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Handbook of Multimedia for Digital Entertainment and Arts- P17

Handbook of Multimedia for Digital Entertainment and Arts- P17: The advances in computer entertainment, multi-player and online games, technology-enabled art, culture and performance have created a new form of entertainment and art, which attracts and absorbs their participants. The fantastic success of this new field has influenced the development of the new digital entertainment industry and related products and services, which has impacted every aspect of our lives. | 21 Projector-Camera Systems in Entertainment and Art 479 Physically Viewing Interaction By projecting images directly onto everyday surfaces a projector-camera system may be used for creating augmentation effects such as virtually painting the object surface with a new color new texture or even an animation. Users can interact directly with such projector-based augmentations. For example they may observe the object from different sides while simultaneously experiencing consistent occlusion effects and depth or they can move nearer or further from the object to see local details and global views. Thus the intuitiveness of physical interaction and advantages of digital presentation are combined. This kind of physically interactive visualization ability is suitable for use in situations when virtual content is mapped as a texture on real object surfaces. View-dependent visual effects such as highlighting to simulate virtually shiny surfaces require tracking of the users view. Multi-user views can also be supported by time-multiplexing the projection for multiple users with each user wearing a synchronized shutter glass allowing the selection of individual views. But this is only necessary for view-dependent augmentations. Furthermore view tracking and stereoscopic presentation ability enables virtual objects to be displayed not only on the real surface but also in front of or behind the surface. A general geometric framework to handle all these variants is described in 26 . The techniques described above only simulate the desired appearance of an augmented object which is supposed to remain fixed in space. To make the projected content truly user-interactive more information apart from viewpoint changes is required. After turning an ordinary surface into a display it is further desirable to extend it to become a user interface with an additional input channel. Thereby cameras can be used for sensing. In contrast to other input technologies such as embedded electronics