11-Biometrics-Lecture-11-Part1-2008-12-01

11-Biometrics-Lecture-11-Part1-2008-12-01 - Master SC...

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1 Biometrics http://scgwww.epfl.ch/courses Master SC – Information and Communication Security Dr. Andrzej Drygajlo Speech Processing and Biometrics Group Signal Processing Institute Ecole Polytechnique Fédérale de Lausanne (EPFL) Center for Interdisciplinary Studies in Information Security (ISIS)
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2 Biometrics - Contents Fundamentals of Biometrics Analysis, Modeling and Interpretation of Biometric Data Leading Biometric Technology Multimodal Biometrics Biometric Standards Small, Medium and Large Scale Biometric Systems Integration of biometrics with other existing technologies Behavioral Biometrics Securing Biometric Data and Systems Biometric Encryption Biometric Applications Privacy and Legal Issues
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3 Speaker Recognition Dynamic Signature Fingerprints Iris Face Hand Others Multimodal Biometrics Leading Biometric Technology DNA
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4 Retina Every eye has its own totally unique pattern of blood vessels. The eye shares the same stable environment as the brain and among physical features unique to individuals, none is more stable than the retinal vascular pattern. Because of its internal location, the retina is protected from variations caused by exposure to the external environment (as in the case of fingerprints, etc.)
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5 Optic nerve, fovea and macula In the center of the retina is the optic nerve , a circular to oval white area measuring about 2 x 1.5 mm across From the center of the optic nerve radiate the major blood vessels of the retina Approximately 4.5-5 mm to the left of the disc, can be seen the slightly oval-shaped, blood vessel-free reddish spot, the fovea , which is at the center of the area known as the macula by ophthalmologists Macula
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6 Eye and scan circle (area band) The retina is essentially transparent to infrared wavelength of light. The mat of vessels of the choroid just behind the retina reflect most of the useful information used to recognize individuals.
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7 Retina/Choroid
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8 Blood supply to the retina There are two sources of blood supply to the mammalian retina: the central retinal artery and the choroidal blood vessels . The choroid receives the greatest blood flow (65-85%) and is vital for the maintainance of the outer retina (particularly the photoreceptors) The remaining 20-30% flows to the retina through the central retinal artery from the optic nerve head to nourish the inner retinal layers. The central retinal artery has 4 main branches in the human retina.
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9 Retina Scan (EyeKey) Infrared camera’s (retinascope) light source is projected onto the subject’s retina and detects the return light. The representation of retina consists of the contrast data in the time domain. Matching process
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11-Biometrics-Lecture-11-Part1-2008-12-01 - Master SC...

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