说明：  图像识别的MATLAB代码，包括人脸识别和虹膜识别，在数字图像中虹膜位置的有效定位是虹膜识别的关键问题。用一种基于主动轮廓线模型的方法定位虹膜的位置，先用灰度投影法检测出瞳孔内的一点作为瞳孔的伪圆心，该圆心只要能落在瞳孔内部即可。
(Matlab source code of image recognition, including face recognition and iris recognition, iris position in the digital image in an effective location is the key problem of iris recognition. With an active contour model based method to locate the position of the iris, the first gray projection method used to detect a point inside the pupil as a pupil of the pseudo-center, the center can be as long as fall within the pupil.)