Camera shooting measurement error suppression method by arranging near-field fixed points

Abstract

The invention provides a method for suppressing a camera shooting measurement error by arranging a near-field fixed point, which comprises the following steps of: (1) installing a marker, erecting a digital camera and arranging a near-field fixed reference point; (2) simultaneously monitoring a far-field structure mark and a near-field reference mark through a digital camera; (3) calibrating a digital camera; (4) acquiring pixel coordinates of the far-field structure mark and the near-field reference mark; (5) acquiring the displacement variation in the pixel coordinate system; (6) repeating the processing of the step (5) on a subsequent image sequence; (7) designing an adaptive filter, and eliminating measurement errors; and (8) obtaining the real displacement of the to-be-measured structure. According to the invention, the defect that a far-field fixed reference point is difficult to arrange and find in camera shooting measurement so as to suppress errors is overcome, and the requirements on a measurement angle and a view field in an actual environment are flexibly met; besides, an adaptive filtering technology is introduced, so that displacement measurement is more accurate.

Description

technical field [0001] The invention relates to the technical field of camera measurement, in particular to a camera measurement error suppression method by arranging near-field fixed points. Background technique [0002] With the development and progress of technologies such as computer vision and image sensors, camera measurement methods with the characteristics of non-contact, long-distance, and high precision have gradually become one of the research hotspots in the field of structural health monitoring. Usually, due to the external environment, measuring instruments and other factors, the measurement results of structural displacement will produce large errors. In order to suppress the impact of measurement errors on measurement accuracy, some people adopt the method of arranging fixed reference points near the structure to be measured or using distant buildings as fixed reference points. This method is more comprehensive than the method of establishing a correlation m...

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Problems solved by technology

[0003] For example, a "fixed point-based remote in-plane small displacement absolute detection device and method" disclosed in Chinese patent literature, its announcement number CN106482648A, includes a first signboard, a second signboard, and a camera. Collecting the projection of the signboard to detect the movement, which has great requirements for the layout of the reference point, limits the scope of the structure to be tested, has low versatility, and cannot automatically adjust the measurement parameters. The accuracy is low and the measurement error is large.

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