The recognition of motions is very important for understanding dynamic actions and extracting events from video sequences. In this paper, we propose invariants on object motions, which can be extracted from image sequences, and are invariant even if the motions are viewed from arbitrary viewpoints. We call them space-time invariants since they are defined under space-time projections. We show that these invariants are very useful for extracting specific motions from video sequences. The proposed space-time invariants are implemented and tested on real image sequences.
Index Terms:
space-time invariants, motion recognition, video indexing
Citation:
Makoto Mizoguchi, Jun Sato, "Space-Time Invariants and Video Motion Extraction from Arbitrary Viewpoints," icpr, vol. 4, pp.40056, 16th International Conference on Pattern Recognition (ICPR'02) - Volume 4, 2002