斜变滤波器频域加窗对图像重建的影响

摘要

斜变滤波器的性能对图像重建有重要的影响，频域加窗设计法是其主要的设计方法。设计了4种经典的加窗滤波器：RL 滤波器、SL 滤波器、Hamming 窗滤波器和指数窗滤波器。从单位冲激响应和频率响应2个方面分析了这4种滤波器的特性；从频率响应和旁瓣衰减速度2个方面比较了这4种滤波器。理论分析与仿真结果表明：指数窗滤波器的震荡噪声最小；SL 滤波器整体最优。%The performance of the ramp filter has an important influence on image reconstruction. The design method of frequency domain window-adding is the main method. Four classical window-adding filters were designed,which are RL filter,SL filter,Hamming window filter and exponent window filter. The four filters’characteristics were analyzed using the unit impulse response and frequency response. The four filters were compared from the frequency response side and the sidelobe attenuation rate side. Theoretical analysis and simulation results show that the vibration noise of the exponent window filter is minimum and the SL filter is optimal as a whole.