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This paper proposes the step-on interface (SOI) to operate a mobile robot in which a projector projects and displays a direction screen on a floor and a user specifies a button showing the selected movement by stepping or pointing. The HFAMRO-1 mobile robot has been developed to demonstrate the SOI's potential (HFAMRO: "Human-friendly amusing" mobile robot). The SOI of HFAMRO-1 consists of a projector and a range scanner on an omni-directional mobile platform. From operational comparison with other input interfaces, it is confirmed that the authors can direct the robot movement using the own foot.
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