公开(公告)号：US10861164B1

公开(公告)日：2020-12-08

申请号：US16367594

申请日：2019-03-28

Applicant: Amazon Technologies, Inc.

Inventor： Pragyana K. Mishra ,  Kevin Kuang-Hui Tseng

IPC: G06T7/20 ,  G01H9/00 ,  B64C39/02 ,  G06T7/50

Abstract: Natural frequencies of vibration of objects, such as aerial vehicles, are identified based on imaging data captured while the objects are subjected to excitation. The imaging data is captured using high-speed cameras, and changes in intensities of pixels corresponding to surfaces of the object are used to determine a spectral diagram of the vibrations from which natural frequencies of vibration (e.g., vibration modes) are determined. The visibility of the vibrating objects is enhanced by providing video images to band-pass filters within small bands around the natural frequencies, and magnifying the vibration based on the amplitudes or phases determined from each of the video images. A stream of the modified video images may be used to determine a mode shape corresponding to the vibration of the objects at or around a natural frequency of vibration.