Quaternion Motion Prediction for Low-Latency Object Tracking

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Solution Overview

Problem

Interactive environments experience latency issues due to sensor and controller lag when tracking user-manipulated objects, leading to reduced user satisfaction.

Innovation Solution

A tracking system that includes a controller updating a quaternion array with the latest quaternion, determining a reference axis and angle, and applying kinematic equations to predict a future quaternion, thereby reducing latency by adjusting images based on predicted object orientation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Loss of time

If traditional sensor and controller systems are used to track user-manipulated objects, then the system structure is simple, but latency occurs between object movement and display adjustment

Engineering Contradiction:
ImprovelatencyVSAvoidsystem complexity
Core Design Contradiction:
Loss of timeVSDevice complexity

Solution Approach 1:

The system performs preliminary actions by storing historical quaternion data in a buffer and pre-calculating predictive models before they are needed. When real-time tracking is required, the system uses pre-stored historical data to quickly generate predictions, avoiding the need for complex real-time calculations and reducing latency.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent implements dynamic prediction by continuously updating the quaternion buffer with new sensor data and adjusting predictive models based on recent motion patterns. The system adapts its prediction algorithm dynamically, using more recent historical data points when the object is moving quickly and fewer points when motion is slow, optimizing both accuracy and response time.

Inventive Principle:
Principle #15Dynamics

2Measurement precision

If quaternion buffer with historical data is used to predict future orientation, then tracking accuracy is improved, but data processing complexity increases

Engineering Contradiction:
Improvetracking accuracyVSAvoiddata processing complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The system applies partial action by using a limited buffer size (e.g., storing only the most recent N quaternions) rather than all historical data. This provides sufficient accuracy for prediction while keeping data processing manageable. The buffer size is optimized to provide the minimum necessary historical context for accurate prediction without overwhelming the processing system.

Inventive Principle:
Principle #16Partial or excessive action

Solution Approach 2:

The patent changes parameters dynamically by adjusting the weight given to different historical quaternion entries based on their age. More recent quaternions are given higher weights in the prediction calculation, while older entries receive lower weights. This parameter change allows the system to focus computational resources on the most relevant data, improving accuracy without proportionally increasing processing complexity.

Inventive Principle:
Principle #35Parameter changes

3Speed

If predictive algorithms are applied to determine future quaternion, then latency is reduced, but computational requirements increase

Engineering Contradiction:
Improveresponse speedVSAvoidcomputational energy
Core Design Contradiction:
SpeedVSUse of energy by moving object

Solution Approach 1:

The system performs preliminary action by pre-processing sensor data into quaternion format and storing it in a buffer as it arrives, rather than waiting to collect all necessary data before processing. This preliminary organization of data enables faster prediction when needed, reducing response time without requiring excessive computational power at the moment of prediction.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The patent substitutes complex mechanical or hardware-based tracking solutions with computational prediction using quaternion mathematics. Instead of using more sophisticated sensors or faster hardware, the system uses mathematical prediction algorithms that run efficiently on standard processors, achieving high response speed with moderate computational energy requirements.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

Data Source

PatentUS20260050356A1System and method for tracking a user-manipulated object within an interactive environment
Publication Date: 2026.02.19 UNIVERSAL CITY STUDIOS LLC
  • US20260050356A1 patent drawing
  • US20260050356A1 patent drawing
  • US20260050356A1 patent drawing

AI summary

A tracking system for a user-manipulated object within an interactive environment includes a controller configured to receive a sensor signal indicative of a latest quaternion of the user-manipulated object and to update a quaternion array with the latest quaternion. The controller is also configured to determine a reference axis and a reference angle of the latest quaternion and to determine a relative angle and a relative time for each quaternion within the quaternion array except for the latest quaternion. Furthermore, the controller is configured to determine an angular velocity and an angular acceleration about the reference axis by applying a filter to a set of kinematic equations. The controller is also configured to determine a future angle of the user-manipulated object based on the angular velocity and the angular acceleration about the reference axis and to determine a future quaternion from the future angle and the reference axis.