A system or method suitable for determining whether a person in the vicinity of a railway track is authorised or unauthorised, the system or method comprising receiving an image in the vicinity of a railway track, identifying a person in the image and identifying whether the person is wearing authorised clothing. An optical detector may capture colour and/or infra-red images. Identifying a person in the image may comprise a processor configured to calculate feature descriptors of the image including histogram of orientated gradients descriptors 22 and configured to apply a cascade classifier 26 method to the feature descriptors. The system/method may comprise determining overlapping detected persons and discarding the smaller by non-maxima suppression 28. The system/method may include a colour/light filter 30/32 to identify whether the person is wearing a garment of a predetermined colour/light level wherein the image may be a colour/greyscale image respectively. An alert may be output if an unauthorised person is detected and a timestamp and/or geographical position may be associated with the image.
System and method for detecting unauthorised personnel
2017-06-21
Patent
Elektronische Ressource
Englisch
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