利用体全息相关器实现车辆牌照旋转不变识别  

Rotation-invariance Recognition in Registration Mark Using Volume Holographic Correlator

作　　者：冯升同[1] 欧阳荣[1] 王大勇[2] 

机构地区：[1]北京石油化工学院数理系,北京102617 [2]北京工业大学应用数理学院,北京100022

出　　处：《北京石油化工学院学报》2007年第3期22-25,共4页Journal of Beijing Institute of Petrochemical Technology

摘　　要：为了使用综合判别函数作为输入在光折变晶体中记录匹配滤波器,利用不同旋转角度的参考图像集训练出该图像的综合判别函数,再通过角度复用存储在晶体中,从而构建出一个体全息旋转不变光学相关器。同时,在光路中直接引入光学子波滤波器,大大地提高了相关器的判别能力。实验结果表明上述方法可以较好地完成车辆牌照旋转不变识别。In this paper,it is proposed to record the matched filter in the photorefractive crystal by using the synthetic discriminant function（SDF） as the input.The SDF is generated by training a set of rotated reference images.Multiple matched filters are stored by angle-multiplexing in the same volume.In order to improve the discriminability,an optical wavelet transform filter is directly introduced into the experimental setup.Experimental results demonstrate that it is possible to achieve the rotation-invariance pattern recognition in registration mark with the proposed method.

关 键 词：体全息存储 综合判别函数 光学子波变换 旋转不变性 模式识别 

分 类 号：TP333.42[自动化与计算机技术—计算机系统结构]