JPS6417092A - Approximation of character image - Google Patents

Abstract

PURPOSE: To prevent the occurrence of overshoot by detecting a place where overshoot is likely to occur, and calculating a curve defining vector based on a position obtained by changing the position of the surrounding sample point. CONSTITUTION: An evaluation value (ai) for detecting the place of the occurrence of overshoot from three sample points Pi-1 , Pi , and Pi+1 is calculated by an evaluation value calculating part, and this evaluation value (ai) is compared with an evaluation reference value (amax) set by an evaluation reference value setting part by an evaluation value comparing part. Then, when ai >= amax, a curve definition vector Q1 is calculated based on the three sample points Pi-1 , Pi , and Pi+1 , and when ai < amax, the curve defining vector Q1 is calculated based on a sample point Pi-1 ' obtained by changing the position of the sample Pi-1 and the sample points Pi and Pi+1 , or the curve defining vector Q1 is calculated based on a sample point Pi+1 obtained by changing the position of the sample point Pi+1 and the sample points Pi-1 and Pi . Then, the outline of a character picture is approximated by a curve expressed in an expression I. Thus, overshoot can be prevented.