关键词: 中值滤波, 椒盐噪声, 自适应, 细节保护

Abstract: In order to improve the quality of underground images acquisition, according to the advantages and disadvantages of the current median filter algorithm, a new denoising algorithm is proposed which eliminates salt and pepper noise from underground images that are corrupted by salt and pepper noise. The new algorithm first adjusts noise points and non-noise points in image, then determines the size of filtering window adaptively on the basis of the number of noise points in window, and gives corresponding weight to each pixel points in the filtering window adaptively by certain rules, finally makes full use of weighted median filtering algorithm processing the noise points. Computer experimental results clearly show that the proposed algorithm outperforms many of the existing median filter algorithm in terms of effectively eliminating the noise and protecting image detail well.

Key words: median filter, salt and pepper noise, adaptive, detail preserving