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Optical Engineering

Characterization method for a multispectral high-dynamic-range imaging system
Author(s): Duck Bong Kim; Kwan H. Lee
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Paper Abstract

An accurate characterization method for a multispectral high-dynamic-range (HDR) imaging system is proposed by combining multispectral and HDR imaging technologies. The multispectral HDR imaging system, which can acquire the visible spectrum at many wavelength bands, can provide an accurate color reproduction and physical radiance information of real objects. An HDR camera is used to capture an HDR image without multiple exposures and a liquid crystal tunable filter (LCTF) is used to generate multispectral images. Due to its several limitations in the multispectral HDR imaging system, a carefully designed and an innovative characterization algorithm is presented by considering a logarithmic camera response of the HDR camera and different spectral transmittance of the LCTF. The proposed method efficiently and accurately recovers the full spectrum from the multispectral HDR images using a transformation matrix and provides device-independent color information (e.g., CIEXYZ and CIELAB). The transformation matrix is estimated by training the estimated sensor responses from a multispectral HDR imaging system and the reflectance measurements from a spectroradiometer using Moore–Penrose pseudoinverse matrix.

Paper Details

Date Published: 23 July 2014
PDF: 10 pages
Opt. Eng. 53(7) 074111 doi: 10.1117/1.OE.53.7.074111
Published in: Optical Engineering Volume 53, Issue 7
Show Author Affiliations
Duck Bong Kim, Gwangju Institute of Science and Technology (Korea, Republic of)
Kwan H. Lee, Gwangju Institute of Science and Technology (Korea, Republic of)

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