Description
The Imaging Systems Group at Roke Manor Research has over 25 years experience of applying Image Processing and Computer Vision techniques in real-world commercial situations. Two of our major current activities are:

Hawk-Eye Tennis
This system demonstrates knowledge representation, reasoning and recognition & categorisation. Hawk-Eye tennis is a tennis ball tracking system, developed to provide statistical analysis for television commentators. Imposed requirements included:

• To provide an answer within 5 seconds of rally finish
• To use existing television cameras (which panned and zoomed out of our control)
• To provide millimetre accuracy in bounce position estimates.

Video Motion Anomaly Detector (VMAD)
This system exhibits behaviour of knowledge representation, learning and reasoning. VMAD (Video Motion Anomaly Detector) finds anomalous motion in a generic video stream. Monitoring the visible motion over a period of time, the system builds up a movement probability density function for each pixel in its view. For example, a view of a road would have strong unimodal probability distributions along the direction of traffic. The system compares observed behaviour with its model, and flags up behaviour it deems as divergent from its model. This could be stopped traffic on a motorway or suspicious behaviour of an individual in a security camera.

Further Information
www.roke.co.uk

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