Dual-layer approach for improved mesh-based motion compensation

• Published in: IET image processing Vol. 1; no. 4; pp. 343 - 351
• Main Authors: Yu, A.C., Park, H., Martin, G.R.
• Format: Journal Article
• Language: English
• Published: Stevenage Institution of Engineering and Technology 01.12.2007; The Institution of Engineering & Technology
• Subjects: Algorithms; Applied sciences; Blocking; Coding, codes; Computer simulation; Encoders; Exact sciences and technology; Finite element method; Image processing; Information, signal and communications theory; Miscellaneous; Motion compensation; Motion simulation; Signal and communications theory; Signal processing; Telecommunications and information theory; Performance evaluation; Motion estimation; Image processing; Rate distortion theory; Information rate; Algorithm; Information transmission; Codec; Simulation; Coding; Signal processing; Motion compensation; Signal to noise ratio
• ISSN: 1751-9659; 1751-9667
• DOI: 10.1049/iet-ipr:20060322

A dual-layer algorithm for mesh-based motion compensation is described. The technique utilises meshes at different scales and aims to improve the rate-distortion performance at fixed bit rates. The proposed algorithm identifies motion-active regions in the picture without the need for time-consuming evaluation. By enhancing the mesh structure in the motion-active regions, a significant improvement in motion estimation is obtained. Furthermore, a scheme to construct two different significance maps, at both encoder and decoder, provides a reduction in transmission overhead. A block-wise motion information coding approach is proposed, permitting a group of static grid points to be represented by a one-bit codeword. Simulations are reported for a wide range of test sequences possessing different degrees of motion activity. The results demonstrate that the proposed algorithm achieves a better PSNR-rate performance compared with conventional mesh-based motion compensation methods.