In order to identify small vibrations of the bridge structure,a target center detection algorithm based on orientation code matching(OCM)method is proposed.The algorithm first uses the OCM method to achieve pixel-level matching,and then uses the target center detection algorithm for accurate tracking in the best matching area.Through laboratory experiments,the OCM-based target center detection algorithm is com-pared with the phase-based optical flow method and the OCM sub-pixel implementation algorithm,and the ap-plicability of the three algorithms in different vibration amplitudes and practical engineering applications is ex-plored,which provides a technical scheme comparison basis for real bridge detection.The results show that the proposed algorithm can accurately identify the structural vibration displacement and frequency under various vi-bration amplitudes,and the feasibility of target sticking should be considered in the application of real bridge.The phase-based optical flow method can accurately identify the vibration displacement and frequency of the structure under small vibration cases with amplitude index less than 2 mm or 1.7 pixels.The resolution accura-cy of the OCM sub-pixel implementation algorithm depends on the number of interpolation points,and has a similar effect to the proposed algorithm under large amplitude vibration cases.
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