Markerless Infrared Motion Capture for Range of Evaluation
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Solution Overview
Problem
Current methods for evaluating range of motion, particularly in physical therapy and industrial rehabilitation, rely on subjective assessments and manual measurements, which are time-consuming and costly, and lack objective data on joint movement during functional tasks, leading to inefficiencies and potential injuries in manufacturing and healthcare settings.
Innovation Solution
A range of motion evaluation system utilizing markerless infrared-based depth mapping technology, combining a projector and camera to track multiple joints in three dimensions, providing real-time metrics on angular movements, velocity, and acceleration, and enabling automated data capture for ergonomic assessments and training.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual measurements with goniometer and visual inspection are used, then measurement precision can be achieved for single angle, but the evaluation process becomes time-consuming and subjective
Solution Approach 1:
The patent replaces manual mechanical measurement tools (goniometer) with an automated optical motion capture system using infrared cameras and depth mapping technology. This substitution eliminates the time-consuming manual measurement process while maintaining or improving measurement precision through automated 3D tracking of joint positions throughout the entire range of motion.
Solution Approach 2:
The system enables self-service evaluation by automatically capturing and analyzing motion data without requiring skilled manual measurers. The automated system performs the entire evaluation process independently, from data collection to metric generation, eliminating the need for time-consuming manual intervention while providing consistent, objective measurements.
2Measurement precision
If objective data collection on workers joint movement is performed manually, then measurement precision improves, but the process becomes prohibitively expensive and difficult
Solution Approach 1:
The patent employs a multi-functional optical motion capture system that simultaneously performs multiple tasks: capturing 3D joint positions, tracking movement throughout the entire range of motion, generating comprehensive metrics (angular displacement, velocity, acceleration), and providing objective data for ergonomic analysis. This unified system replaces multiple separate manual measurement processes with a single integrated solution.
Solution Approach 2:
The system substitutes complex manual data collection procedures with automated optical sensing and computational algorithms. The infrared-based depth mapping technology automatically extracts joint positions and motion parameters from video data, eliminating the need for manual goniometer measurements and reducing the overall complexity of data collection while improving precision.
3Measurement precision
If industrial rehab evaluator monitors each action and takes measurements with tape and goniometer, then measurement precision is achieved, but the evaluation process becomes time-consuming
Solution Approach 1:
The automated motion capture system performs self-service evaluation by independently capturing, processing, and analyzing worker movements without requiring continuous manual intervention. The system automatically generates compliance determinations and evaluation reports, significantly increasing evaluation throughput while maintaining the precision needed for NIOSH and OSHA standards compliance.
Solution Approach 2:
The optical motion capture system enables continuous recording of worker movements throughout the entire functional task without interruption. Unlike manual measurements that require discrete actions, the automated system continuously tracks joint positions and generates metrics in real-time, allowing rapid sequential evaluations of multiple workers without losing measurement precision.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This system objectively tracks and evaluates joint movements, reducing the need for manual measurements, improving ergonomic training, enhancing workplace safety, and facilitating compliance with standards like NIOSH and OSHA, while reducing travel costs and improving data accuracy in industrial rehabilitation and physical therapy.
Implementation Method 1
the projector emits a known infrared pattern and the camera captures infrared points in the scene
Data Source
AI summary
A system and method for range of motion evaluation and recording for physical therapy, ergonomics, training, and individual rehabilitation. While talking with the physical therapists, a frequently mentioned problem they encountered was to evaluate the range of motion of a patient during the performance of functional movements like standing up from a chair, taking objects off of the ground, squatting, and gait analysis. Physical therapists currently use a goniometer to measure the motion of a single angle and visually inspect for inconsistencies and subjectively assess the patient during performance of functional tasks.