12-01-2013, 03:29 PM
Enhanced Iris Recognition System for Blind peoples
Enhanced Iris Recognition System.doc (Size: 1.14 MB / Downloads: 48)
Abstract-
-Iris recognition is an intrinsic human organ, capturing of eye image then locate iris from the eye color image extract the features finally match with database. for theses process the first step to preprocessing the color image, the second step to locate the iris using the canny edge filter which locate the inner boundary of iris and outer boundary of iris can be identify by huge variation in the intensity value, the third step to convert Cartesian form into polar form using rubber sheet modal suggested by Daugman now the iris color image ready to match with database this system having feature extraction like color, texture and edge should be matched with database. The process is for contact lens and disease affected problem also addition to this we are having the iris sharpness and image enhancement technique to overcome the problems. Another important aspect of this system for the color image processing own database has been created for this process under the guideless of doctor and image samples taken from the hospital those who are willing to give there eyes for research. Efficiency of this system can be justified by the result of comparison between gray and color image processing.
INTRODUCTION
The eye is not properly a sphere; rather it is a fused two-piece unit. The smaller frontal unit, more curved, called the cornea is linked to the larger unit called the sclera. The corneal segment is typically about 8 mm (0.3 in) in radius. The sclera constitutes the remaining five-sixths; its radius is typically about 12 mm. The cornea and sclera are connected by a ring called the limbus. The iris – the color of the eye – and its black center, the pupil, are seen instead of the cornea due to the cornea's transparency. To see inside the eye, an ophthalmoscope is needed, since light is not reflected out. The fundus (area opposite the pupil) shows the characteristic pale optic disk (papilla), where vessels entering the eye pass across and optic nerve fibers depart the globe [1].The dimensions differ among adults by only one or two millimeters. The vertical measure, generally less than the horizontal distance, is about 24 mm among adults, at birth about 16–17 mm. (about 0.65 inch) The eyeball grows rapidly, increasing to 22.5–23 mm (approx. 0.89 in) by the age of three years. From then to age 13, the eye attains its full size. The volume is 6.5 ml (0.4 cu. in.) and the weight is 7.5 g. (0.25 oz.).The eye is made up of three coats, enclosing three transparent structures. The outermost layer is composed of the cornea and sclera. The middle layer consists of the choroid, ciliary body, and iris. The innermost is the retina, which gets its circulation from the vessels of the choroid as well as the retinal vessels, which can be seen in an ophthalmoscope. Within these coats are the aqueous humor, the vitreous body, and the flexible lens. The aqueous humor is a clear fluid that is contained in two areas: the anterior chamber between the cornea and the iris and exposed area of the lens. The lens is suspended to the ciliary body by the suspensory ligament (Zonule of Zinn), made up of fine transparent fibers. The vitreous body, the posterior chamber, is a clear jelly that is much larger than the aqueous humor, present behind lens and the rest, and is bordered by the sclera, zonule, and lens. They are connected via the pupil [2]. The biometric person authentication technique based on the pattern of the human iris is well suited to be applied to any access control system requiring a high level of security.
PROPOSED SYSTEM
The system is having basic structure is shown below the fig. 1 initially we should acquired the image then image is process in two various flow of recognition first flow is in gray scale image at the same time second flow is in color image then finally match the result of both the color image as well as gray scale how color image is accurate.
CONCLUSION
The iris recognition is one of the best security system in present technology to give more strength to that technology using color image processing in iris recognition give very effective result when compare to the gray scale processing in iris recognition from the result itself it is justify and also from the color image processing we can identify the contact lens problem easily.