According to previous studies, the measurement of the human iris pigmentation can be exploited to detect certain eye pathological conditions in their early stage. In this paper, we propose an instrument and a method to perform hyperspectral quantitative measurements of the iris spectral reflectance. The system is based on a simple imaging setup, which includes a monochrome camera mounted on a standard ophthalmic microscope movement controller, a monochromator, and a flashing LED-based slit lamp. To assure quantitative measurements, the system is properly calibrated against a NIST reflectance standard. Iris reflectance images can be obtained in the spectral range 495-795 nm with a resolution of 25 nm. Each image consists of 1280 x 1024 pixels having a spatial resolution of 18 μm. Reflectance spectra can be calculated both from discrete areas of the iris and as the average of the whole iris surface. Preliminary results suggest that hyperspectral imaging of the iris can provide much more morphological and spectral information with respect to conventional qualitative colorimetric methods.

A hyperspectral imaging system for the evaluation of the human iris spectral reflectance / DI CECILIA, Luca; Marazzi, Francesco; Rovati, Luigi. - 10045(2017), p. 100451S. ((Intervento presentato al convegno SPIE Photonic West 2017 tenutosi a S. Francisco nel January 28, 2017 [10.1117/12.2252184].

A hyperspectral imaging system for the evaluation of the human iris spectral reflectance

DI CECILIA, LUCA;MARAZZI, FRANCESCO;ROVATI, Luigi
2017

Abstract

According to previous studies, the measurement of the human iris pigmentation can be exploited to detect certain eye pathological conditions in their early stage. In this paper, we propose an instrument and a method to perform hyperspectral quantitative measurements of the iris spectral reflectance. The system is based on a simple imaging setup, which includes a monochrome camera mounted on a standard ophthalmic microscope movement controller, a monochromator, and a flashing LED-based slit lamp. To assure quantitative measurements, the system is properly calibrated against a NIST reflectance standard. Iris reflectance images can be obtained in the spectral range 495-795 nm with a resolution of 25 nm. Each image consists of 1280 x 1024 pixels having a spatial resolution of 18 μm. Reflectance spectra can be calculated both from discrete areas of the iris and as the average of the whole iris surface. Preliminary results suggest that hyperspectral imaging of the iris can provide much more morphological and spectral information with respect to conventional qualitative colorimetric methods.
SPIE Photonic West 2017
S. Francisco
January 28, 2017
10045
100451S
DI CECILIA, Luca; Marazzi, Francesco; Rovati, Luigi
A hyperspectral imaging system for the evaluation of the human iris spectral reflectance / DI CECILIA, Luca; Marazzi, Francesco; Rovati, Luigi. - 10045(2017), p. 100451S. ((Intervento presentato al convegno SPIE Photonic West 2017 tenutosi a S. Francisco nel January 28, 2017 [10.1117/12.2252184].
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11380/1134006
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