In this study, we proposed wearable type "music interface" using surface electromyogram signals(EMG) in ubiquitous computing society. We have proposed the recognition technique of the hand finger motion based on EMG patterns. Using this system, it is possible to play the music to control finger motion and EMG. This system is not necessary to wear the device on the hands. We play the music without regard to the place and the scene.

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Illusion have been used in many works of art and entertainment products. To understand illusion better, we propose a support tool for Trick-Art production. Especially, we focused on the illusory motion in a still image. To clarify the condition that causes the illusion, we investigate and analyze the mechanism of the illusion effect. Our work is based on the optimized Fraser-Wilcox illusion. We observe the illusion effect using illusion unit pattern and changing the attribute of the pattern, for example, placement, shape and size. As the result, we obtained the knowledge about the condition which causes the illusion strongly. Using this knowledge, we developed a support tool for illusion production. Our tool makes it possible to create illusion products using the image specified by users as the illusion unit pattern.

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Our world has rapidly been expanding through the current pervasion of information in media. It purports that human actions have been generalised by digital technology. In this short thesis, the theory of "Digital Communication", which focuses on the relationship between digital technology and humans, describes some important aspects of our lives.

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