CAJ | 학술논문

为了实现对虹膜内外边界的精确定位，提出了改进的虹膜图像定位算法。虹膜图像预处理过程主要包括虹膜边界定位、归一化处理和图像增强三部分，其中虹膜图像边界定位是实现虹膜识别的重要前提。首先使用质心探测法确定其二值化虹膜图像的内边界中心，然后再对内边界进行曲线拟合，从而实现对虹膜内边界的定位。使用Canny算子进行边缘检测，确定虹膜图像外边界，完成对虹膜边界的定位。使用Rubber‐sheet模型对经过定位的虹膜区域图像进行归一化处理，方便虹膜图像的信息提取和编码匹配。实验证明改进的算法有效提高了虹膜图像预处理效率。
위료실현대홍막내외변계적정학정위，제출료개진적홍막도상정위산법。홍막도상예처리과정주요포괄홍막변계정위、귀일화처리화도상증강삼부분，기중홍막도상변계정위시실현홍막식별적중요전제。수선사용질심탐측법학정기이치화홍막도상적내변계중심，연후재대내변계진행곡선의합，종이실현대홍막내변계적정위。사용Canny산자진행변연검측，학정홍막도상외변계，완성대홍막변계적정위。사용Rubber‐sheet모형대경과정위적홍막구역도상진행귀일화처리，방편홍막도상적신식제취화편마필배。실험증명개진적산법유효제고료홍막도상예처리효솔。
In order to achieve the accurate irts boundary locallzation ,the image positioning algorithm is put forward .The process of iris image preprocessing mainly includes three parts ,iris boundary localiza‐tion ,normalization and image enhancement .The boundary localization is the important prerequisite to a‐chieve iris recognition .Firstly ,uses the centroid detection to determine the center of the binary iris im‐age ,then does curve fitting for the inner boundary ,and get the iris image′s inner boundary .Through Canny operator to determine the iris image′s outer boundary , and completed the localization of iris boundaries .Uses Rubber‐sheet model to do normalization process for the localized area of iris image which is convenient of the iris image information extraction and encoding match .Experiments show that the improved algorithm effectively improved the efficiency of iris image preprocessing .