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 motion of physical structures, mechanical components, work pieces, parts, or products in a production environment collectively referred to as objects, comprising:
obtaining a video recording comprising a plurality of video frames of the objects in motion, wherein motion depicted in the video recording comprises movements of two or more of the objects undergoing periodic motion and wherein said movements occur at a plurality of frequencies;
obtaining from the video recording a frequency spectrum of the plurality of frequencies;
selecting at least one frequency or at least one frequency range depicted in the frequency spectrum which is associated with motion in the video recording occurring at the at least one frequency or the at least one frequency range;
constructing one or more filters associated with the at least one frequency or the at least one frequency range;
applying the one or more filters to one or more pixels in a field of view in one or more frames of the video recording to remove, isolate, or amplify motion in the video recording occurring at the at least one frequency or the at least one frequency range selected, thereby producing one or more new video outputs which create a visual presentation of a subset of the motion of the objects in the video recording.
2. The method of claim 1 , wherein the objects comprise motors, actuators, pumps, linkages, blowers, fans, pipes, ducts, gears, wings, control surfaces, rods, struts, conveyors, produced goods being mechanically moved in a production environment, and physical structures subject to dynamic changes in motion.
3. The method of claim 1 , further comprising obtaining a time waveform wherein the frequency spectrum is obtained from motion present in a selected region of interest in the field of view and wherein the step of applying one or more filters is performed on every pixel in a field of view that includes the selected region of interest, thereby removing at least one of unwanted frequencies and apparent motion from the one or more new video outputs.
4. The method of claim 3 , further comprising attaching one or more targets to the monitored objects to identify one or more regions of interest in the field of view which the computer readable program instructions automatically locate in the video recording.
5. The method of claim 1 , further comprising configuring computer readable program instructions to automatically establish a set of filters to apply based on a filter selection criteria comprising one or more of a list of largest peaks in the frequency spectrum, a list of harmonic families present in the frequency spectrum, and a list of sideband families present in the frequency spectrum.
6. The method of claim 1 , wherein applying one or more filters comprises selecting at least two noncontiguous frequencies, and further comprising producing one or more new video outputs which create a visual presentation of a subset of the motion of the monitored objects such that the at least two noncontiguous frequencies are present in the one or more new video outputs.
7. The method of claim 1 , wherein the frequency spectrum of motion is obtained from the video recording by selecting a location from at least one of the plurality of frames of the video recording.
8. The method of claim 1 , wherein the frequency spectrum is color coded to show what frequencies are to be filtered out and which frequencies will remain in motion in the new video outputs.
9. The method of claim 1 , further comprising configuring a cursor to be positioned on a frequency within the frequency spectrum to indicate a filter to apply.
10. The method of claim 1 , further comprising applying at least one filter based on at least one peak in the frequency spectrum and creating a video for said at least one peak.
11. The method of claim 1 , further comprising setting a threshold wherein one or more new video outputs includes motion represented by at least one peak above said threshold.
12. The method of claim 11 , wherein a user sets the threshold by positioning a moveable horizontal line such that motions represented by frequencies with peaks above said line are included in said one or more new video outputs and motions represented by frequencies with peaks below said line are not included in said one or more new video outputs.
13. A method for monitoring motion of physical structures, mechanical components, work pieces, parts, or products in a production environment collectively referred to as objects, comprising:
obtaining a video recording comprising a plurality of video frames of the objects in motion; obtaining from the video recording a frequency spectrum of motion as depicted by a change in an intensity of one or more pixel locations present in the video recording;
selecting at least one frequency or at least one frequency range depicted in the frequency spectrum;
constructing one or more filters associated with the at least one frequency or the at least one frequency range; and
applying one or more filters to isolate, amplify, or remove apparent motion in the video recording occurring at the at least one frequency or the at least one frequency range selected, thereby producing one or more new video outputs which create a visual presentation of a subset of the motion of the monitored objects in the video recording.
14. The method of claim 13 , wherein the objects comprise motors, actuators, pumps, linkages, blowers, fans, pipes, ducts, gears, wings, control surfaces, rods, struts, conveyors, produced goods being mechanically moved in a production environment, and physical structures subject to dynamic changes in motion.
15. The method of claim 13 , further comprising obtaining a time waveform resulting from the change of the intensity in one or more pixel locations present in a selected region of interest in a field of view in one or more frames of the video recording from which the frequency spectrum is obtained, and wherein the step of applying one or more filters is performed on every pixel in the field of view or a portion of the field of view comprising a subset of pixel locations in the field of view, thereby removing at least one of unwanted frequencies and apparent motion from the one or more new video outputs.
16. The method of claim 15 , further comprising attaching one or more targets to the monitored objects to identify one or more regions of interest in the field of view which computer readable program instructions automatically locate in the video recording.
17. The method of claim 13 , further comprising configuring computer readable program instructions to respond to a user applying filters and a user selection of one or more regions of interest in a field of view from one frame of the video recording to establish a spatial region from which the computer readable program instructions will produce the frequency spectrum.
18. The method of claim 13 , further comprising configuring computer readable program instructions to automatically establish a set of filters to apply based on a filter selection criteria comprising one or more of a list of largest peaks in the frequency spectrum, a list of harmonic families present in the frequency spectrum, and a list of sideband families present in the frequency spectrum.
19. A filtering method for removing unwanted frequencies or apparent motion from a video recording obtained and used for monitoring motion of physical structures, mechanical components, work pieces, parts, or products in a production environment collectively referred to as objects, comprising:
obtaining a video recording comprising a plurality of video frames of the objects in motion, wherein the video recording includes a selectable region of interest and wherein motion depicted in the video recording comprises movements of two or more of the objects undergoing periodic motion and said movements occur at a plurality of frequencies;
obtaining from the video recording a frequency spectrum of the plurality of frequencies;
selecting frequencies or frequency ranges depicted in the frequency spectrum which are associated with motion in the video recording occurring at said selected frequencies or frequency ranges, wherein at least two of the selected frequencies or frequency ranges are non-contiguous;
constructing one or more filters associated with at least one of the selected frequencies or frequency ranges;
applying the one or more filters to remove unwanted frequencies or apparent motion in the video recording associated with at least one of the selected frequencies or frequency ranges; and
producing one or more new video outputs which create a visual presentation of a subset of the motion in a field of view in one or more frames of the video recording such that the at least two noncontiguous frequencies are present in the one or more new video outputs, and wherein the one or more new video outputs are characterized by removal of at least one of unwanted frequencies and apparent motion.
20. The method of claim 19 , wherein the objects comprise motors, actuators, pumps, linkages, blowers, fans, pipes, ducts, gears, wings, control surfaces, rods, struts, conveyors, produced goods being mechanically moved in a production environment, and physical structures subject to dynamic changes in motion.
21. The method of claim 19 , further comprising obtaining a time waveform, wherein for a selected region of interest, the frequency spectrum is obtained from motion present in the selected region of interest in the field of view.
22. The method of claim 19 , further comprising configuring computer readable program instructions to respond to a user applying filters and a user selection of one or more regions of interest in the field of view from one frame of the video recording to establish a spatial region from which the program instructions will produce the frequency spectrum.
23. The method of claim 19 , further comprising configuring computer readable program instructions to automatically establish a set of filters to apply based on a filter selection criteria comprising one or more of a list of largest peaks in the frequency spectrum, a list of harmonic families present in the frequency spectrum, and a list of sideband families present in the frequency spectrum.
24. The method of claim 19 , wherein the frequency spectrum is color coded to show what frequencies are to be removed and which frequencies will remain in motion in the new video outputs.
25. The method of claim 19 , wherein the motion in the filtered videos is amplified or a playback speed is altered to improve visualization.