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Event processing systems serve as a middleware between the Internet of Things (IoT) and the application layer by allowing users to subscribe to events of interest. Due to the increase of multimedia IoT devices (i.e. traffic camera), the types of events created are shifting more toward unstructured (multimedia) data. Therefore, there is a growing demand for efficient utilization of effective processing of streams of both structured events (i.e. sensors) and unstructured multimedia events (i.e. images, video, and audio). However, current event processing engines have limited or no support for unstructured event types. In this paper, we described a generalized approach that can handle Internet of Multimedia Things (IoMT) events as a native event type in event processing engines with high efficiency. The proposed system extends event processing languages with the introduction of operators for multimedia analysis of unstructured events and leverages a deep convolutional neural network based event matcher for processing image events to extract features. Furthermore, we show that neural network based object detection models can be further optimized by leveraging subscription constraints to reduce time complexity while maintaining competitive accuracy. Our initial results demonstrate the feasibility of a generalized approach toward IoMT-based event processing. Application areas for generalized event processing include traffic management, security, parking, and supervision activities to enhance the quality of life within smart cities.

Towards a Generalized Approach for Deep Neural Network Based Event Processing for the Internet of Multimedia Things