| 摘要 |
PURPOSE:To rapidly prepare the road center line by forming a closed area while discriminating the road and the place other than road and preliminarily determining the road. CONSTITUTION:In a CPU10, a drawing reading part 1 reading the drawing from a map, a thinning line part 2 thinning a line until the read graphic becomes one picture element, a vector part 3, a closed area formation part 4 forming the area other than the road as the closed area, and a painting-out device 5 painting out the closed area formed by the closed area formation part 4 are respectively connected. In this case, the road and the place other than road are discriminated by closing area, and the extraction of the road center line is performed after determining the road in advance. Thus, the extraction omissions near an intersection and a branching point and extraction fault do not occur, and the center line of two-line road can be rapidly prepared. |
