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Published in:
2008 | OriginalPaper | Chapter
An Efficient Dense and Scale-Invariant Spatio-Temporal Interest Point Detector
Authors : Geert Willems, Tinne Tuytelaars, Luc Van Gool
Published in: Computer Vision – ECCV 2008
Publisher: Springer Berlin Heidelberg
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Over the years, several spatio-temporal interest point detectors have been proposed. While some detectors can only extract a sparse set of scale-invariant features, others allow for the detection of a larger amount of features at user-defined scales. This paper presents for the first time spatio-temporal interest points that are at the same time scale-invariant (both spatially and temporally) and densely cover the video content. Moreover, as opposed to earlier work, the features can be computed efficiently. Applying scale-space theory, we show that this can be achieved by using the determinant of the Hessian as the saliency measure. Computations are speeded-up further through the use of approximative box-filter operations on an integral video structure. A quantitative evaluation and experimental results on action recognition show the strengths of the proposed detector in terms of repeatability, accuracy and speed, in comparison with previously proposed detectors.