1. A method for detecting and processing thin lines in a raster image, the method comprising: reading depth values for each pixel of an n×m block of pixels surrounding a substantially central pixel; calculating the difference between selected depth values of the n×m block of pixels to yield a plurality of difference values; comparing the plurality of difference values with a plurality of pre-computed difference values associated with a thin line pre-determined to pass through the n×m block of pixels; and precluding application of an anti-aliasing filter to the substantially central pixel in the event the plurality of difference values substantially matches the plurality of pre-computed difference values.