MuchattentionhasrecentlybeenpaidtoAugmented Reality (AR) systems, which can enhance a human's dailylife by blending multi-modalinformation with the real world. Most existing AR systems provide such information for humans by using monitor displays or see-through HMDs (head mounted displays) as interface devices. In applying AR to human-robot interfaces in teaching tasks, however, alternative systems should be developed to overcome the limitations of the existinginterfaces and to allow for more
exible interaction. The paper presents an attempt to make such interface using an extended digital desk for guiding and teaching robot tasks. A prototype system consists of a projector subsystem for information display and a realtime tracking vision subsystem for recognizing human's action. Two levels of interaction have been developed: (1) VOP, virtual operational panel for primitive robot operations and (2) IIP, interactive image panel for intuitive teaching using projected live image...