US Patent 7595797 Transforming a polygonized object into an implicit-function representation

An image processing method using a computer includes extracting vertex coordinates (S13) of a triangular-shaped polygon, setting a region (S14) surrounding the triangular-shaped polygon (TP) on the basis of the vertex coordinates, measuring a distance (S15) from a lattice point included in the region to the triangular-shaped polygon (TP), and drawing a graphic figure (S21). The graphic figure is drawn on the basis of the distance from the lattice point to the triangular-shaped polygon (TP).