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In this paper we present two systems for augmenting indoor spaces with digital content using interactive environment away our handheld projectors our prototypes would explore several aspects of the design space are at varying degrees aware of their position and orientation in space and the surrounding environment the first system is a tethered handheld unit which contains a PICO projector a coaxial IR camera with diffuse illumination and an IMU the IMU provides orientation information whilst the IR camera can detect objects in front of the device such as the user's hands and fingers this enables shadow based interactions where a real shadow cast on the image can be used to control the displayed content here this ability is demonstrated using a physics based simulation it is also possible to use shadows to instantiate a menu with different icons when an item is selected with a finger gesture this is indicated by displaying the relevant icon in the palm of the hand another shadow based interaction technique uses pinch gestures to pan a digital document a second gesture may be used to activate a fingertip annotation tool our room projector combines the handheld unit shown previously with a lightweight infrastructure based on four ceilings mounted connect depth cameras when their user interacts in the space the absolute position of the projector is tracked using the Kine ct cameras these devices also generate real-time depth data which is fused to generate a mesh representation of the scene the raw depth data is noisy this becomes very apparent when the data from each camera is merged this is overcome by segmenting out a smooth background mesh tracking only foreground objects in real-time since the position and orientation of the handheld projector are tracked the area which the projection shines onto is accurately modeled it is possible to place virtual images within the modeled environment and reveal them in the real room as shown inset in the video by shining the mobile projector on them in the manner of a virtual flashlight we can detect shadow gestures using the built-in IR camera here we show a virtual painting technique where the fingertip is used to project graphics onto the surface behind unlike before this dynamic content may be fixed to any surface in the scene it is also possible to track the users hands using the data generated from the depth cameras in this example when the IR camera detects a pinch gesture the user can paint directly into 3d space visual feedback is generated in real-time using the projector shown in set a particle based physics simulation enables realistic interactions between the user and the virtual objects' feedback is provided to the user by using the projector as a flashlight into the virtual world shadow gestures can be used to extend these physics based interactions in this example virtual rods were extended through the shadow to enable physics based manipulation of virtual 3d content even when it is out of...
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