A NEW ALGORITHM FOR HIGH DENSITY IMPULSE NOISE REDUCTION USING UNSYMMETRIC TRIMMED MEDIAN FILTER
Yekkitilli Sruthi, Ch. Rambabu · 2012
The filter, Direction index based unsymmetric trimmed median (DIBUTM) filter consists of two steps. In the first step, the detection of impulse corrupted pixels is done based on direction index method. In the second step, the corrupted pixels that are detected using the direction index are filtered using unsymmetric trimmed median filter. It is a technique in which only the noisy pixels are replaced using the concept of trimming, a method in which the noisy pixel values are removed from the selected window to recover the original value of the processing pixel value. The proposed algorithm offers better value of Mean square error (MSE) and Peak signal to noise Ratio (PSNR) compared to other filters like standard median, Center weighted median (CWM) and Pixel wise median of absolute deviations from the median (PWMAD) filters.