Identification of anomaly behavior of ships based on KNN and LOF combination algorithm

On the issue of low precision of ship anomaly behavior detection method based on global variable and calculation complexity of ship anomaly detection based on local variable, a combination of K Nearest Neighbor (KNN) and Local Outlier Factor (LOF) algorithm for ship anomaly behavior detection is proposed in this paper. Firstly, ship anomaly data candidate set is filtered by K nearest neighbor, then calculating local deviation index by LOF algorithm, lastly setting threshold value to judge ship anomaly behavior, so as to achieve rapid, effective ship anomaly behavior detection. To a certain extent, it helps the maritime safety supervision department to identify the potential risks of their ship, and improve regulatory efficiency.