Abstract
We propose a novel, online adaptive one-class support vector machines algorithm for anomaly detection in crowd scenes. Integrating incremental and decremental one-class support vector machines with a sliding buffer offers an efficient and effective scheme, which not only updates the model in an online fashion with low computational cost, but also discards obsolete patterns. Our method provides a unified framework to detect both global and local anomalies. Extensive experiments have been carried out on two benchmark datasets and the comparison to the state-of-the-art methods validates the advantages of our approach.