Workflow application for detection of unwanted events

The paper presents a workflow application aimed at detection of unwanted and potentially dangerous events observed by multimedia cameras installed at public facilities, such as universities. The detection of unwanted events launches alarms, causes notifications to be sent to respective forces and videos to be recorded. The proposed application model consists of several stages: nodes with camera(s) attached to them, node(s) for fetching data streams, node(s) for data processing and nodes used for notification and data storage. The already implemented testbed application fetches either a stream of data from a camera attached to a computer or reads a video file. The stream is decoded and data are processed by parallel processes on a cluster. The implemented testbed application detects a movement in the stream and can be applied for monitoring the university during the night.