Characterization of the human iris spectral reflectance with a multispectral imaging system.

We present a multispectral system developed and optimized for measurement of the spectral reflectance and the color of the human iris. We tested several sets of filters as acquisition channels, analyzed different reconstruction algorithms, and used different samples as training sets. The results obtained show that a conventional three-channel color camera (RGB) was enough to reconstruct the analyzed reflectances with high accuracy, obtaining averaged color differences of around 2-3 CIEDE2000 units and root mean square errors of around 0.01. The device developed was used to characterize 100 real irises corresponding to 50 subjects, 68 prostheses used in clinical practice, and 17 cosmetic colored contact lenses.

[1]  L Dandona,et al.  Population-based assessment of childhood blindness in southern India. , 1998, Archives of ophthalmology.

[2]  Raimondo Schettini,et al.  Training Set and Filters Selection for the Efficient Use of Multispectral Acquisition Systems , 2004, CGIV.

[3]  Roy S. Berns,et al.  A feasibility study of spectral color reproduction , 2003 .

[4]  Roy S. Berns,et al.  Comparative Study of Metrics for Spectral Match Quality , 2002, CGIV.

[5]  Wencheng Wu,et al.  The CIEDE2000 color-difference formula: Implementation notes, supplementary test data, and mathematical observations , 2005 .

[6]  J. IJspeert,et al.  Dependence of intraocular straylight on pigmentation and light transmission through the ocular wall , 1991, Vision Research.

[7]  J. Weiter,et al.  Relationship of senile macular degeneration to ocular pigmentation. , 1985, American journal of ophthalmology.

[8]  David Connah,et al.  Multispectral Imaging: How Many Sensors Do We Need? , 2004, Color Imaging Conference.

[9]  I H Wallow,et al.  Melanocytes and iris color. Light microscopic findings. , 1996, Archives of ophthalmology.

[10]  Qun Sun,et al.  Imaging Flesh: Skin-customized Profiling , 2008, CGIV/MCS.

[11]  Kenneth H. Neidner.  Light microscopic findings , 1988 .

[12]  Jaume Pujol,et al.  Estimation of Human Iris Spectral Reflectance Using a Multi-Spectral Imaging System , 2006, CGIV.

[13]  Jaume Pujol,et al.  Optimized algorithm for the spatial nonuniformity correction of an imaging system based on a charge-coupled device color camera. , 2007, Applied optics.

[14]  Manuel Melgosa,et al.  Towards a colorimetric characterization of the human iris. , 2000 .

[15]  M. de Lasarte,et al.  Color measurements with colorimetric and multispectral imaging systems , 2006, Electronic Imaging.

[16]  Hans Brettel,et al.  Multispectral color image capture using a liquid crystal tunable filter , 2002 .

[17]  Jaume Pujol,et al.  Multispectral system for reflectance reconstruction in the near-infrared region. , 2006, Applied optics.

[18]  R. Berns,et al.  A Comparative Analysis of Spectral Reflectance Estimated in Various Spaces Using a Trichromatic Camera System , 2000, Journal of Imaging Science and Technology.

[19]  M. Sandberg,et al.  Iris pigmentation and extent of disease in patients with neovascular age-related macular degeneration. , 1994, Investigative ophthalmology & visual science.

[20]  R D Sperduto,et al.  Evaluation of an iris color classification system. The Eye Disorders Case-Control Study Group. , 1990, Investigative ophthalmology & visual science.