THIN-LINE DETECTION APPARATUS AND METHOD

An apparatus and method for detecting and handling thin lines in a raster image includes reading depth values for each pixel of an n×m block of pixels surrounding a substantially central pixel. Differences are then calculated for selected depth values of the n×m block of pixels to yield multiple difference values. These difference values may then be compared with multiple pre-computed difference values associated with thin lines pre-determined to pass through the n×m block of pixels. If the difference values of the pixel block substantially match the difference values of one of the pre-determined thin lines, the pixel block may be deemed to describe a thin line. The apparatus and method may preclude application of an anti-aliasing filter to the substantially central pixel of the pixel block in the event it describes a thin line.