高准确度实时指纹识别系统

Real-time Fingerprint Identification System with High Discriminability

利用二值化联合变换相关技术成功地设计了一个单空间光调制器、单CCD的光电混合实时指纹识别系统。通过对空间光调制器在傅氏谱平面的灰度动态范围进行调节 ,控制了通过整个系统的光能量 ,使得系统能够实时运行。利用离散余弦变换算法对联合变换功率谱进行数字处理 ,增强傅里叶面的互相关项 ,消除自相关项 ,提高了系统的识别能力。采用一种新的双参数判别方法对相关信号进行判别 ,提高了判别的准确度。实际测试结果表明 ,该识别系统的错误拒绝率为 0 47% ,错误接受率为 0。

A real-time fingerprint identification system using binary joint transform correlator with a single space light modulator and a single CCD has been developed successfully. A discrete cosine transform algorithm was used to process the joint power spectrum in order to enhance the cross-correlator term and eliminate the auto-correlator term in the joint power spectrum and improve the discriminability of the system. The light energy passing through the system was controlled by adjusting the gray-value range of the space light modulator at Fourier plane, as a result the system could execute real-time fingerprint identification. A new two-parameter decision method was used to decide the correlator signal, and the deciding veracity was improved. Real-time tests yielded a false rejection rate of 0.47% and a false acceptance rate of zero.