Target Frame Mirror Calibration for Motion Tracking Accuracy
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Solution Overview
Problem
Existing motion tracking systems face challenges in accurately recording the relative locations of beacons attached to moving objects, particularly when large areas are involved, leading to errors in the representation of body part movements and their relation to the ground.
Innovation Solution
A staging system is calibrated using a method that involves generating and reflecting light beams to adjust the orientation of a target frame mirror relative to a pivot axis, allowing for precise determination of beacon locations, which are then verified against motion tracking system locations to ensure accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a motion tracking system uses a large area for tracking athletes, then the coverage area is improved, but the accuracy of beacon locations and relative positions deteriorates
Solution Approach 1:
The patent applies parameter changes by introducing a calibration process that determines and adjusts system parameters (camera positions, beacon locations, transformation matrices) to maintain accuracy across large tracking areas. The calibration light beam method allows the system to adapt parameters to compensate for errors that accumulate over large distances, resolving the contradiction between large coverage area and maintained measurement precision.
2Adaptability or versatility
If the motion tracking system records beacon locations over large movement areas, then the range of motion capture is improved, but the consistency of relative positions and orientations deteriorates
Solution Approach 1:
The patent implements feedback through a calibration process where the system measures actual beacon positions using a calibration light beam and compares them against expected positions. The system then uses this feedback to adjust transformation matrices and correction values, ensuring that relative positions and orientations remain consistent even when athletes move through large areas. This closed-loop approach maintains stability while allowing broad adaptability.
3Measurement precision
If the motion tracking system uses multiple cameras to track athletes, then the measurement capability is improved, but the complexity of determining accurate beacon locations worsens
Solution Approach 1:
The patent applies preliminary action by performing a calibration process before actual motion tracking. During calibration, the system pre-determines camera positions, beacon locations, and transformation matrices using a calibration light beam. This preliminary setup creates reference data and correction values that simplify subsequent tracking operations, reducing the computational complexity of the positioning algorithm while maintaining high measurement precision through multi-camera systems.
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 solution enhances the accuracy of motion tracking systems by ensuring precise beacon positioning, reducing errors in the representation of object movements and their spatial relations, thereby improving the fidelity of computer-generated renderings.
Implementation Method 1
generating a stage calibration light beam, reflecting the stage calibration light beam from a target frame mirror
Data Source
AI summary
A staging system has to be calibrated to determine a location of a horizontal pivot axis of a target frame. A stage calibration light beam is generated and reflected from a target frame mirror. The target frame is pivoted between first and second positions and the locations of the stage calibration light beam are detected. The locations of the stage calibration light beam provide a value representing an orientation of the target frame mirror relative to the horizontal pivot axis. The orientation of the target frame mirror is then adjusted based on the value so that the target frame mirror is more normal to the horizontal pivot axis.