains two novel techniques including regular nonuniform mesh and weighted interpolation block matching. The former generates a simple and regular mesh to effectively characterize a moving picture. The latter estimates the displacements of grid points of a mesh by exploiting the motion correlation of neighboring patches. Experimental results show that the new method can obtain about 2dB improvement of PSNR over conventional block-based method. In addition, it improves the visual quality of prediction significantly.