Fast MPEG-4 Motion Estimation: Processor Based and Flexible VLSI Implementations
Journal of VLSI Signal Processing Systems - Special issue on implementation of MPEG-4 multimedia codecs
An improved R-D optimized motion estimation method for video coding
PCS'09 Proceedings of the 27th conference on Picture Coding Symposium
Optimizing motion compensated prediction for error resilient video coding
IEEE Transactions on Image Processing
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We present an efficient motion estimation algorithm where motion vectors are selected based on a rate-distortion criterion. The algorithm minimizes the rate subject to a constraint on overall distortion by optimizing jointly the motion vector coder and the residual coder. As the joint optimization is generally very demanding, we propose methods where the rate-distortion performance of the residual coder is approximated by parametric functions. This results in a substantial reduction in computational complexity while sacrificing only a small loss in performance. Experimental results indicate that the proposed algorithm can improve the performance of H.261- and H.263-based video coders significantly while still generating H.261/H.263 decodable bit streams, respectively.