1. A method for imaging a medium under evaluation, the method comprising: generating acquired images of the medium, each acquired image comprising a cross-sectional image of the medium along a lateral direction and a depth direction of the medium that results from scanning the medium at discrete depths; filtering each acquired image to remove out-of-focus portions of the images and to generate filtered images, wherein filtering comprises computing windows that can be applied to the acquired images to define the portions of the acquired images that will be removed; and merging the filtered images to form a high-resolution fused image.