Enhanced presentation methods for visualizing motion of physical structures and machinery
Embodiments described herein enhance the visualization of certain conditions contained in a video depicting motion in a field of view, in which the enhancements include but are not limited to one or more of: adjusting the appearance of video when objects are at different distances from a video acquisition device; aligning phase of motion obtained from different video acquisition devices; accentuating frequency phenomena that may be masked or obstructed in the presence of other frequencies of motion; differentiating motion data to obtain velocity or acceleration waveforms or spectra; applying a color scheme to pixels in a scene to highlight motion with specific characteristics or to amplify motion or provide indication of absolute motion; and determining spatial or temporal regions in the video to amplify based on the predetermined parameters.
1. A motion evaluation method for evaluating motion of an object using a plurality of video acquisition devices, wherein an output of at least one of said video acquisition devices comprises recorded video of the object as video files divisible into individual image frames, with each frame providing a static image of the object in a scene, and with each frame being divisible into a plurality of pixels, comprising:
obtaining a first video of the object located in the scene using a first video acquisition device, wherein each video generates a signal indicative of an intensity of at least one pixel contained in at least one frame, wherein the intensity of the at least one pixel varies with the motion of the object;
obtaining a second video of the object using a second video acquisition device;
selecting a first location on the object and obtaining a position of the first location relative to the second video acquisition device, and selecting at least a second location on the object and obtaining a position of at least the second location relative to the second video acquisition device;
determining distance information from the second video acquisition device to each selected location on the object and calculating a difference in distance between at least the position of the first selected location on the object and the position of the second selected location on the object based on said distance information;
receiving by the first video acquisition device at least one of the distance information determined by the second video acquisition device or the calculated difference in distance between the first selected location on the object and the second selected location on the object; and
modifying the first video obtained with the first video acquisition device by adjusting for the difference in distance between the first selected location on the object and the second selected location on the object.
2. The motion evaluation method of claim 1 , wherein the first video acquisition device comprises a first video camera and the second video acquisition device comprises a second video camera.
3. The motion evaluation method of claim 1 , wherein the first video acquisition device comprises a video camera and the second video acquisition device comprises a 3-D camera.
4. The motion evaluation method of claim 1 , further comprising configuring a monitor to display the modified first video.
5. The motion evaluation method of claim 1 , further comprising measuring an amplitude of the motion of the object, wherein the amplitude is proportional to a difference in intensity of at least one pixel contained in a first frame and the intensity of at least one pixel in a second frame.
6. The motion evaluation method of claim 5 , further comprising modifying video obtained with one or both of the video acquisition devices so motion of the object begins at a point of maximum amplitude in the scene.
7. The motion evaluation method of claim 5 , further comprising modifying video obtained with one or both of the video acquisition devices so motion of the object begins at a point of minimum amplitude in the scene.
8. The motion evaluation method of claim 5 , further comprising creating a waveform as a representation of the motion of the object.
9. The motion evaluation method of claim 5 , further comprising visually amplifying the motion of the object depicted in the first video by modifying at least one frame of the first video by multiplying an amplitude in at least one pixel by an amplification factor.
10. The motion evaluation method of claim 9 , further comprising overlaying at least one color scheme on the object whose motion is amplified.