Motion Tracker Position Assessment via Optical Feedback
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Solution Overview
Problem
Motion tracking systems face inaccuracies due to incorrect positioning of trackers, which is critical in rehabilitation procedures where incorrect supervision can lead to further injury, necessitating a method to assess and correct tracker placement.
Innovation Solution
A method using optical sensing devices and computing devices with inertial sensors and light emitters to determine the correct positioning of trackers on the body by processing images and comparing them against a predetermined configuration, providing user perceptible signals for correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If motion trackers are positioned on the person without digital assessment, then the setup process is simple and quick, but the motion tracking sequence accuracy deteriorates
Solution Approach 1:
The system captures images of the person with trackers, digitally processes these images to determine actual tracker positions, compares them with expected positions, and provides feedback signals to indicate correct or incorrect positioning. This closed-loop feedback mechanism ensures accurate tracker placement without requiring complex manual assessment procedures.
Solution Approach 2:
The patent replaces manual visual inspection and physical measurement methods with an automated optical sensing system that uses cameras and image processing algorithms to detect tracker positions. This substitution of mechanical/manual processes with optical-digital systems improves precision while keeping the overall system complexity manageable.
2Reliability
If tracker positioning is not accurately assessed, then the system operation remains simple, but the reliability of rehabilitation supervision deteriorates
Solution Approach 1:
The system performs tracker positioning assessment before initiating the rehabilitation exercise program. By checking tracker positions in advance and providing correction signals, the system ensures reliable data collection from the start, preventing inaccurate measurements that would compromise rehabilitation supervision reliability.
Solution Approach 2:
The motion tracking system automatically assesses its own tracker positioning using integrated optical sensors and image processing, without requiring external verification equipment or expert intervention. This self-diagnostic capability enhances reliability while avoiding the complexity of external assessment systems.
3Measurement precision
If manual tracker positioning verification is used, then the system complexity is low, but the measurement precision of tracker positions deteriorates
Solution Approach 1:
The patent replaces manual visual verification with an automated optical sensing system that uses cameras to capture images and digital image processing to precisely determine tracker positions. This automation achieves high measurement precision through algorithmic analysis while maintaining manageable system complexity through integrated design.
Solution Approach 2:
The system creates a digital copy (image) of the physical tracker positions on the person's body, then processes this optical copy to accurately determine positions without physically measuring or manually locating each tracker. This copying approach enables precise automated assessment.
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
Ensures accurate tracker placement, enhancing the reliability of motion tracking sequences and reducing the risk of injury during rehabilitation by providing real-time feedback for correct positioning.
Implementation Method 1
each of the one or more trackers being adapted to be arranged on a body of the person and comprising a light emitter... taking one or more images by the optical sensing device... digitally processing, by the computing device, the one or more images to digitally determine both first positions of a plurality of joints of the person... and second positions of the one or more trackers positioned on the person
Data Source
AI summary
A method for assessing whether one or more trackers are positioned on a person according to a predetermined configuration of tracker positions, comprising: transmitting, from a computing device to at least one tracker of the one or more trackers, an instruction to change an operation of the light emitter of the tracker to which the instruction is transmitted; taking one or more images by the optical sensing device; digitally processing the one or more images to digitally determine both first positions of a plurality of joints of the person on each image, and second positions of the one or more trackers positioned on the person on each image based on both a light of the light emitter of each of the one or more trackers and the transmitted instructions; digitally determining on which body member each of the one or more trackers is positioned on the person based on the first and second positions; and digitally comparing the position of each of the one or more trackers on the body members with the predetermined configuration of tracker positions.