Tilt and scale invariant iris recognition system

Iris recognition system is the secure authentication tool to control access to physical assets based on iris texture. It is the most reliable biometric system because of its uniqueness and stability over time, even the genetically identical twins have different Iris textures. This paper presents a system that is immune to tilt and scale variations. The iris region of interest is segmented based on selective cropping. Scale variation is compensated during normalization by fixing the pupil radius. A novel technique has been proposed to compensate for tilt variations. Template matching is performed by bit to bit comparisons.