IMU-Video Synchronization for Indoor Rescue Path Tracking
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Solution Overview
Problem
Existing systems for locating personnel in hazardous environments, such as firefighters in burning buildings, are inefficient and complex, often relying on GPS which does not penetrate buildings and require precise location information, making it difficult to quickly and accurately locate incapacitated personnel.
Innovation Solution
A rescue apparatus comprising a user device with a camera and inertial motion unit (IMU) that captures and transmits video and motion data, and a rescue device that replays the video with superimposed indicia based on IMU data to help retracing the user's path, enabling effective location of the personnel without prior knowledge of their location.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used for locating personnel, then location information can be obtained, but GPS signal penetration through buildings is poor making it ineffective indoors
Solution Approach 1:
The patent uses an intermediary system consisting of IMU sensors and video recording devices mounted on firefighter equipment. When GPS signals are unavailable indoors, the IMU sensors continuously track motion data (acceleration, orientation, position changes) and video cameras record the environment. This intermediary tracking system bridges the gap where GPS fails, allowing rescuers to reconstruct the firefighter's path and location through data processing and visualization on handheld devices.
2Measurement precision
If complex systems are implemented for personnel tracking, then location precision can be improved, but system complexity increases making implementation difficult
Solution Approach 1:
The patent integrates multiple functions into a single wearable system: the firefighter's equipment includes mounted video cameras, IMU sensors, and communication devices that simultaneously perform navigation, tracking, recording, and emergency communication functions. This multi-functional approach achieves precise location tracking without requiring separate complex systems, as the same hardware serves multiple purposes including path reconstruction and real-time communication with rescue teams.
Solution Approach 2:
The system automatically tracks and records firefighter position and environmental data without requiring manual input or complex configuration. The IMU sensors continuously self-measure motion parameters, cameras automatically capture video, and the system self-processes this data to generate location information and transmit it to rescuers, eliminating the need for complex manual tracking procedures.
3Loss of time
If real-time location tracking is implemented, then rescue response time can be reduced, but data transmission and processing requirements increase
Solution Approach 1:
The system transmits data selectively rather than continuously - it sends key location updates, environmental hazard information, and emergency alerts to rescuers, rather than transmitting every single sensor reading. This partial transmission approach provides sufficient information for rescue operations while significantly reducing energy consumption and data processing requirements compared to continuous full-data transmission.
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
Facilitates rapid and efficient location of personnel by providing a clear, visual representation of the user's path, allowing rescuers to navigate through complex environments and reach incapacitated individuals quickly, even in areas with poor GPS signal penetration.
Implementation Method 1
an inertial motion unit (IMU) that captures and transmits video and motion data
Data Source
AI summary
Systems and methods for collecting and recording video data and inertial motion unit (IMU) data associated with the video data representative of a path of traversal, transmitting the video data and IMU data associated with the video data to a rescue device that includes a display, and subsequently replaying the video data on the display of the rescue device along with viewable indicia, based on the IMU data associated with the video data, that is indicative of the motion of a user when the video data was collected and recorded.