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Obtaining 3D Models with a Hand-Held Camera

Reported by: Bianca Rey, Photos by Colleen Fiegel


Obtaining 3D Models using hand-held cameras is a new technique developed by Marc Pollefys a kindly Belgian. This highly technical course details exactly how the geometry of this procedure works as well as some of its applications. The technique is a new way to capture, recreate, and manipulate scenes in real space. As of now, obtaining a 3-D model requires calibrated cameras, lasers, and some highly complex computing technology. Some examples would be that of the "Bullet Time," the super slow motion used in the Matrix, which required dynamic camera movement around slow-motion events that approached 12,000 frames per second. This effect was achieved by placing equally spaced cameras guided by lasers. Another example would be the ping-pong ball technique used in video games, which is used to track the movement of the actors. These two techniques are costly in both time and money. This advancement in scene reconstruction will be very useful for the new wave of digital filmmakers. Some applications include recreating lost sets or manipulating someone's actions onscreen. In order to perform such a task, only a camera, footage, and basic knowledge of 3D computer graphics and geometry is necessary. The progression of this technique will also allow its automation. In other words, one could record the footage of a scene, and later go back and edit it.

 

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