| 离焦模糊虹膜图像的功率谱检焦方法 |
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| 引用本文： | 左平,冯雪,陈守东,刘天宝,秦丹丹,申延成.离焦模糊虹膜图像的功率谱检焦方法[J].吉林大学学报(理学版),2012,50(4):745-749. |
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| 作者姓名： | 左平 冯雪 陈守东 刘天宝 秦丹丹 申延成 |
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| 作者单位： | 1. 吉林大学 商学院, 长春 130012,2. 空军航空大学 基础部, 长春 130022 |
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| 基金项目： | 国家自然科学基金，教育部人文社会科学研究基地重大项目 |
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| 摘 要： | 通过研究离焦模糊虹膜图像功率谱与离焦量间的关系, 建立了每幅虹膜图像的检焦评价函数值PS与图像模糊半径的关系曲线. 实验结果表明: 功率谱评价函数能够检测系统是否合焦, 并通过最清晰图像找到系统调焦镜的位置; 对评价函数曲线进行Gauss拟合的曲线相关系数为0.994 7（接近1）, 验证了功率谱检焦评价函数检焦的准确率.
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| 关 键 词： | ,离焦模糊虹膜图像,功率谱,检焦评价函数, |
Power Spectrum Autofocusing Methods of Defocus Blurred Iris Image |
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| ZUO Ping
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FENG Xue
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CHEN Shou-dong
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LIU Tian-bao
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QIN Dan-dan
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SHEN Yan-cheng.Power Spectrum Autofocusing Methods of Defocus Blurred Iris Image[J].Journal of Jilin University: Sci Ed,2012,50(4):745-749. |
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| Authors: | ZUO Ping FENG Xue CHEN Shou-dong LIU Tian-bao QIN Dan-dan SHEN Yan-cheng |
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| Institution: | 1. College of Business, Jilin University, Changchun 130012, China;
2. Department of Foundation, Aviation University of Air Force, Changchun 130022, China |
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| Abstract: | The authors proposed a power spectrum autofocusing method based on defocus iris images.Firstly,we gave the relation curve between autofocusing evaluation function value PS and blur radius of each iris image.Experiments show that the power spectrum evaluation function could find the location of system focusing mirror when the image is clearest.Moreover,we dealt with evaluation function curve by means of Gaussian fitting,and the relation number of the curve could reach 0.994 7(close to 1),verifying the accuracy of the power spectrum autofocusing evaluation function. |
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| Keywords: | defocus blurred iris image power spectrum autofocusing evaluation function |
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