Algorithm for the Removal of Impulse Noise Based on Two-Stage Detection
Qizheng Liao · Beijing Youdian Xueyuan xuebao · 2005
A new algorithm of impulse noise removal is proposed based on the characters of image structure and noise. During noise detection a switching method which have two stages is adopted. The min-max operator is used first. Then further detection is conducted by using the information of structure around the pixel. The pixel is identified between noise and signal by a threshold. If it is a noise point, the value is replaced by rank-ordered mean (ROM) of the filter window during noise removal. Compared with other several algorithms, the proposed algorithm can protect details of image efficiently while removing fixed-valued impulse noise.