Fast spectral reflectance recovery using DLP projector

  • Authors:

  • Shuai Han;Imari Sato;Takahiro Okabe;Yoichi Sato

  • Affiliations:

  • Institute of Industrial Science, The University of Tokyo, Japan;National Institute of Informatics, Japan;Institute of Industrial Science, The University of Tokyo, Japan;Institute of Industrial Science, The University of Tokyo, Japan

  • Venue:
  • ACCV'10 Proceedings of the 10th Asian conference on Computer vision - Volume Part I
  • Year:
  • 2010

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Abstract

Spectral reflectance is an intrinsic characteristic of objects which is useful for solving a variety of computer vision problems. In this work, we present a novel system for spectral reflectance recovery with a high temporal resolution by exploiting the unique color-forming mechanism of DLP projectors. DLP projectors use color wheels to produce desired light. Since the color wheels consist of several color segments and rotate fast, a DLP projector can be used as a light source with spectrally distinct illuminations. And, the appearance of a scene under the projector's irradiation can be captured by a high-speed camera. Our system is built on easily available devices and capable of taking spectral measurements at 100Hz. Based on the measurements, spectral reflectance of the scene is recovered using a linear model approximation. We carefully evaluate the accuracy of our system and demonstrate its effectiveness by spectral relighting of dynamic scenes.