Antialiasing of curves by discrete pre-filtering

Pre-filtering is generally considered the ideal approach to antialiasing but is difficult to perform exactly for complex geometries such as curves or for arbitrary choice of filters. We present a discrete pre-filtering technique for anti-aliasing Bzier curves using arbitrary filters which is numerically and geometrically robust and whose accuracy is controllable. CR Categories and Subject Descriptors: I.3.3 Computer Graphics: Picture/Image Generation --- antialiasing Additional Keywords: Bzier curves, pre-filtering 1 INTRODUCTION The causes of aliasing in computer generated imagery are well known and may be broken down into two components: aliasing due to inadequate sampling of the ideal image and aliasing due to incorrect or inadequate reconstruction of the displayed image from the samples. Many techniques have been proposed but there is no ideal or universal solution and compromises have to be made. As Mitchell and Netravali 29 point out, graphics has generally avoided the is...