基于IRFPA改进中值滤波算法的FPGA实现  

FPGA Implementation for Improved Median Filtering Algorithm Based on IRFPA

作　　者：杨绍岩[1] 刘万成[1] 周长春 

机构地区：[1]光电信息控制和安全技术重点实验室,河北三河065201 [2]北京电子专科学院,北京100190

出　　处：《光电技术应用》2011年第2期64-67,70,共5页Electro-Optic Technology Application

摘　　要：中值滤波是基于排序统计理论的一种能有效抑制噪声的非线性信号处理技术。改进中值滤波算法与传统3×3中值滤波器相比较:滤波模板由2个FIFO与7个寄存器组成,简单实用;经过6级比较可以快速找到9个数的中值,提高了寻找中值的速度;得到的中值与原始数据经过阈值比较,做选择性替换,便于更好地保持图像细节。此算法在640×512元红外焦平面阵列探测器上,成功实现3×3窗口对图像进行中值滤波,运算简单速度快,在滤除噪声尤其是脉冲噪声的同时能很好地保护信号的细节信息。The median filtering is a nonlinear signal processing technology based on the order statistical theory,it can effectively suppress the noise.The improved median filtering algorithm and the traditional 3×3 median filter are compared： the filtering mould board is composed of 2 FIFOs and 7 registers,simple and practical;by using 6-level comparison,9 medians are found fast,which can improve the speed of finding median;in order to keep the image details,the obtained median and the original data are compared with the threshold to selectively replace.Using the algorithm,3×3 window successfully achieves the median filtering of the image on the 640× 512 element infrared focal plane array（IRFPA）.This algorithm is simple and fast,it can protect the signal details well at the same time of filtering the noise,especially the pulse noise.

关 键 词：红外焦平面阵列 中值滤波 模板 阈值 

分 类 号：TP391[自动化与计算机技术—计算机应用技术] TN713[自动化与计算机技术—计算机科学与技术]