强激光与粒子束, 2015, 27 (8): 084006, 网络出版: 2015-08-25
基于改进开关中值滤波的多孔网栅图像脉冲噪声消除
Removal of impulse noise of anti-scatter grided images with modified switching median filters
摘要
针对多孔网栅闪光照相图像含有随机脉冲噪声的问题,提出了一种改进的开关中值滤波噪声消除算法.该算法利用像素与邻域窗口统计中值的灰度信息,建立噪声点探测器.通过设置噪声点探测阈值来识别噪声,并用邻域窗口内统计中值代替噪声点取值.经过多次滤波,含随机脉冲噪声的计算机合成网栅图像及实验网栅图像可获得良好的恢复效果.
Abstract
For the images obtained by the flash radiography with an anti-scatter grid,impulse noises exist and need to be removed before further image processing.An improved switching median filter method is proposed in this paper for the task.In the method,the grayscales of a pixel and the median of its neiborhoods are utilized together to construct an impulse-noise-judger.If the value of the impulse-noise-judger is larger than a predefined threshold,the pixel is regarded as noise,and is replaced by the median.By implementting this operation on an initial image repeatedly,each with the same threshold,one can get satisfying result of impulse noise suppression.This is testified for simulated and real experiment images.The proposed method is superior to the standard median filter method in that it retains the original details of the images better.
景越峰, 管永红, 刘军. 基于改进开关中值滤波的多孔网栅图像脉冲噪声消除[J]. 强激光与粒子束, 2015, 27(8): 084006. Jing Yuefeng, Guan Yonghong, Liu Jun. Removal of impulse noise of anti-scatter grided images with modified switching median filters[J]. High Power Laser and Particle Beams, 2015, 27(8): 084006.