Abstract
To simultaneously balance the high accuracy of small displacement vibration measurement and the tracking robustness of large-scale rotational motion in structural dynamic testing, a tracking-detecting-deformable matching (TDDM) point tracking method is proposed in this paper. In this new method, the movement range of the target point is estimated through tracking, and then the drift and accumulated error of the tracker is corrected by real-time detecting. The tracking and detecting decision result is taken as the initial guess for matching, and the optimal local deformation correction is finally solved. The proposed method is first tested in the numerical experimental images with different interference terms to demonstrate its performance in challenging application scenarios. In addition, low amplitude vibration testing and large-scale rotational motion tracking cases are tested. The TDDM shows a much higher measurement accuracy and tracking success rate than the existing point-tracking-based vision measurement methods.
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