Agile Spectrum Imaging: Programmable Wavelength Modulation for Cameras and Projectors

Authors: Mohan, Ankit¹; Raskar, Ramesh²; Tumblin, Jack¹

Source: Computer Graphics Forum, Volume 27, Number 2, April 2008 , pp. 709-717(9)

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Abstract:

We advocate the use of quickly-adjustable, computer-controlled color spectra in photography, lighting and displays. We present an optical relay system that allows mechanical or electronic color spectrum control and use it to modify a conventional camera and projector. We use a diffraction grating to disperse the rays into different colors, and introduce a mask (or LCD/DMD) in the optical path to modulate the spectrum. We analyze the trade-offs and limitations of this design, and demonstrate its use in a camera, projector and light source. We propose applications such as adaptive color primaries, metamer detection, scene contrast enhancement, photographing fluorescent objects, and high dynamic range photography using spectrum modulation.

Keywords: I.3.1 [Computer Graphics]; Hardware Architecture I.4.1 [Image Processing and; Digitization and Image Capture

Document Type: Research article

DOI: http://dx.doi.org/10.1111/j.1467-8659.2008.01169.x

Affiliations: 1: Northwestern University, Evanston, IL 2: Mitsubishi Electric Research Laboratories, Cambridge, MA

Publication date: 2008-04-01