| 摘要 |
PROBLEM TO BE SOLVED: To provide a method in which the surface speed for avalanche of rocks and earth is corrected through camera as a method, in which a distance is calculated from a single-lens camera image, featured in such a way that the angle of elevation and a distance up to the surface of the avalanche of rocks and earth can be calculated from the geometrical relationship between a distance up to a certain quadrilateral and its image and is featured in such a way that the surface speed of the avalanche of rocks and earth can be calculated from the geometrical relationship between the single-lens camera image and the distance. SOLUTION: In this method, the surface speed of an avalanche of rocks and earth is corrected by a method, in which a distance is calculated on the basis of a single-lens camera image is calculated in which a fixed monitoring camera captures an image deformed due to the inclination of the surface of the avalanche of rocks and earth. The type of the monitoring camera and the type of a placed lens are known so that they can be input, the angle of elevation and a distance up to the surface of the avalanche of rocks and earth can be calculated on from of the geometrical relationship between a distance up to a certain quadrilateral and its image, and the distance is calculated the from the single-lens camera image, and the surface speed of the avalanche of rocks and earth is corrected through a camera. |
