quotREMOVAL OF HIGH DENSITY SALT AND PEPPER NOISE THROUGH MODIFIED CASCADED FILTERquot
B. Karthik, E. Logashanmugam · Shodhganga · 2014
A modified cascaded filter for the restoration of gray scale and color images that are highly corrupted by salt and pepper noise is proposed in this paper. The proposed algorithm replaces the noisy pixel by trimmed median value when other pixel values, 0's and 255's are present in the selected window and when the entire pixel values are 0's and 255's then the noise pixel is replaced by mean value of all the elements present in the selected window. This modified cascaded filter shows better results than the Standard Median Filter (MF), Decision Based Algorithm (DBA), Modified Decision Based Algorithm (MDBA) and Progressive Switched Median Filter (PSMF). The modified cascaded filter is tested against different grayscale and color images and it gives better Peak Signal-to-Noise Ratio (PSNR) and Image Enhancement Factor (IEF).