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Practical Spectral Photography
Author(s) -
Habel Ralf,
Kudenov Michael,
Wimmer Michael
Publication year - 2012
Publication title -
computer graphics forum
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 120
eISSN - 1467-8659
pISSN - 0167-7055
DOI - 10.1111/j.1467-8659.2012.03024.x
Subject(s) - rendering (computer graphics) , photography , computer science , spectral imaging , spectral resolution , computer vision , computational photography , image resolution , artificial intelligence , digital camera , spectrometer , optics , computer graphics (images) , remote sensing , image processing , spectral line , image (mathematics) , physics , geology , art , astronomy , visual arts
We introduce a low‐cost and compact spectral imaging camera design based on unmodified consumer cameras and a custom camera objective. The device can be used in a high‐resolution configuration that measures the spectrum of a column of an imaged scene with up to 0.8 nm spectral resolution, rivalling commercial non‐imaging spectrometers, and a mid‐resolution hyper spectral mode that allows the spectral measurement of a whole image, with up to 5 nm spectral resolution and 120×120 spatial resolution. We develop the necessary calibration methods based on halogen/fluorescent lamps and laser pointers to acquire all necessary information about the optical system. We also derive the mathematical methods to interpret and reconstruct spectra directly from the Bayer array images of a standard RGGB camera. This objective design introduces accurate spectral remote sensing to computational photography, with numerous applications in color theory, colorimetry, vision and rendering, making the acquisition of a spectral image as simple as taking a high‐dynamic‐range image.