One-shot multispectral color imaging with a stereo camera

Abstract

Multispectral color imaging is a promising technology, which can solve many of the problems of traditional RGB color imaging. However, it still lacks widespread and general use because of its limitations. State of the art multispectral imaging systems need multiple shots making it not only slower but also incapable of capturing scenes in motion. Moreover, the systems are mostly costly and complex to operate. The purpose of the work described in this paper is to propose a one-shot six-channel multispectral color image acquisition system using a stereo camera or a pair of cameras in a stereoscopic configuration, and a pair of optical filters. The best pair of filters is selected from among readily available filters such that they modify the sensitivities of the two cameras in such a way that they get spread reasonably well throughout the visible spectrum and gives optimal reconstruction of spectral reflectance and/or color. As the cameras are in a stereoscopic configuration, the system is capable of acquiring 3D images as well, and stereo matching algorithms provide a solution to the image alignment problem. Thus the system can be used as a "two-in-one" multispectral-stereo system. However, this paper mainly focuses on the multispectral part. Both simulations and experiments have shown that the proposed system performs well spectrally and colorimetrically.

Multi-spectral Material Classification in Landscape Scenes Using Commodity Hardware

“…Finally, spectral reconstruction can be achieved with a stereo consumer compact camera as shown by Shrestha et al [10]. They present a stereo, multispectral configuration focusing on spectral reconstruction rather than the stereo implications of the system.…”

“…Previously spectral reconstruction has been achieved with a stereo consumer compact camera [10]. Such a system is faster, more practical, and cheaper than a true multi-spectral imaging system and results in six-band, stereo image data.…”

Multispectral and colour imaging systems for the detection of small vertebrate fossils: A preliminary study

“…This last approach is achieved through colour filter wheels (Vilaseca et al, 2006) and tunable filters of liquid crystal or acousto-optic technology (Hardeberg et al, 2002;Tran, 2005). Multispectral imaging is a recent field of research with many applications such as remote sensing (Weng, 2011), colour imaging (Shrestha et al, 2011), biometrics and medicine (Vilaseca et al, 2008;Paquit et al, 2009;Bouchard et al, 2009;Basiri et al, 2010;Everdell et al, 2010), cultural heritage, and art work studies (Kubik, 2007;Padoan et al, 2008;Marengo et al, 2011;HerreraRamírez et al, 2014). However, its use in palaeontology has been anecdotal, with only one brief reference on its application on fake-fossil detection (Kaye et al, 2010).…”

Stereo one-shot six-band camera system for accurate color reproduction

“…[9][10][11] Like our system, their systems consist of a stereo camera and one or two sheets of color filter. However, their systems do not address several important issues.…”