An ARTag is a fiduciary marker system to support augmented reality. They can be used to facilitate the appearance of virtual objects, games, and animations within the real world. Like the earlier ARToolKit system, they allow for video tracking capabilities that calculate a camera's position and orientation relative to physical markers in real time. Once the camera's position is known, a virtual camera can be positioned at the same point, revealing the virtual object at the location of the ARTag. It thus addresses two of the key problems in Augmented Reality: viewpoint tracking and virtual object interaction.
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