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An optical camera was recently employed by a subset of the authors as a sensing modality complementary to that of a Pyroelectric InfraRed (PIR) sensor, for carrying out intrusion detection and classification in an outdoor environment. The aim there was to develop a classification algorithm that mimicked the performance of the PIR sensor and which was complementary to the PIR in the sense that it could carry out detection in environments where the PIR was unable to function effectively. An example of such a setting is when the ambient temperature is close to that of the human body. The algorithm for intrusion detection using the optical camera presented there, achieved an accuracy in excess of 95% and was implemented on an Odroid C2 (OC2) single-board computer (SBC). However, at 3.6W, the OC2 is relatively power hungry and this prompted the current effort to develop a version of the optical camera system …