System Definition

The End User consultations carried out in the early part of the project, provided input into the system design, resulting in the top level context diagram for the demonstration system as shown. The system was required to interface to an existing CCTV network comprising a number of imaging sensors [cameras] and a single system operator. For the demonstration system, the number of sensor interfaces was limited to a maximum of four, but this was not a fundamental limit as the system context was designed to be scalable to accept any number of sensor inputs. The purpose of the operator interface (MMI) was to allow an operator to view the raw and processed data from all cameras and control the operation of the data processing.

SUBITO System Context Diagram

The context diagram shown above highlights the Sensor Interface, Man-Machine Interface (MMI), Data Store, Other Sensors (if available) and System Processor components of the system. These components provide the following system capabilities.

• • The Sensor Interface would provide data acquisition support for each of the 4 camera interfaces to allow simultaneous data capture for processing by the system processor.
• • The System Processor would operate on the camera data and provide the 'unattended baggage detection' and fast 'owner identification' and 'tracking' functions of the system.
• • The MMI would interface the operator with the system processor and provide raw, processed and stored data visualisation and control facilities to enable the operator to control and demonstrate the systems capabilities.
• • The Data Store would provide 'bulk, long term memory' storage for the system to support recording and playback of raw and processed video data to support 'unattended baggage' event analysis technology demonstration.
• • If available the Other Sensors component would integrate any beneficial sensor technologies identified during the supporting studies work with the system processor for demonstration.

In addition the process of determining the system requirements, allowed certain Key Performance measures to be defined. Specifically it is necessary that for an effective fielded system to be adopted by end users, the performance should provide:

• • Almost 100% 'suspicious' Unattended Baggage (UB) and owner event detection, low false alarm rate.

To maximise system effectiveness there is also a set of desirable Key Performance measures, presenting a more challenging design task:

• • 100% 'suspicious' UB and owner event detection, with 0% false alarms.