Security breaches are a major concern by both governmental and corporative organisations. This is the case, among others, of airports and official buildings, where X-ray security scanners are deployed to detect elements representing a threat to the human life. In this paper we propose a formal distributed schema, formally specified and analysed, to detect suspicious artefacts. Our approach consists in the integration of several image detection algorithms in order to detect a wide spectrum of weapons, such as guns, knifes and bombs. Also, we present a case of study, where some performance experiments are carried out for analysing the scalability of this schema when it is deployed in current systems.
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