Action Recognition Using Mined Hierarchical Compound Features

—The field of Action Recognition has seen a large increase in activity in recent years. Much of the progress has been through incorporating ideas from single frame object recognition and adapting them for temporal based action recognition. Inspired by the success of interest points in the 2D spatial domain, their 3D (space-time) counterparts typically form the basic components used to describe actions, and in action recognition, the features used are often engineered to fire sparsely. This is to ensure the problem is tractable; however, this can sacrifice recognition accuracy as it cannot be assumed that the optimum features in terms of class discrimination are obtained from this approach. In contrast, we propose to initially use an over complete set of simple 2D corners in both space and time. These are grouped spatially and temporally using a hierarchical process, with an increasing search area. At each stage of the hierarchy, the most distinctive and descriptive features are le...

• Type: Journal
• Year: 2011
• Where: PAMI
• Authors: Andrew Gilbert, John Illingworth, Richard Bowden
• Keywords: Action Recognition, Operations Research, PAMI 2011, Simple 2D Corners, Temporal Based Action