Optical Tracking With Retro-Reflective Markers Under High Background Light
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Solution Overview
Problem
Traditional tracking systems face challenges in accurately tracking objects or people in environments with high noise levels and varying light conditions, such as amusement parks, due to issues like false detections and reduced accuracy from background illumination.
Innovation Solution
A dynamic signal to noise ratio tracking system using retro-reflective markers and electromagnetic radiation, where an emitter sends radiation that is reflected back and detected by a subsystem, allowing a control system to monitor and compare patterns to determine object positions and control automated equipment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional tracking systems use electromagnetic radiation detection to track objects, then tracking functionality is provided, but accuracy deteriorates in environments with high noise levels and varying light conditions
Solution Approach 1:
Retro-reflective markers are introduced as intermediary elements that actively return electromagnetic radiation to the detector. These markers serve as mediators between the emitter and detector, ensuring that only radiation reflected from known marker positions is detected, thereby filtering out background illumination noise and improving tracking accuracy in challenging environments.
Solution Approach 2:
The system utilizes retro-reflective markers with specific optical properties that return electromagnetic radiation in a predictable manner. By using markers with distinct reflectivity characteristics, the system can distinguish marker reflections from background illumination, effectively filtering noise and improving measurement precision through optical property differentiation.
2Reliability
If traditional tracking systems operate in amusement park environments, then general tracking is possible, but reliability deteriorates due to false detections from high noise levels
Solution Approach 1:
Retro-reflective markers act as reliable intermediaries that actively return electromagnetic radiation to the detector. This mediator approach ensures that detections are based on known marker positions rather than passive object detection, significantly reducing false detections and improving tracking reliability in noisy amusement park environments with varying light conditions.
Solution Approach 2:
The system employs a active emission and detection scheme where the emitter sends electromagnetic radiation and the detector receives reflected radiation from known marker positions. This feedback mechanism, where the system actively queries for marker positions and receives confirmed responses, eliminates random noise detections and improves reliability by ensuring detections are based on actual marker reflections rather than environmental noise.
3Measurement precision
If pattern comparison is used to identify occluded markers, then position evaluation accuracy is improved, but processing complexity increases
Solution Approach 1:
The system pre-stores reference patterns of electromagnetic radiation reflections from known marker configurations. By having these reference patterns prepared in advance, the real-time processing only requires comparing current detections against the stored library, significantly reducing computational complexity while maintaining high position evaluation accuracy through systematic pattern matching.
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 provides reliable and efficient tracking in noisy and dynamic environments, enabling accurate monitoring of people and objects, and controlling amusement park equipment, even with multiple moving objects and varying light conditions.
Implementation Method 1
A dynamic signal to noise ratio tracking system uses emitted electromagnetic radiation and, in some embodiments, retro-reflection, to enable detection of markers and/or objects
Implementation Method 2
detecting wavelengths of electromagnetic radiation retro-reflected from within the guest attraction area while filtering wavelengths of electromagnetic radiation not retro-reflected
Data Source
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AI summary
A dynamic signal to noise ratio tracking system enables detection of people within the field of view of the tracking system. The tracking system may include an emitter configured to emit electromagnetic radiation within an area, a detector configured to detect electromagnetic radiation reflected back from people and/or objects within the area, and a control unit configured to evaluate signals from the detector and control various automated amusement park equipment as a result of this evaluation.