comparing several denoising methods of salt and pepper noise such as median filter, harmonic filter, morphological filter and uating PSNR and MSE and presenting a new method with the best result at the presence of up to 70 salt and pepper noise-comparing several denoising methods of salt and pepper noise such as median filter, harmonic filter, morphological filter and　uating PSNR and MSE and presenting a new method with the best result at the presence of up to 70　salt and pepper noise