A multi-stage algorithm of extracting joint points for generating function-fonts

An automatic function-font generating system for brush-written characters has been proposed. The system extracts sharp corners of boundary lines, (so-called joint points), and approximates the boundary lines between adjacent joint points using a piecewise polynomial. The quality of the generated function-fonts is controlled by the location of joint points. An attempt is made to develop an advanced function-font generating system with an algorithm to extract appropriate joint points. The algorithm consists of three stages: (1) extracting joint points by evaluating digital curvature, (2) extracting additional joint points by evaluating the curvature of approximated boundary line, and (3) removing the redundant joint points. The performance of the method is verified by applying it to brush-written characters, printed characters, and figures