STRUCTURE DISPLACEMENT MEASURING METHOD

摘要

PROBLEM TO BE SOLVED: To provide a structure displacement measuring method capable of a dynamic measurement as well as a completely contactless measurement of a minute displacement equal to or less than 1 mm from a distant position even for an image type measuring method and capable of estimating a measurement accuracy.

SOLUTION: The structure displacement measuring method includes the steps: to perform a dynamic photographing; to compare a measured image with a reference image; to calculate an amount of pixel displacement; and to calculate a displacement by converting a measured displacement represented in the number of pixel into a displacement in a unit of a real scale based on a photographing distance and a photographing angle and to calculate a measurement error as well. Depending on a site condition causing a large measurement error, the method changes a photographing condition. In order to reduce the effect of an atmospheric distortion, the method adapts a limitation in the photographing distance and allows a measurement to be performed by a night photographing. Also in the presence of the atmospheric distortion in measurement data, the method can reduce the effect thereof by filter processing.

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