Local Descriptors for Spatio-temporal Recognition
- Cite this paper as:
- Laptev I., Lindeberg T. (2006) Local Descriptors for Spatio-temporal Recognition. In: MacLean W.J. (eds) Spatial Coherence for Visual Motion Analysis. Lecture Notes in Computer Science, vol 3667. Springer, Berlin, Heidelberg
This paper presents and investigates a set of local space-time descriptors for representing and recognizing motion patterns in video. Following the idea of local features in the spatial domain, we use the notion of space-time interest points and represent video data in terms of local space-time events. To describe such events, we define several types of image descriptors over local spatio-temporal neighborhoods and evaluate these descriptors in the context of recognizing human activities. In particular, we compare motion representations in terms of spatio-temporal jets, position dependent histograms, position independent histograms, and principal component analysis computed for either spatio-temporal gradients or optic flow. An experimental evaluation on a video database with human actions shows that high classification performance can be achieved, and that there is a clear advantage of using local position dependent histograms, consistent with previously reported findings regarding spatial recognition.
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