QUALITY ENHANCEMENTS OF DIGITAL OUTLINE FONTS

Digital fonts are easily available today and their use has become wide spread. Nevertheless, the visual quality of printed and displayed text and the technical quality of digital typefaces are often unsatisfacto ry. The foremost reason for this situation is that font manufacturing systems manipulate font representations through low-level operations. In this paper we examine several aspects of font quality, and present a method for enhancing the quality of a typeface given in today's stan dard representation, the outline (boundary) representation. The method is based on the usage of high-level typographic features, and include s enhancements to both individual glyphs and complete fonts. Glyph enh ancements include elimination of redundant points, insertion of essent ial points, corrections to contour orientations and inter-penetrations , and vertical and horizontal coherence. Font enhancements include reg ularization of font weights and sizes, serif unification, and feature extraction and discrimination. Our method is comprised of several algo rithms that have been implemented in a commercial font manufacturing s ystem, achieving enhanced quality of the fonts produced. (C) 1997 Else vier Science Ltd. All rights reserved.