|  Before registration, checkered comparison |  Before registration, transparant comparison | 
|  After registration, checkered comparison |  After registration, transparant comparison | 
|  Original Lenna |  Lenna + Gaussian noise (sigma = 20) |  Noisy image after filtering (NL Means) | 
|  Comparing original image and filtered image using SSD |  Comparing original image and filtered image using SSIM |