基于2级噪声检测的改进中值滤波算法  

Improved median filtering algorithm based on two-stage noise detection

作　　者：王益艳[1] 王晅[1] 

机构地区：[1]陕西师范大学物理学与信息技术学院,陕西西安710062

出　　处：《计算机工程与设计》2008年第11期2841-2843,共3页Computer Engineering and Design

摘　　要：针对传统中值滤波算法去除高密度椒盐噪声能力的不足,提出了一种新的改进算法。该算法首先采用2级噪声检测方法对图像中的信号点和噪声点进行标识,然后对检测出的噪声点利用改进的中值滤波算法进行处理,而对信号点则保留其灰度值不变。实验结果表明,该算法能在有效去除噪声的同时很好地保留图像细节,相比于传统中值滤波及其它改进中值滤波算法,该算法获得的去噪后的图像具有更好的客观评价指标和主观视觉效果。To improve the performance of high salt and pepper noise reduction, a new improved filtering algorithm is proposed. First, a noise detection scheme which has two stages is adopted to identify the signal pixels and noise pixels. Second, the noise pixels are re- moved using the improved median filtering, while signal pixels hold their gray value and are left unprocessed. Simulation results show that the proposed algorithm can suppress noise very effectively and preserve image details very well, meanwhile, the restored images that are obtained by the proposed algorithm have better objective quality and subjective vision effect than that by the conventional median filter and other improved median filters.

关 键 词：椒盐噪声 噪声检测 噪声密度 中值滤波 边界扩展 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]