Augmented Reality Gait Analysis Using Floor-Projected Paths

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Solution Overview

Problem

Conventional gait analysis methods require attached sensors and controlled laboratory environments, making them costly and impractical for everyday use, especially for identifying and correcting poor gait habits in individuals, particularly children and teenagers.

Innovation Solution

A gait analysis method and device using an augmented reality interactive sports device that projects a video onto a floor surface and tracks user motion with a lidar sensor, allowing for the measurement of foot position information and analysis of gait straightness and rhythm without the need for attached sensors or controlled environments.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If conventional gait analysis methods use attached sensors and controlled laboratory environments, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improvegait measurement accuracyVSAvoidsensor attachment and equipment requirements

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces the mechanical sensor attachment system with an optical field-based LIDAR system. Instead of physically attaching sensors to the user's body, the system uses laser beams to non-contactedly measure foot position and gait parameters, thereby eliminating the complexity of sensor attachment while maintaining measurement precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent introduces a camera or LIDAR sensor as an intermediary device that captures foot position information from a distance. This intermediary allows the system to measure gait parameters without direct contact with the user, replacing the need for attached sensors and simplifying the overall system

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If conventional gait analysis methods use multiple sensors and controlled environments, then measurement precision is improved, but ease of operation deteriorates

Engineering Contradiction:

Improvegait analysis accuracyVSAvoidaccessibility for everyday use

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The patent replaces complex mechanical sensor attachment procedures with a simple optical measurement system. Users can undergo gait analysis by simply walking in front of the camera or LIDAR sensor, eliminating the need for sensor attachment and making the system easy to operate for everyday use

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system enables users to perform gait analysis independently without requiring professional assistance for sensor attachment or controlled environment setup. The automated optical measurement system captures and processes gait data automatically, making the service accessible to anyone

Inventive Principle:

Principle #25Self-service

3Measurement precision

If conventional gait analysis methods use multiple sensors and equipment, then measurement precision is improved, but loss of time increases

Engineering Contradiction:

Improvegait measurement accuracyVSAvoidtime required for setup and measurement

Core Design Contradiction:

Measurement precisionVSLoss of time

Solution Approach 1:

The patent eliminates the time-consuming process of attaching and configuring multiple sensors by using a single optical measurement system. The camera or LIDAR sensor automatically captures gait data without requiring manual sensor attachment, significantly reducing setup time while maintaining measurement precision

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs automated calibration and setup in advance, allowing users to immediately begin gait measurement without time-consuming manual configuration. The optical system is pre-configured to capture gait parameters, eliminating the need for on-site sensor setup

Inventive Principle:

Principle #10Preliminary action

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

Enables convenient, low-cost gait analysis that can be performed in everyday environments, helping to identify and correct poor gait habits by providing real-time feedback on gait straightness and rhythm.

Implementation Method 1

track user motion by using a lidar sensor part

Methodology Applied

Scientific EffectLIDAR: LIDAR

Implementation Method 2

laser scan a plane at a predetermined height from the floor surface

Methodology Applied

Scientific EffectLaser: Laser

Data Source

PatentUS20250288869A1Gait analysis method and device using augmented reality interactive sports device

Publication Date: 2025.09.18 TWOHANDSINTERACTIVE CO LTD

AI summary

Proposed are a gait analysis method and device using an augmented reality interactive sports device, the gait analysis method and device showing a gait path on a floor surface with the augmented reality interactive sports device and measuring foot position information of a user moving along the gait path to analyze and provide gait straightness and gait rhythm, thereby performing gait analysis conveniently with ease and at low cost by using the augmented reality interactive sports device used for various sports rather than an attached sensor or a controlled laboratory environment, and thus helping to identify poor gait habits and develop good gait habits.