Cascading IMU Communications for Camera-Free Full-Body Motion Capture
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Solution Overview
Problem
Existing full-body motion capture systems are limited in their ability to function in non-controlled environments without external cameras, often requiring expensive equipment, specialized suits, and complex calibration procedures, and they may lose calibration when moved to different areas.
Innovation Solution
A cascading communication system using inertial measurement units (IMUs) with sensors, such as accelerometers, magnetometers, and gyroscopes, to track body movements without external cameras, allowing for portable and untethered motion capture in non-controlled environments, with a linking device to synchronize and consolidate data from multiple trackers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If external cameras and specialized suits are used for motion capture, then measurement precision is improved, but device complexity and cost increase
Solution Approach 1:
The patent extracts the motion capture functionality from complex external camera systems and specialized suits, placing inertial measurement units directly on the body segments. This eliminates the need for external cameras while maintaining measurement capability through self-contained sensors that track orientation and position independently.
Solution Approach 2:
The patent replaces the optical-mechanical camera system with an inertial sensing system using accelerometers, gyroscopes, and magnetometers. This substitution eliminates complex optical infrastructure and calibration requirements while providing continuous motion data through direct physical measurement of acceleration and orientation.
2Measurement precision
If external cameras are used for motion capture, then measurement precision is improved, but ease of operation deteriorates due to complex calibration procedures
Solution Approach 1:
The inertial measurement units are self-contained and autonomously calculate orientation and position from their sensor data without requiring external reference systems. The devices independently process accelerometer, gyroscope, and magnetometer readings to determine body segment orientation, eliminating the need for external camera calibration and specialized environmental setup.
3Measurement precision
If specialized suits and expensive equipment are used, then measurement precision is improved, but loss of substance increases
Solution Approach 1:
The patent uses inexpensive inertial measurement units that can be mass-produced with standard consumer electronics components rather than expensive specialized camera equipment. The system replaces costly optical infrastructure with affordable microelectromechanical sensors, significantly reducing overall system cost while maintaining measurement functionality.
4Adaptability or versatility
If external cameras are used in non-controlled environments, then adaptability is improved, but measurement precision deteriorates
Solution Approach 1:
The patent divides the motion capture system into independent segmental units, each with its own inertial measurement unit tracking a specific body segment. This segmentation allows each sensor to independently measure local orientation and position without requiring global environmental references, enabling accurate motion capture in diverse uncontrolled environments where external cameras would fail.
Data Source
AI summary
Prior art systems can achieve full-body motion capture without external cameras; however, these systems are often expensive, limit the user's movements to a specified area, require the user to wear a specialized full-body suit, have a high device count, may be fully wired and/or require an energy-intensive WiFi connection. These systems also often require a thorough calibration procedure before each use and can lose their calibration when moving to different areas. The presently disclosed technology is directed to systems and methods for providing full-body motion capture in non-controlled environments where using multiple known camera perspectives is not possible or practical. Specifically, the presently disclosed technology utilizes cascading communications to connect an array of sensing devices to a common linking device to distinguish data packets from each of the sensing devices.