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1. 发明申请

WO2009075505A3 WEIGHTED PIXEL INTERPOLATION METHOD FOR RECTILINEAR AND POLAR IMAGE CONVERSION 审中-公开
标题翻译：一种用于近似极化图像转换的加权像素插值方法
公开(公告)号：WO2009075505A3
公开(公告)日：2009-08-06
申请号：PCT/KR2008007269
申请日：2008-12-09
申请人： IRITECH INC , CHOI HYEONG IN , KOWN SONG HWA , KIM DAE HOON , PARK YANG HYEONG , SOHN JUNG KYO
发明人： CHOI HYEONG IN , KOWN SONG HWA , KIM DAE HOON , PARK YANG HYEONG , SOHN JUNG KYO
IPC分类号： G06T5/00
CPC分类号： G06K9/0061 , G06T3/00
摘要： The present invention relates to a weighted pixel interpolation method for improving an iris recognition rate, in which an iris image comprising the radius of an outer circle including the entire iris image and the radius of an inner circle placed within a pupil where the iris image is not included is stored, and iris image data is processed while minimizing the volume of an image file that is important in iris recognition. In the weighted pixel interpolation method of the present invention, when an iris image acquired from a camera is transformed from an orthogonal coordinate to a polar coordinate or from a polar coordinate to an orthogonal coordinate in the process of recognizing an iris, an image pixel in a coordinate system does not match or correspond to an image pixel in the other coordinate system, and thus an iris recognition rate is degraded. In order to prevent degradation of the iris recognition rate, all of image pixel values affecting one another should be considered when an image pixel is transformed from a polar coordinate Pi,j to an orthogonal coordinate Ra,B or from an orthogonal coordinate Ra,B to a polar coordinate Pi,j, and thus a weighting factor according to the present invention is applied to correct a pixel when the pixel is transformed from a polar coordinate Pi,j to an orthogonal coordinate Ra,B or from an orthogonal coordinate Ra,B to a polar coordinate Pi,j in the process of iris recognition.
摘要翻译：本发明涉及一种用于改善虹膜识别率的加权像素插值方法，其中包括包括整个虹膜图像的外圆的半径的虹膜图像和放置在虹膜图像是瞳孔内的内圆的半径不包括的信息被存储，并且虹膜图像数据被处理，同时最小化在虹膜识别中重要的图像文件的音量。在本发明的加权像素内插方法中，在识别虹膜的过程中，当从相机获取的虹膜图像从正交坐标变换为极坐标或从极坐标变换为正交坐标时，坐标系与另一坐标系中的图像像素不匹配或对应，因此虹膜识别率降低。为了防止虹膜识别率的下降，当图像像素从极坐标Pi，j变换到正交坐标Ra，B或者从正交坐标Ra，B变换时，应当考虑彼此相互影响的所有图像像素值到极坐标Pi，j，因此当像素从极坐标Pi，j变换到正交坐标Ra，B或从正交坐标Ra时，应用根据本发明的加权因子来校正像素， B到虹膜识别过程中的极坐标Pi，j。

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