微光图像中值滤波与众值滤波理论与实验研究

中值滤波法是图像平滑技术中常用的一种方法。但中值滤波法处理微光图像时有一定的局限性。该文对此做了进一步的实验与讨论，与众值滤波法进行了比较性研究。众值滤波法是对滤波窗口内所有像素点的灰度值作数学统计，并取出现几率最大的像素灰度值为为滤波结果，累此处理过的图像更接近真实。

Theory and Experiment Study on Low Light Level Image by Median Filter and Mode Filter

Median filter is a method commonly used in the technique of image smoothing.But when being used to process low light level images,median filter has a certain limitation,In this paper,further discusses and experiments are done. And comparative studios with mode fiIter are carried out.Mode filter is making the grey scale value statistics of allthe pixels inside the filtering window and taking the grey scale mode as the filtering result,therefore the processed image is closer to the original one,The experimental results showthat mode filter can suppress the sharp noise of low light level image effectively.And as forthe protection of the image edge,the property of mode filter is better than that of medianmter.