![]() 5 Hersch, R.D., "Descriptive Contour Fill of Partly Degenerated Shapes," IEEE Computer Graphics and Applications, Vol 6, No 7, July 1986.4 Knuth, D., Tex and Metafont, American Mathematical Society, Digital Press, 1979 Google Scholar.3 Karow, P., "Elektronische Modifikation grafischer und verbalgrafischer Zeichen," Deutscher Drucker, Nr.2 Adobe Systems Inc, Postscript Language Reference Manual, Addison-Wesley, 1985 Google Scholar Digital Library. ![]() 1 Coueignoux, P.,"Character Generation by Computer," Computer Graphics and Image Processing, Vot 16, pp 240-269, 1981 Google Scholar Cross Ref.It is also suitable for character rasterization in typographic computer-aided design systems. Hence, this method is very well adapted for direct character generation on non-impact printers. The processing time used to apply grid constraints is negligible, compared with the time needed for character scan-conversion and filling. The resulting character description therefore remains nearly identical to the original description. The type of constraints applied to parts of a character consists only of horizontal or vertical subpixel translations. Grid constraints are also applied to avoid discrete arcs with an isolated pixel or a long horizontal or vertical run. So that several contraints may be applied, degrees of freedom are provided in the form of stretchable null-segments inserted at particular locations in the character outline description. Grid constraints are applied in order to force given parts of a character (stems, serifs) to attain identical phasing. Identical parts of a character lying at a different phase in respect to the grid will have a dissimilar discrete look. An original and fast filling algorithm based on vertical scan line sweep and contour tracking of a presorted shape description allows filling of character shapes with real subpixel resolution.
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