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。
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.
出处
《强激光与粒子束》
EI
CAS
CSCD
北大核心
2015年第8期216-221,共6页
High Power Laser and Particle Beams
基金
中国工程物理研究院科学技术发展基金项目(2012A0202006
2013B0202021)
国家自然科学基金项目(11304295)
关键词
中值滤波
脉冲噪声
多孔网栅
median filter
impulse noise
anti-scatter grid
