Temporal Dithering of Illumination for Fast Active Vision

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 (106 /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. We apply our approach to five well-known problems: (a) structured light-based range finding, (b) photometric stereo, (c) illumination de-multiplexing, ...

• Type: Conference
• Year: 2008
• Where: ECCV
• Authors: Srinivasa G. Narasimhan, Sanjeev J. Koppal, Shuntaro Yamazaki
• Keywords: Active Vision, Active Vision Technique, Active Vision Techniques, Computer Vision, ECCV 2008, Fast Active Vision, Off-the-shelf Dlp Projector