ABNORMAL BEHAVIOUR DETECTION

摘要

Methods and apparatus for determining whether a provided object track (24) is abnormal, an object track (24) being a set of values of a physical property of an object (2) measured over a period of time, the method comprising: providing a model comprising one or more functions (26), each function (26) being representative of an object track (24) that is defined to be normal; assigning the provided object track (24) to a function (26); and comparing the provided object track (24) to the assigned function (26) to determine whether that object track (24) is abnormal. Providing the model comprises: for each of a plurality of objects (2), determining an object track (24), wherein the determined object tracks (24) are defined as normal object tracks (24); and using the determined tracks (24), performing a Gaussian Processes based Variational Bayes Expectation Maximisation process to learn the one or more functions (26).

主权项

1. A method of determining whether a provided object track is an abnormal object track, an object track being a set of values of one or more physical properties of an object measured over a period of time, a physical property of an object being any property that is measurable whose value describes the object's state, the method comprising:
providing a model, the model comprising one or more functions, each function being representative of an object track that is defined to be normal; assigning the provided object track to a function; and comparing the provided object track to the function to which it has been assigned to determine whether or not that object track is an abnormal object track; wherein providing the model comprises:
for each of a plurality of objects, determining an object track, wherein the determined object tracks are defined as normal object tracks; andusing the determined object tracks, performing a Gaussian Processes based Variational Bayes Expectation Maximisation process to determine the one or more functions, each function being representative of one or more of the determined object tracks, the functions forming the model.