| 摘要 |
PURPOSE:To obtain the straight line stroke of high reliability by correctly recognizing one segment subdivided into plural segments by crossing other segments as one straight line to extract it. CONSTITUTION:The segment U1 has a start point and an end point within a line width error range delta. Thus, the length of the segment U1 is neglected to define an end point T2 and an end point T3 to be the same point and the segment S2 is selected from the segments branching from the end point T2 or the end point T3 as the segment traced from the end point T3. Namely, from the end point T2, the segment S6 branches and from the end point T3, the segments S4 and S2 respectively are branched and distances h1-h3 are obtained from an integer operation and compared which is similar to that the opening between the segment S1 and the respective segments is compared by the use of angles alpha1-alpha3. Thereby, since h2=MIN (h1, h2, h3) is ratified, the segment S2 is selected. |
