Thin-line detection apparatus and method

An apparatus for detecting and processing thin lines in a raster image, the apparatus comprising:

• a load module to read depth values for each pixel of an n×m block of pixels surrounding a central pixel, wherein both n and m are greater than or equal to 3;
• a calculation module to calculate the differences between selected depth values of the n×m block of pixels to yield a plurality of difference values;
• a comparator module to compare the plurality of difference values with a plurality of pre-computed difference value set, each difference value set associated with a thin line pre-determined to pass through the n×m block of pixels;
• and
• a preclusion module to preclude application of an anti-aliasing filter to the central pixel in the event the plurality of difference values matches a difference value set of the plurality of pre-computed difference value set.

An apparatus for detecting and processing thin lines in a raster image, the apparatus comprising:

• means for reading depth values for each pixel of an n×m block of pixels surrounding a central pixel, wherein both n and m are greater than or equal to 3;
• means for calculating the differences between selected depth values of the n×m block of pixels to yield a plurality of difference values;
• means for comparing the plurality of difference values with a plurality of pre-computed difference value sets, each pre-computed difference value set associated with different a thin line pre-determined to pass through the n×m block of pixels;
• and
• means for precluding application of an anti-aliasing filter to the central pixel in the event the plurality of difference values matches a pre-computed difference value set of the plurality of pre-computed difference value sets.