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A Steerable Projector and Camera Unit

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					The Steerable Projector and Camera Unit in an
Instrumented Environment
Lübomira Spassova
Saarland University, Saarbrücken, Germany
Agenda

•   Overview about instrumented environments
•   Description of the hardware
•   Image correction
•   Current applications
•   Open research questions
Saarland University Pervasive
Instrumented Environment (SUPIE)
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°
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, …)
Problem

• How to correct the distortion of the image caused
  by oblique projection?
Solution

• Exploit the fact that cameras and projectors are
  geometrically equal
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)
Possible Applications

• Augmenting physical
  objects:
  – Annotating
  – Highlighting
• Placing virtual objects
• Camera-based interaction
• Combination with spatial
  audio
• Moving virtual character
Example: Search Light

• Scan the room for optical markers (AR
  Toolkit)
• Project a spot around the searched object
Example: Wipe Gesture Control

• Simple wipe gesture
  recognition by analyzing video
  stream
• Objects (images) can be
  moved from one screen to
  another
Example: Virtual Room Inhabitant

• Movable video and audio
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
Discussion

				
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posted:6/28/2012
language:English
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