Estimating Body Movements from Video: How Movement Size Affects Accuracy
Author Information
Author(s): Atesh Koul, Giacomo Novembre
Primary Institution: Neuroscience of Perception and Action Lab, Italian Institute of Technology (IIT)
Hypothesis
The accuracy of video-based motion tracking (OpenPose) depends on the amplitude of the movements being recorded.
Conclusion
OpenPose accuracy is moderate overall and improves significantly with larger movement amplitudes.
Supporting Evidence
- OpenPose accuracy improves with larger movement amplitudes.
- Accuracy is weak for low-amplitude movements and strong for movements greater than 10 cm.
- The relationship between accuracy and movement amplitude is non-linear.
Takeaway
This study shows that if you want to track how people move using video, bigger movements are easier to capture accurately than smaller ones.
Methodology
The study analyzed a dataset of 46 participants performing spontaneous movements, comparing OpenPose estimates to Vicon motion capture data.
Limitations
The study focused only on spontaneous movements and did not explore all possible movement parameters that could affect accuracy.
Participant Demographics
46 participants (26 female; mean age 21.43 years, range 18–30 years)
Statistical Information
P-Value
p<0.001
Statistical Significance
p<0.001
Digital Object Identifier (DOI)
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