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Low-complexity global motion estimation from p-frame motion vectors for MPEG-7 applications

: Smolic, A.; Hoeynck, M.; Ohm, J.-R.


IEEE Signal Processing Society:
International Conference on Image Processing 2000. Proceedings. Vol. 2 : 10 Sep 2000 - 13 Sep 2000, Vancouver
Piscataway: IEEE, 2000
ISBN: 0-7803-6297-7
International Conference on Image Processing (ICIP) <2000, Vancouver>
Fraunhofer HHI ()

In this contribution, we present an algorithm for low-complexity global motion estimation, that works with block-coded video (e.g. MPEG-2). A superimposed global motion model is fitted to decoded P-frame motion vector fields, providing real-time performance. Therefore a robust M-estimator is applied since a lot of outliers have to be expected in the motion vector fields. The algorithm is compared to a state-of-the-art global motion estimator. The main characteristics of the global motion are captured accurately in most cases, although estimation may fail. We also report the integration of the estimator into a complete MPEG-7 system for search-and-retrieval of video based on motion characteristics.