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多重频谱滤波法改进体全息存储图像相关识别
引用本文:王大勇,陈孙征,袁玮,万玉红,江竹青,陶世荃.多重频谱滤波法改进体全息存储图像相关识别[J].光电子.激光,2004,15(6):719-723.
作者姓名:王大勇  陈孙征  袁玮  万玉红  江竹青  陶世荃
作者单位:北京工业大学应用数理学院,北京,100022
基金项目:国家重点基础研究与发展计划(973)资助项目(G19990330),北京市教委科技发展计划资助项目(2002KJ002),北京市科技新星资助项目(952872100)
摘    要:采用体全息存储器建立图像数据库,存储器件是立方形掺铁铌酸锂(Fe:LiNbO3)晶体,1020幅汉字图像通过水平和垂直的角度复用技术以及顺序曝光法记录在晶体的同一点中,可以实现并行相关运算。提出了多重频谱滤波方法,有效地抑制直流分量和噪声,使相关峰陡峭,自相关峰值与背景平均值之比约为4.2,极大地提高了体全息存储相关器的识别精度。

关 键 词:全息存储器  图像数据库  角度复用  顺序曝光法  并行相关运算  多重频谱滤波  自相关峰值  识别精度
文章编号:1005-0086(2004)06-0719-05

Multiple-spectrum Filtering for Improvement of Volume Holographic Correlator
WANG Da-yong.Multiple-spectrum Filtering for Improvement of Volume Holographic Correlator[J].Journal of Optoelectronics·laser,2004,15(6):719-723.
Authors:WANG Da-yong
Affiliation:WANG Da-yong~
Abstract:An image database was constructed by using the volume holographic memory.The memory device is a cubic Fe:LiNbO_3 crystal.1020 Chinese images are stored into a single location in the crystal through the angularly-multiplexing and subsequence exposure.An input object can be correlated with all the stored images simultaneously to achieve pattern recognition.Also,a novel multiple-spectrum filtering was proposed to suppress the DC term and the noise.The experimental results showed that the method made the auto-correlation peak sharper,the ratio of the autodcorrelation peak over the mean of the output background is about 4.2,and the discrimination of the system was improved.
Keywords:optical correlator  holographic memory  multiple-spectrum  pattern recognition
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