掌纹身份识别系统中的定位分割技术

The Orientation and Segmentation Technologies in Palmprint-Based Identification Systems

重点研究在线掌纹的定位与归一化方法 ,结合在线掌纹图象的特点采用灰度形态梯度提取掌纹的轮廓线 ,然后通过考察以轮廓点为中心的圆盘内目标及背景所占面积的大小来提取定位掌纹所需要的特征点 。

The purposes of orientating palmprint images are to set up a coordinate system to normalize the palmprint images,to reduce the nonlinear interference of rotation,translation and distortion caused in the capture process,and to improve the recognition rate.According to the characteristics of online palmprint images,in this paper,the contour lines are traced out by gray morphological grads,and then,the key points are extracted out by the ratio of the palm's area to the background's area in a circle centered at contour lines.Experiments show that the methods are feasible.