| 摘要 |
<P>PROBLEM TO BE SOLVED: To solve the problem, wherein a control point and the installation position of a measureing camera move, due to blowing winds or ground deformation outdoors so that it deviates randomly from initial set value, resulting in measurement errors, and where it is also a cause of man-made error because installation and maintainance work including foundation construction are difficult, when there are a number of measurement points as the number of control points need to be increaed accordingly, in a method where image processing technology is used for measuring displacement, position, attitude and size of an object. <P>SOLUTION: An object or a natural object, recognized as a fixed point other than an object under test in a background image, is sorted and set up without having to install artificial control points, and a mesuring point and a control point are photographed simultaneously by using a line connecting a camera and a feature line of its image as a control line, to thereby offset the effects of fluctuation. A combination of a mirror, a half mirror and optical device, such as prism, is used to acquire background images in many directions. <P>COPYRIGHT: (C)2008,JPO&INPIT |
