Abstract: Aiming at the problem of inaccurate locating of traditional iris locating algorithms， an improved YOLOV3 iris locating model is proposed to improve the accuracy of iris locating and make it better applied to production practice. Using the Densenet-121 model as the feature extraction module， and on the basis of it， the auxiliary network is obtained by copying the backbone network to make it more conducive to the detection of small targets， and the non-local attention mechanism is used to enhance the semantic information of the features obtained by the image. The YOLOV3 model， Daugman model and Wilde model based on DarkNet-53 are used for comparative experiments. The experimental results show that the accuracy of the experimental model in this paper is as high as 97.1% in iris locating， which has obvious advantages compared with other iris locating models.

Key words: YOLOV3; iris registration; feature extraction; object detection; attention mechanism