Pad: an alternative approach to the computer interface
SIGGRAPH '93 Proceedings of the 20th annual conference on Computer graphics and interactive techniques
Tangible bits: towards seamless interfaces between people, bits and atoms
Proceedings of the ACM SIGCHI Conference on Human factors in computing systems
Speed-dependent automatic zooming for browsing large documents
UIST '00 Proceedings of the 13th annual ACM symposium on User interface software and technology
Fusion of Vision and Gyro Tracking for Robust Augmented Reality Registration
VR '01 Proceedings of the Virtual Reality 2001 Conference (VR'01)
Zooming interfaces for augmented reality browsers
Proceedings of the 12th international conference on Human computer interaction with mobile devices and services
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Tangible Augmented Reality (AR) interfaces use physical objects as a medium for interacting with virtual objects. In many cases, they track physical objects using computer vision techniques to attach corresponding virtual objects on them. However, when a user tries to have a closer look at the virtual content, the tracking can fail as the viewpoint gets too close to the physical object. To prevent this, we propose an automatic zooming method that helps users to achieve a closer view to the scene without losing tracking. By updating the zoom factor based on the distance between the viewpoint and the target object, a natural and intuitive zooming interaction is achieved. In a user study evaluating the technique, we found that the proposed method is not only effective but also easy and natural to use.