This work describes a two stages algorithm for camera motion analysis. First, it detects frames defining changes in the camera motion pattern, and then characterises the motion pattern for each video segment. The proposed scheme is motivated by hierarchical content-aware adaptation of on-line video. Its main characteristics are on-line operation, direct analysis on the compressed domain, efficiency and robustness. Results are similar to those achieved by state-of-the-art camera motion classification schemes based on iterative fitting to a motion model, despite involving a significantly smaller number of operations.*
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