Jing Sun,Hui-gang Liu,Fu-hai Zhang.A new adaptive switching filter with directional impulse detection[J].Optoelectronics Letters,2014,10(2):157-160 A new adaptive switching filter with directional impulse detection Author Name Affiliation E-mail Jing Sun  College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China  bluestarco@sina.com  Hui-gang Liu  College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China    Fu-hai Zhang  College of Electronic Information and Optical Engineering, Nankai University, Tianjin, 300071, China    Abstract:       A novel adaptive switching filter (ASF) based on directional detection is proposed for denoising the images that are highly corrupted by impulse noise. The proposed algorithm employs an efficient noise detection mechanism. It first employs an efficient method to estimate the differences between the current pixel and its neighbors aligned with 28 directions. The current noise pixel is replaced by a median or a mean value within an adaptive filter window with respect to different noise densities. Experimental results show that the proposed approach can not only achieve very low miss-detection ratio and false-alarm ratio even up to high noise corruption, but also preserve the detailed information of an image very well. Hits: 3851 Download times: 0 This work has been supported by the Natural Science Foundation of Tianjin （No. 13JCQNJC01200）. View Full Text    Download reader