Agile spectrum imaging: Programmable wavelength modulation for cameras and projectors

Ankit Mohan, Ramesh Raskar, Jack Tumblin

Research output: Contribution to journalConference articlepeer-review

41 Scopus citations


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 tradeoffs 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.

Original languageEnglish (US)
Pages (from-to)709-717
Number of pages9
JournalComputer Graphics Forum
Issue number2
StatePublished - 2008
Event29th Annual Conference on European Association for Computer Graphics, EUROGRAPHICS 2008 - Crete, Greece
Duration: Apr 14 2008Apr 18 2008

ASJC Scopus subject areas

  • Computer Graphics and Computer-Aided Design


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