In this paper, we describe the design of menus for multiuser digital tabletops. On direct input surfaces, occlusions created by the user's hand decrease interaction performance with menus. The key design criteria are to avoid these occlusions and to adapt the menu placement to the user's handedness and position on the tabletop. We present an adaptive menu placement method based on direct touch and pen tracking that allows correct menu placement around the table. As an extension, we propose adding a gesture input area for fast interaction which can be partly occluded by the user's hand.

Abstract. Collaborative Augmented Reality (AR) setups are becoming increasingly popular. We have developed a collaborative tabletop environment that is designed for brainstorming and discussion meetings. Using a digital pen, participants can annotate not only virtual paper, but also real printouts. By integrating both forms of physical and digital paper, we combine virtual and real 2d drawings, and digital data which are overlaid into a single information space. In this paper, we describe why we have integrated these devices together in a unique way and how they can be used efficiently during a design process.

When multiple users are simultaneously sharing a workspace, it is not always clear what should happen when a user invokes an undo action. In this paper we explore different user interfaces for undo/redo for co-located collaborative workspaces, such as large interactive whiteboards. A preliminary study revealed that users expect neither a global nor personal undo, but rather a regional undo. We propose and evaluate three automatic regional undo/redo techniques (clustering, workspace, field of view) designed for a large interactive whiteboard. The results of the evaluation showed that an undo technique based on users' field of view was most preferred, while the content-based clustering technique produced most errors. We conclude with potential improvements to the developed techniques, and propose a set of design recommendations for implementing regional undo/redo on large interactive surfaces.

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In most work environments people archive both the real and digital versions of their documents. But unlike the digital world, in the physical world locating a document can become a very time consuming task. The reason for this is the lack of a direct connection between the physical and digital versions of documents.The Smart Filing System combines the benefits of the digital and the real world providing an augmented filing cabinet. The system benefits by linking the physical world with the digital desktop world. In our setup, we implemented an addin for MS OneNote TM . Furthermore, real folders and cabinets are extended with devices for direct input and output. This allows us to search and browse through digital documents using MS OneNote TM . Simultaneously, our system also allows a feedback in the physical world, by highlighting the corresponding folder in the filing cabinet. In this paper we describe the hardware and software implementation our prototype system, and present the results of a preliminary pilot study of its use.