Magnetic Sensor Motion Capture Glove Joint Detection
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Solution Overview
Problem
Current motion capture systems face challenges in accurately detecting hand movements due to the large size of markers, which can occlude joints, increase computing resource requirements, and lead to noise and breakage issues with resistive flex strips and fiber optic solutions.
Innovation Solution
A motion capture glove equipped with magnetic sensors, such as Hall Effect sensors, positioned around joints and between digits to detect hand configurations, providing accurate and noise-free data with reduced risk of breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional motion capture markers are used, then hand movement detection can be achieved, but the large size of markers occludes joints and reduces measurement precision
Solution Approach 1:
The patent replaces traditional optical markers with magnetic sensors and magnets. Instead of using visual markers detected by cameras, the system uses magnetic field interactions between sensors and magnets attached to hand segments. This substitution eliminates the occlusion problem caused by large visual markers while maintaining motion detection capability, directly resolving the contradiction between measurement precision and marker size.
Solution Approach 2:
The patent changes the detection parameter from optical (visual markers) to magnetic (magnetic field strength and direction). By using magnetic sensors to detect the position and orientation of magnets attached to hand segments, the system achieves accurate joint detection without requiring large physical markers, thus improving measurement precision while reducing the area occupied by detection elements.
2Reliability
If resistive flex strips are used for motion capture, then hand configuration can be detected, but the strips are prone to breakage and produce noise
Solution Approach 1:
The patent replaces mechanical resistive flex strips with magnetic sensors. Instead of measuring resistance changes in flexible strips that are prone to breaking and generating noise, the system uses magnetic sensors to detect the position and orientation of magnets. This substitution eliminates the mechanical wear and tear issues while providing more reliable and noise-free signals, directly addressing the reliability contradiction.
3Measurement precision
If fiber optic solutions are used for motion capture, then hand movements can be detected, but the solutions are complex and prone to breakage
Solution Approach 1:
The patent replaces complex fiber optic systems with simpler magnetic sensor-based detection. Instead of using light transmission through flexible optical fibers that require complex routing and are susceptible to damage, the system uses magnetic sensors that can be easily integrated into glove material. This substitution significantly reduces device complexity while maintaining movement detection accuracy.
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
The magnetic sensor-based motion capture glove offers more accurate and reliable data capture of hand movements, enabling the creation of realistic animations while being less prone to damage.
Implementation Method 1
the first joint magnetic sensor system produces a voltage signal based at least in part on a position of a first magnetic sensor with respect to a first corresponding magnet of the first joint magnetic sensor system
Data Source
AI summary
A motion capture glove may use a set of sensors to detect the motion of fingers. Pairs of magnets and magnetic sensors may be positioned along portions of a hand that are capable of movement or bending. For example, a magnet may be positioned on one side of a top of the joint and a magnetic sensor on the opposite side of the top of the joint. As a user bends the finger, the sensor is moved further away from the magnet. An electrical signal generated by the sensor may vary as the distance between the sensor and the magnet varies. The strength of the electrical signal may be used to determine a configuration of the joint. A determination of the configuration of each joint may be used to determine a configuration of a hand, which can be used to generate an animation of motion capture clip.