| 摘要 |
PROBLEM TO BE SOLVED: To provide a displacement measuring device capable of accurately calculating displacement of a measuring point. SOLUTION: This displacement measuring device 1 calculates a displacement quantity of an optional measuring point 3a from an image before and after displacement of a plurality of measuring objects 10 photographed by an imaging element, and has an image processing part 13 processing the image photographed by the imaging element. The image processing part 13 has a reference point selecting means 24 for selecting optional one measuring point as a reference point 12 from a plurality of measuring points 3a of the image, and a displacement quantity calculating means 25 for calculating the displacement quantity of the respective measuring points 3a based on the reference point 12. The reference point selecting means 24 selects the reference point 12 from a variation in a coordinate value of the measuring point 3a of the image photographed first and a coordinate value of the optional measuring point 3a of the image photographed later, and sets such a measuring point 3a as the reference point 12 when determining that the variation in the coordinate value of the optional measuring point 3a is smaller than a predetermined quantity. COPYRIGHT: (C)2008,JPO&INPIT
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