Monitoring of objects based on frequency spectrum of motion and frequency filtering
Present embodiments include but are not limited to a video camera which is able to capture and record video data of an entire machine without contacting the machine, to visually study complex motions which vary both in time and spatially at different locations on the machine, wherein filters applied to the motion present in the video recording are used to identify frequencies of importance and to visualize their impact on the operation of the machine, including by removing certain frequencies of lesser interest from the video recording.
1. A method for monitoring a machine, comprising:
obtaining a video recording comprising a plurality of video frames of the machine in motion;
constructing one or more temporally changing filters associated with motion of some object in the video; and in response to user input, dynamically applying the one or more filters to isolate, amplify,
or remove apparent motion in the video recording occurring in a user-selected region of interest, at the at least one selected frequency or the at least one selected frequency range which varies with the operation of the machine, thereby producing one or more new video outputs which create a visual presentation of a subset of the motion of the machine in the video recording.
2. The method of claim 1 , further comprising applying a tracking filter to the video recording based on an external signal that measures a frequency of interest.
3. The method of claim 2 , wherein the frequency of interest is a turning speed of the machine.
4. The method of claim 1 , further comprising measuring a frequency of motion for the machine or a component of the machine in the video from a time waveform and a frequency spectrum obtained from at least one motion measured from an external sensor positioned at a location of the machine.