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Measuring and Analyzing the Colour of the Iris with a Multi-Spectral Imaging System

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In this work we evaluate the spectral reflectance and colour associated to the human iris. Some prosthesis used in the clinical practice and cosmetic coloured contact lenses are also analyzed. Specifically 100 real irises corresponding to 50 patients, 68 fake eye balls and 17 coloured contact lenses have been studied. The spectral reflectance profiles in the visible range of these samples have been measured by means of a multi-spectral system developed for this purpose. The system consists of a 12-bit digital CCD camera and an RGB tunable filter, which allows the acquisition of a magnified image of the patient's eye and the reconstruction of the associated spectra by means of the Moore-Penrose pseudo-inverse method. The true spectral reflectances of the samples are also measured using a conventional tele-spectracolorimeter. The measured and reconstructed spectra are compared using the CIEDE2000 colour difference formula as well as the Root Mean Square Error (RMSE). The results obtained show that the system allows the reconstruction of the curves associated to human irises, fake eye balls, and coloured contact lenses with a high accuracy, mainly when the system is trained using the human irises database.
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Document Type: Research Article

Publication date: January 1, 2008

More about this publication?
  • Started in 2002 and merged with the Color and Imaging Conference (CIC) in 2014, CGIV covered a wide range of topics related to colour and visual information, including color science, computational color, color in computer graphics, color reproduction, volor vision/psychophysics, color image quality, color image processing, and multispectral color science. Drawing papers from researchers, scientists, and engineers worldwide, DGIV offered attendees a unique experience to share with colleagues in industry and academic, and on national and international standards committees. Held every year in Europe, DGIV papers were more academic in their focus and had high student participation rates.

    Please note: For purposes of its Digital Library content, IS&T defines Open Access as papers that will be downloadable in their entirety for free in perpetuity. Copyright restrictions on papers vary; see individual papers for details.

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