Patent ID: 11972577
Assignee: RDI TECHNOLOGIES, INC.
Field: Computer technology (Electrical engineering)
Classification: CPC G | IPC G

Claim 0:
1. A method for detecting and displaying aliased peak frequencies in a video recording acquired of an object in motion, comprising:
acquiring and storing a set of images with a video acquisition device depicting a structure, machine, or machine component in a field of view, wherein the set of images comprises a plurality of video frames comprising individual pixels organized spatially as an X-Y grid;
generating a waveform of motion of the structure, machine, or machine component in a region of interest (ROI) on at least one of the plurality of video frames;
transforming the waveform into a first frequency spectrum for the ROI comprising a first set of frequencies;
obtaining a second set of frequencies associated with motion specific to the machine, structure, or machine component from measurements made with one or more accelerometers;
determining a presence of an aliased frequency in the first frequency spectrum by calculating aliased frequency values from the second set of frequencies, and comparing the calculated aliased frequency values to one or more peaks in the first frequency spectrum to determine if the aliased frequency is present among the one or more peaks; and
if an aliased frequency is present in the first frequency spectrum, generating a reconstructed frequency spectrum presenting the aliased frequency in a true frequency location or identifies at least one aliased peak in the first frequency spectrum and provides a true frequency for the at least one aliased peak.