On Method of Extracting Joint Points for Generating Function-Fonts of Multi-Symbols

In the previous research, the authors proposed a method to generate high quality function-fonts for brush-written characters automatically. This method extracts sharp edges of boundary lines, so-called joint points, and approximates the boundary line between each adjacent joint points using piecewise polynomials. As the next step, we applyed the previous method for printed characters and figures. We find that they have another rules of quality and that the previous method cannot be adopted to these fonts. This paper aims to make clear how joint points should be determined for many kinds of fonts and to present a multi-stage algorithm to extract them exactly. The per formance of the present method is verified by some experiments.