Abstract: Image pre-processing is the most important step of iris recognition. According to the characteristics of iris image, to solve low operation speed and robustness of iris recognition, this paper proposes a locating arithmetic based on Canny operator and Hough transform, then uses Daugman’s protectin model to normalize and enhance the image by histogram equalization. The experiment result shows that the iris image pre-processing arithmetic proposed in this paper can solve the problem of low operation speed and robustness efficiently, and also can improve the stability and recognition rate of the iris recognition system.

Key words: iris, image pre-processing, image locating, normalization, image enhancing