The shadowy life of many webcams

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• Robert Pless, Washington University in St. Louis
• Wednesday 23 April 2014, 10:00-11:00
• Auditorium, Microsoft Research Ltd, 21 Station Road, Cambridge, CB1 2FB.

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This event may be recorded and made available internally or externally via http://research.microsoft.com. Microsoft will own the copyright of any recordings made. If you do not wish to have your image/voice recorded please consider this before attending

The web has an enormous collection of live cameras view image parks, roads, cities, beaches, mountains, ski-resorts, buildings and more. Over the last 7 years, I have been archiving imagery from most (>25000) publically available outdoor cameras, and working to understand how to effectively use this massively distributed resource as a tool for measurement of our changing world. I will talk about approaches to visualizing very long term time-lapse imagery, and talk specifically about recent work in understanding outdoor shadows and the geometric constraints that relate shadows to 3D shape.

In the context of working with half a billion images from uncontrolled webcams I will conclude with some problems that have turned out to be more challenging that we expected, and some opportunities in applications domains including environmental measurement (phenology measurement) and public health (measuring physical activity behaviours).

This talk is part of the Microsoft Research Cambridge, public talks series.

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