1. A computer implemented method of rendering an image, the method comprising: accessing a first image represented in a space domain, said first image comprising a first section and a second section; applying a blur operator on said second section to generate a second image; identifying a plurality of target regions from said second section in said first image; converting said plurality of target regions from said space domain to a frequency domain by performing a convolution thereon; restoring said plurality of target regions in said first image from said frequency domain to said space domain to produce a third image; and blending said second image and said third image to produce a resultant image.