Previous works about iris recognition stages

By increasing security requirements, biometric as a perfect solution for people identification is used. One of the biometrics which is considered as the most accurate and reliable method, is iris biometric. The iris biometric is about analysis of patterns in the iris texture. The operation can be done in several stages. Image acquisition, preprocessing and main processing including segmentation, normalization, feature extraction and matching are different stages of iris recognition. In this paper the previous works for different stages are proposed separately and classified, with the appropriate tables. Since there are many different methods for iris recognition, this survey covers some of the significant methods.