Image Transmission over Multipath Fading Channel and Image Denoising using Directional Weighted Median Filter
Veeramma Yatnalli, K. Lakshmi Sudha · International Journal of Computer Applications · 2015
Impulse noise is often introduced into images during transmission contaminating the images due to channel errors.Based on the noise values, impulse noise can be classified as Fixed Valued Impulsive Noise or Salt and Pepper Noise(SPN) and Random Valued Impulsive Noise(RVIN).In this paper, an inpainting algorithm is presented based on Directional Weighted Median(DWM) Filter to denoise both the noises caused due to image transmission over multipath fading channel.The algorithm diffuses median value of pixels from the exterior area into the inner area and thus preserves the edges and fine details.The random valued impulsive noise and salt and pepper noise due to wireless channel modeled are simulated using MATLAB channel objects.The detection algorithm combined with the image correction based on DWMF shows better performance in terms of Peak Signal-to-Noise Ratio(PSNR) and Mean Absolute Error(MAE).