Temporal Dithering of Illumination for Fast Shape Acquisition - ECCV08 & CVPR09

Active vision techniques use programmable light sources, such as
projectors, whose intensities can be controlled over space and
time. We present a broad framework for fast active vision using
Digital Light Processing (DLP) projectors. The digital micromirror
array (DMD) in a DLP projector is capable of switching mirrors ``on''
and ``off'' at high speeds (10^6/s). An off-the-shelf DLP projector,
however, effectively operates at much lower rates (30-60Hz) by
emitting smaller intensities that are integrated over time by a sensor
(eye or camera) to produce the desired brightness value. Our key idea
is to exploit this ``temporal dithering'' of illumination, as observed
by a high-speed camera. The dithering encodes each brightness value
uniquely and may be used in conjunction with virtually any active
vision technique. In this video,
we demonstrate fast range finding using structured light projection.

Category:

Science & Technology

Tags:

• ECCV08
• CVPR09

[dvninh]

Very curious system.

I'm wondering how long does it take to reconstruct the 3D structure of an object? Can this system render the depth-map in real-time?

[shuntaraw]

Thanks. Our high-speed camera cannot send the captured frames to external systems (eg. PC) in real-time. Reconstructing a single depth-map from 25 captured frames takes 5-10 sec.

[dvninh]

Thank you for your answer, I'll look for your paper ^^