Using raw MPEG motion vectors to determine global camera motion

Maurizio Pilu

doi:10.1117/12.298354

9 January 1998 Using raw MPEG motion vectors to determine global camera motion

Maurizio Pilu

Proceedings Volume 3309, Visual Communications and Image Processing '98; (1998) https://doi.org/10.1117/12.298354
Event: Photonics West '98 Electronic Imaging, 1998, San Jose, CA, United States

Abstract

This paper presents a simple and effective method to determine global camera motion using raw MPEG-1 motion vectors information obtained straight form real MPEG-1 streams such as those of the new HITACHI MP-EG1A digital camcorder. The simple approach we have experimented with robustly fits a global affine optic flow model to the motion vectors. Other more robust methods are also proposed. In order to cope with the group-of-frames (GOF) discontinuity of the MPEG stream, B frames are used backward to determine the 'missing link' to a previous GOF thereby ensuring continuity of the motion estimation across a reasonable number of frames. As a tested, we have applied the method to the image mosaicing problem, for which interesting results have been obtained. Although several other methods exists to perform camera motion estimation, the approach presented here is particularly interesting because exploits 'free' information present in MPEG streams and bypass the highly expensive correlation process.

Citation Download Citation

Maurizio Pilu "Using raw MPEG motion vectors to determine global camera motion", Proc. SPIE 3309, Visual Communications and Image Processing '98, (9 January 1998); https://doi.org/10.1117/12.298354

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