| 摘要 |
PROBLEM TO BE SOLVED: To find the displacement of even an inaccessible object by picking up an image of the object to be measured including each reference point of measurement from a plurality of positions to obtain a plurality of photographic images, and respectively calculating the three-dimensional coordinates of an arbitrary point of measurement of the displacement based on the coordinates of the reference point of measurement on the photographic images before and after the displacement. SOLUTION: The displacement on a rock bed, etc., is measured by respectively calculating the three-dimensional coordinates of an arbitrary point of measurement of the displacement, based on the coordinates of reference points of measurement on the photographic images before and after the displacement. The reference points of measurement are required to be photographed from a plurality of positions. Calculation of the three-dimensional coordinates of the points of measurement of displacement comprises the measurement of the coordinates of the photographic images, i.e., the measurement of the coordinates of the required reference points of measurement on an object on the photographic images and the approximate analysis of the photographic images, i.e., three stages of acquisition of the accurate approximate values on the three-dimensional coordinates of photographic evaluation elements and the reference points of measurement, calculation of the three-dimensional coordinates of the evaluation elements and the reference points of measurement through the precise analysis of the photographic images, and calculation of the three-dimensional coordinates of an arbitrarily necessary point of measurement of displacement. |
