VideoTrace: Rapid interactive scene modelling from video
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Date posted: 29/09/2007
Posted by: Site Administration
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A new modelling system, VideoTrace; the result of a collaboration between The Australian Centre for Visual Technologies at the University of Adelaide, and The Oxford Brookes Computer Vision Group, is capable of taking the output of any handheld digital camcorder, and turn it into a 3D model.

The user takes a film of the object to be recreated from every possible angle ? just walking round it, camera in hand, pointing at the object as they move.

This film file is then uploaded into VideoTrace. They then trace tracing the shape of the object to be modelled over one or more frames of the video. The video can be played forwards or backwards, and the software is intelligent enough to work out which parts of the object to anchor to, and moves the sketched out areas with the car as position changes. This allows the sketch to become truly 3D as new parts are added from different angles.

By interpreting the sketch drawn by the user in light of 3D information obtained from computer vision techniques, the software can work out if a surface is horizontal or vertical, adjusting the plains of the sketch to suit, and working with the user, as more points and curves are added over time, to complete the 3D model.

VideoTrace provides an intuitive and powerful means of modelling shape from video, and executes quickly enough to be used interactively.

The combination of automated and manual reconstruction allows VideoTrace to model parts of the scene not visible, and to succeed in cases where purely automated approaches would fail.

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