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The Steerable Projector and Camera Unit in an Instrumented Environment Lübomira Spassova Saarland University, Saarbrücken, Germany
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Agenda Overview about instrumented environments Description of the hardware Image correction Current applications Open research questions
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Saarland University Pervasive Instrumented Environment (SUPIE)
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Hardware Projector (3.000 ANSI lumen, XGA resolution) Digital camera (4 mega pixels) –High quality pictures –Live video stream Moving yoke –Used for spotlights on stages –Steerable via DMX –Pan / tilt range: 340° / 270°
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General Ideas Different aspects of everywhere projection: Display continuum: e.g. user interface can be adapted to the user’s position Virtual layer covering the instrumented room: e.g. virtual objects placed on physical surfaces / objects (images, text, highlighting, …)
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Problem How to correct the distortion of the image caused by oblique projection?
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Solution Exploit the fact that cameras and projectors are geometrically equal
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Implementation Create a virtual model of the room with Java3D Calibrate optical parameters and position of virtual camera and projector Project an image taken by a virtual camera synchronized with the projector Steerable projector beam makes virtual objects visible (virtual torch light)
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Possible Applications Augmenting physical objects: –Annotating –Highlighting Placing virtual objects Camera-based interaction Combination with spatial audio Moving virtual character
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Example: Search Light Scan the room for optical markers (AR Toolkit) Project a spot around the searched object
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Example: Wipe Gesture Control Simple wipe gesture recognition by analyzing video stream Objects (images) can be moved from one screen to another
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Example: Virtual Room Inhabitant Movable video and audio
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Open Questions 3D scene acquisition / self-calibration Integration of a more elaborated gesture recognition Integration of speech / multimodal interaction Interaction between physical and virtual displays Combination of several steerable projectors
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Discussion
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