An Efficient Automatic Iris Image Acquisition and Preprocessing System

An efficient technique on iris image acquisition, iris de-nosing, iris localization, and quality assessment is proposed in this paper. An automatic focusing system based on a decision function is introduced into the iris acquisition device to achieve the feedback control, which can capture the high resolution iris image with real-time. Iris localization differs from previous iris localization schemes in that it combines iris acquisition with edge detection technique. On the basis of coarse detection, the iris accurate detection is based on the combination of wavelet-based least square method, Laplacian of Gaussian function and an improved Hough transform. Experimental results show that the technique has a good performance, which can not only capture high quality iris image, but also improve the speed and accuracy or iris localization