| 摘要 |
PROBLEM TO BE SOLVED: To provide a speed measuring method capable of precisely measuring speed of a transparent body without providing a mark.SOLUTION: A line sensor disposed in parallel to the direction of movement of a transparent body scans the transparent body at a constant scan period. An angle between a line and a long side is derived that is generated in images that are obtained as a result of scanning the transparent body by the line sensor and arranged such that each of the long sides adjoin in a chronological order. In addition, speed of the transparent body is measured based on the angle, a scan period, length of the image obtained as a result of scanning by the line sensor corresponding to one pixel.SELECTED DRAWING: Figure 8 |
