Improving Deep Metric Learning With Virtual Classes and Examples Mining

Monitoring mechanical properties of structures such as bridges, buildings or wind turbines is important to detect early stage failures. Operational modal analysis is a testing method to estimate these properties from vibration measurements. Taking advantage of works on motion estimation, several video modal analysis methods have emerged in the last decade. This paper compares two strategies about sub-pixel phase-based motion estimations thanks to multi-scale decomposition. Synthetic videos of a vibrating cantilever beam are generated to assess the robustness of these methods against motion amplitude, gray scale quantization, white noise, and blurring.