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Tabletop systems are currently being focused on and many applications using these systems are being developed. In such tabletop systems, how to recognize real objects on the table is an essential and important issue. In existing tabletop systems, 2-D markers have been often used. However, their black-and-white pattern, which means nothing to humans, spoils(More)
We introduce an inexpensive position input device called the <italic>FieldMouse</italic>, with which a computer can tell the position of the device on paper or any flat surface without using special input tablets or position detection devices. A FieldMouse is a combination of an ID recognizer like a barcode reader and a mouse which detects relative movement(More)
PhotoelasticTouch is a novel tabletop system designed to intuitively facilitate touch-based interaction via real objects made from transparent elastic material. The system utilizes vision-based recognition techniques and the photoelastic properties of the transparent rubber to recognize deformed regions of the elastic material. Our system works with elastic(More)
We present our new interaction technique for tabletop system and video game application using it. This technique is for recognizing a pinching gesture performed with the thumb and forefinger and tapping gestures with them by a ceiling camera above the table. The positions and orientations of multiple gestures are recognized at 200Hz, and the users around(More)
EffecTV is a real-time software video effect processor based on motion detection and image processing techniques. EffecTV was released in 2001 as an open source software, and has been growing the number of features and effects through contributions from the open source community. EffecTV has been used for various purpose-desktop toy applications, by visual(More)
We present a system for manipulating drawings that lets novice users create simple, yet expressive, animations. Users move and bend the drawings by touching them with their fingers. This natural and easy to learn interface evokes the unique experience of interacting with a digital object as though it were real.