Patent ID: 11867592
Assignee: NEC CORPORATION
Field: Measurement (Instruments)
Classification: CPC G  E | IPC G

Claim 5:
6. A structure displacement amount measurement method comprising:
measuring, by a processor and at each of a plurality of times over a period of time, a displacement amount generated on a measurement spot on a floor deck of a target bridge by a weight of a vehicle traveling on the target bridge, which is to be diagnosed, wherein the displacement amount is measured by analyzing time-series images of the measurement spot captured by a camera substantially immediately below the measurement spot;
estimating, by the processor and within the period of time, a section of time in which deflection of the target bridge occurred, based on the displacement amount measured at each of the plurality of times over the period of time;
detecting, by the processor, a number of maximal values and a number of minimal values of the displacement amount measured within the section of time;
in response to the number of maximal values being equal to one and the number of minimal values being equal to zero, corresponding, by the processor, the maximal value as the displacement caused by the weight of only the vehicle; and
generating, by the processor, a histogram of the displacement amount caused by the weight of only the vehicle; and
performing, by the processor, deterioration diagnosis of the target bridge based on the generated histogram, and output a result of the deterioration diagnosis.