Image Restoration

Order statistics filter such as min,max,midpoint ,median,alpha-trimmed (spatial domain filters) has been used for restoration purpose.

PSNR (Peak signal to Noise ratio) is used as criteria (subjective fidelity criteria) in order to determine the how much the image is restored relative to original image.

PSNR

Original Image

Noisy Image(salt and pepper noise)

Median filter

Max filter

Min filter

Midpoint filter

Alpha trimmed filter

Median filter vs ALpha-trimmed filter

Comparison of restored images(Median filter vs Alpha-trimmed filter)

Clearly Median filter is the winner since it has far better SNR results than other filters