【摘要】 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。更多还原

【Abstract】 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.更多还原