Depth-based antialiasing

摘要

An image processing apparatus is arranged to extract edge information, which is accurate enough to be utilized for anti-aliasing without rendering pixels other than the originally necessary drawn pixels and without inducing a drop in the drawing speed. The apparatus includes an anti-aliasing system for restoring edge information for an x-direction and a y-direction in screen coordinates from an image after drawing. The apparatus determines a processing content necessary for the anti-aliasing from the obtained edge information and scans either the information of a z-buffer and the information of a normal vector at each pixel obtained at the time of drawing, or both information, or by using the information of normal vectors restored from the information of the z-buffer. Accordingly, the anti-aliasing can be applied to each pixel.