An Effective Filter Algorithm of Impulse Noise Image Denoising
Long Ma · Journal of Shenyang Jianzhu University · 2012
The paper is devoted to put forward an effective algorithm of image with impulse noise denoising by improving the traditional median filter.The following approaches are developed in this paper.First,in a small area all pixels are separated into signal pixels and suspicious noise pixels making use of the median filtering algorithm based on extremum and median value.Then suspicious noise pixels are further identified as the signal pixels and noise pixels around pixels.If a pixel value is a noise pixel,it will be processed by median filter.A signal pixel will retain the original pixel value.The numerical experiments show that compared with traditional median filter,the details and edge information of the original image are retained when the new algorithm is used.Compared with extremum median filter algorithm,the ratio of peak signal to the noise can increase up to 2.94 at most.As a result,it is an effective algorithm for image denoising that can eliminate impulse noise in the image effectively.