QUADRATURE PREFILTERING FOR HIGH-QUALITY ANTIALIASING

This article introduces quadrature prefiltering, an accurate, efficien t, and fairly simple algorithm for prefiltering polygons for scanline rendering. It renders very high quality images at reasonable cost, str ongly suppressing aliasing artifacts. For equivalent RMS error, quadra ture prefiltering is significantly faster than either uniform or jitte red supersampling. Quadrature prefiltering is simple to implement and space-efficient; it needs only a small two-dimensional lookup table, e ven when computing nonradially symmetric filter kernels. Previous algo rithms have required either three-dimensional tables or a restriction to radially symmetric filter kernels. Though only slightly more compli cated to implement than the widely used box prefiltering method, quadr ature prefiltering can generate images with much less visible aliasing artifacts.