1. A method for image processing, comprising: selecting, at an image processor, a region of a first image comprising a plurality of pixels; computing, using the image processor, a mean value of pixels in the selected region; selecting, at the image processor, from a plurality of sets of pixels in the region, a first subset of pixels in the region containing artifacts therein; comparing, using the image processor, a value of each pixel in the first subset with the mean value; adjusting, using the image processor, the value of each pixel based upon the comparing; and reconstructing, at the image processor, the first image based upon the adjusted value of each pixel in the first subset, such that a variance of pixel values in the reconstructed image is lower than a variance of pixel values in the first image.