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应用于虹膜采集装置的自动对焦算法
引用本文:侯文君,李杨,都思丹.应用于虹膜采集装置的自动对焦算法[J].光电工程,2008,35(6):119-123.
作者姓名:侯文君  李杨  都思丹
作者单位:南京大学,电子科学与工程系,南京,210093
摘    要:针对自动虹膜图像采集装置的成像特点,本文提出了一种新的基于对焦深度法的自动对焦算法.该算法根据自动虹膜相机小景深的特点,提出应用图像的ULFM作为清晰度评价函数,并采用粗对焦和精确对焦相结合的二级对焦策略.实际虹膜图像采集系统实验结果表明,算法精度高、鲁棒性强、实时性好,在被摄人距离镜头0.5~2m的情况下,系统都能够准确地拍摄到清晰的可供识别的虹膜图像,一次对焦成功率大于95%.

关 键 词:虹膜图像采集  自动对焦  图像清晰度  评价算子  应用图像  虹膜图像  采集装置  自动  对焦算法  Imaging  System  Iris  成功率  识别  系统实验  情况  镜头  距离  实时性  鲁棒性  算法精度  结果  图像采集  策略  结合
收稿时间:2007/10/23

Auto-focusing Algorithm for Iris Imaging System
HOU Wen-jun,LI Yang,DU Si-dan.Auto-focusing Algorithm for Iris Imaging System[J].Opto-Electronic Engineering,2008,35(6):119-123.
Authors:HOU Wen-jun  LI Yang  DU Si-dan
Affiliation:HOU Wen-jun,LI Yang,DU Si-dan ( Department of Electronic Science , Engineering,Nanjing University,Nanjing 210093,China )
Abstract:A new auto-focusing algorithm based on Depth from Focus (DFF) was presented according to the properties of the automatic iris imaging system. The algorithm used the ULFM value of the image as the sharpness evaluation function on the basis of the fact that the automatic iris cameras have small depth of field, and employed a two-step auto-focusing strategy by combining coarse focusing with fine focusing. Experiments of automatic iris imaging system prove that the auto-focusing algorithm proposed is of high pr...
Keywords:iris imaging  auto-focusing  image sharpness  evaluation operator  
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