A Prism-based System for Multispectral Video Acquisition

Hao Du, Xin Tong, Xun Cao, and Stephen Lin

International Conference on Computer Vision (ICCV'2009)

The Goal

To design a multispectral video camera, capable of capturing videos of high spectral resolution.

Abstact

In this paper, we propose a prism-based system for capturing multispectral videos. The system consists of a triangular prism, a monochrome camera, and an occlusion mask. Incoming light beams from the scene are sampled by the occlusion mask, dispersed into their constituent spectra by the triangular prism, and then captured by the monochrome camera.

Our system is capable of capturing videos of high spectral resolution. It also allows for different tradeoffs between spectral and spatial resolution by adjusting the focal length of the camera. We demonstrate the effectiveness of our system with several applications, including human skin detection, physical material recognition, and RGB video generation.

Motivation

(a) A prism disperses an incoming light ray into its spectrum. The dispersed spectra of neighbering rays overlap one another and become difficult to separate.

(b) With an occlusion mask, the spectra of the rays that pass through the mask holes are separated and distinguishable in the recorded frames.

(a)

(b)

 

Principle Optical Path

Applications

* Genuine skin detection

* Water color .VS. poster color

Paper & Citation

Hao Du, Xin Tong, Xun Cao and Stephen Lin. A Prism-based System for Multispectral Video Acquisition. In Proceedings of IEEE International Conference on Computer Vision (ICCV), 2009 [PDF] [Slides]

@inproceedings{Du2009,
Author = {Du, H. and Tong, X. and Cao, X and Lin, S.},
Title = {A Prism-based System for Multispectral Video Acquisition},
BookTitle = {Proceedings of IEEE International Conference on Computer Vision (ICCV)},
Year = {2009} }

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