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...le display). Nevertheless, a multi-layer application should always providesusers with the ability to rest from time to time, e.g., bysfreezing particular views and putting them down on thestable (cf. =-=[16]-=-).sBeyond that, in many scenarios the required number ofsphysical layers can easily extend a reasonable amount. Inssuch cases, better layer subdivision strategies must besfound, such as distorting the...

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... the notion of embodied lenses that begin to capture these aspects of embodied interaction [9] for interactive queries on digital tabletop displays [8, 16]. Our approach is similar to Spindler et al. =-=[49]-=- and Koike et al. [28] in that we bridge virtual objects on the tabletop display with lens manifestations in physical space. However, we continue the physical metaphor further by allowing users to ove...

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... or grasp based interfaces. Existing approaches deal with these issues by either moving the interactive surface in the 3D space to become aligned with the floating object, e. g., using tangible views =-=[20]-=- or transparent props [17], or calculating a 3D position of a distant ”cursor” as function of the positions of multiple touch points [2, 21]. The latter approach could be described figu(b) 21(a) Figu...

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...uch as paper, was also used to dynamically modify the projection surface in two ways: (1) to increase and decrease the display size and (2) for (semantic) zooming, comparable to tangible magic lenses =-=[21]-=-, but in a mobile situation. Participants used folding gestures with paper to increase or decrease the display size. Folding paper was mapped to decreasing and unfolding paper was mapped to increasing...

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...s by moving and rotating them through the physical space above or beside the table. With six degrees of freedom (6DOF), a rich set of interaction techniques becomes available, e.g., as categorized in =-=[30]-=-. One example for this is moving a display up and down for zooming. In order to make spatial interaction more explicit, we incorporated pressure-sensitive on-palette buttons, which further extends the...

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...bjects on a landscape by providing visual hints on the user device to guide direction, by using halos as offered by Baudisch et al. [1]. Horizontal and Vertical Panning In contrast to Spindler et al. =-=[11, 12]-=-, we propose an egocentric manipulation of the tangible magic lens’ viewport and thus set the user as a reference point to navigate within an information space. This viewport is visible on the mobile ...

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... is, when the devicesaugments an object directly below and in contact with itssdisplay. The resulting interactions resemble known conceptssshown with tool-glasses and magic lenses [4], tangible viewss=-=[16, 31]-=-, and aspects of mobile AR [3].sToolglass and magic lens widgets for WIMP interfaces sitsbetween the application and the cursor to provide richersoperations and visual filters on the digital content. ...

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...swould be to calculate an image for each slightly angled sidesof the book and combine it within a single image projectedsby the system. This is similar to the technology used in thesmagic lens system =-=[15]-=-, where different information issprojected onto multiple tilted lenses by a single projector.sSecond, the curvature of a page can be roughly estimatedsby continuous tracking the book’s shape using a c...

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...s motivated a number of approaches for concealing markers from the human eye. These can be divided roughly into four categories. Retroreflective materials have been reliably used with several systems =-=[11, 17, 22, 35]-=-, but are difficult to conceal entirely and can reflect visible light back to the user when used with handheld projection. Scaling the marker pattern down, so it is nearly imperceptible to the user, i...

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... videos. PaperLens [30] demonstrated how the space above the tabletop can be used for interactions with single paper-like displays. Our conceptual model (cf. section 4) was inspired by previous works =-=[6,31]-=- that have investigated gestures and an interaction vocabulary of paper-like displays. We improve upon these works by addressing paper-based interaction with both visual and audio contents, by introdu...