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The Steerable Projector and Camera Unit in an Instrumented Environment

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Title: The Steerable Projector and Camera Unit in an Instrumented Environment


1
The Steerable Projector and Camera Unit in an
Instrumented Environment
Lübomira Spassova Saarland University,
Saarbrücken, Germany
2
Agenda
  • Overview about instrumented environments
  • Description of the hardware
  • Image correction
  • Current applications
  • Open research questions

3
Saarland University Pervasive Instrumented
Environment (SUPIE)
4
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

5
General Ideas
  • Different aspects of everywhere projection
  • Display continuum e.g. user interface can be
    adapted to the users position
  • Virtual layer covering the instrumented room
    e.g. virtual objects placed on physical surfaces
    / objects (images, text, highlighting, )

6
Problem
  • How to correct the distortion of the image caused
    by oblique projection?

7
Solution
  • Exploit the fact that cameras and projectors are
    geometrically equal

8
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)
9
Possible Applications
  • Augmenting physical objects
  • Annotating
  • Highlighting
  • Placing virtual objects
  • Camera-based interaction
  • Combination with spatial audio
  • Moving virtual character

10
Example Search Light
  • Scan the room for optical markers (AR Toolkit)
  • Project a spot around the searched object

11
Example Wipe Gesture Control
  • Simple wipe gesture recognition by analyzing
    video stream
  • Objects (images) can be moved from one screen to
    another

12
Example Virtual Room Inhabitant
  • Movable video and audio

13
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

14
Discussion
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