无耦合PCNN频域特性分析  

Frequency Domain Characteristics Analysis of Non-Coupled PCNN

作　　者：邓翔宇 吕亚辉 陈岩 DENG Xiangyu;Lü Yahui;CHEN Yan(College of Physics and Electronic Engineering,Northwest Normal University,Lanzhou 730070,China)

机构地区：[1]西北师范大学物理与电子工程学院,兰州730070

出　　处：《计算机工程》2022年第6期213-221,共9页Computer Engineering

基　　金：国家自然科学基金(61961037);甘肃省高等学校产业支撑计划项目(2021CYZC-30);西北师范大学研究生培养与课程改革项目。

摘　　要：脉冲耦合神经网络(PCNN)模型具有脉冲调制和耦合连接特性,广泛应用于数字图像处理领域。然而现有PCNN模型的研究都是从时域或图像本身包含信息角度分析参数与模型特性之间的关系,无法全面解释参数对模型特性的影响。从PCNN模型的迭代方程出发,利用离散系统频域分析方法从频域角度对无耦合PCNN模型进行分析,揭示无耦合PCNN模型的动态门限子系统具有低通特性,并确定网络参数aE的选取范围,同时通过对脉冲发放时刻公式进行推导,得到参数vE的选取范围。采用傅里叶变换方法分析单个神经元的脉冲发放频率特性和动态门限衰减频率特性,解释无耦合PCNN模型的参数对频域特性的影响。仿真实验结果验证了该理论分析结论的正确性,从频域角度理解无耦合PCNN模型的参数与模型特性之间的关系,为挖掘PCNN模型特性提供一种新的方法。The Pulse Coupled Neural Network(PCNN)model is characterized by pulse modulation and coupling connection,which is widely used in the field of digital image processing.However,the existing research on the PCNN model focuses on analyzing the relationship between the parameters and model characteristics from the perspective of time domain or the information contained in the image itself,which cannot fully explain the influence of the parameters on the model characteristics.Starting from the iterative equation of the PCNN model,this study analysis the non-coupled PCNN model in the frequency domain using the discrete system frequency domain analysis method.The results revealed that the dynamic threshold subsystem of the non-coupled PCNN model has low-pass characteristics,and the selection range of model parameters aEis determined.Meanwhile,through the derivation of the pulse firing time formula,the selection range of the parameters vEis obtained.The Fourier transform method is used to analyze the pulse firing frequency characteristics and dynamic threshold attenuation frequency characteristics of a single neuron,and to explain the influence of the network parameters of non-coupled PCNN model on the frequency domain characteristics of the network.The simulation results verify the correctness of the theoretical analysis’conclusion.The theoretical analysis clarifies the relationship between non-coupled PCNN model parameters and network characteristics from the perspective of frequency domain and provides a new method for mining noncoupled PCNN model characteristics.

关 键 词：脉冲耦合神经网络 动态门限子系统 傅里叶变换 脉冲发放频率 动态门限衰减频率 

分 类 号：TP183[自动化与计算机技术—控制理论与控制工程] TP391[自动化与计算机技术—控制科学与工程]