PaperUI is a human-computer interface concept that treats paper as displays that users can interact with via mobile devices such as mobile phones and projectors. It combines the merits of paper and the mobile devices. Compared with traditional laptops and tablet PCs, devices involved in this concept are more light-weight, compact, energy efficient, and widely adopted. Therefore, we believe this interface vision can make computation more convenient to access for general public. With our implemented prototype, pilot users can read documents easily and comfortably on paper, and access many digital functions related to the document via a camera phone or a mobile projector

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