Motion Analysis Device Dominant Hand Detection
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Solution Overview
Problem
Existing motion analysis devices struggle to automatically determine the dominant hand of subjects, leading to difficulties in comparing and analyzing swing motion data from individuals with different dominant hands, as the data cannot be directly superimposed due to reversed rotating directions.
Innovation Solution
A method and device that utilize inertial sensors to determine the dominant hand by analyzing unique features such as rotating direction or angular velocity, allowing for the automatic addition of dominant hand information to motion analysis data and subsequent inversion of data for display purposes, enabling comparison of swing trajectories between right- and left-handed subjects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If motion analysis data from subjects with different dominant hands are compared directly, then the analysis process is simple, but the rotating directions of swing trajectories are displayed as opposite directions and cannot be superimposed and compared
Solution Approach 1:
The system performs preliminary determination of dominant hand information before comparing motion analysis data. By analyzing swing trajectory data and determining the dominant hand in advance, the system prepares the data for proper alignment and superposition, enabling accurate comparison between subjects with different dominant hands.
Solution Approach 2:
When subjects with different dominant hands are detected, the system inverts the swing trajectory data of one subject to match the rotating direction of the other. This inversion allows mirror-image swing patterns from left-handed and right-handed subjects to be properly aligned and superimposed for meaningful comparison.
2Loss of information
If dominant hand information is provided in advance and processing to invert images is carried out, then data from subjects with different dominant hands can be compared, but the process becomes complex and time-consuming
Solution Approach 1:
The system automatically determines dominant hand information by analyzing swing trajectory data without requiring manual input from users. The processing unit autonomously identifies the dominant hand based on the characteristics of the swing motion, eliminating the need for users to manually provide dominant hand information and reducing operational complexity.
Solution Approach 2:
The system uses feedback from the swing trajectory analysis to automatically adjust the processing of motion data. By continuously analyzing the swing patterns and detecting dominant hand information, the system dynamically determines whether inversion processing is needed, creating a closed-loop system that simplifies user interaction while maintaining data accuracy.
3Extent of automation
If dominant hand information is automatically determined using inertial sensor output, then the determination process is automated, but additional processing steps are required
Solution Approach 1:
The motion analysis device performs multiple functions using the same inertial sensor data: it not only analyzes swing trajectories but also automatically determines dominant hand information from the same data. This multi-functional approach allows the system to extract multiple types of information from a single data source, reducing the need for separate sensors or input methods.
Solution Approach 2:
The system combines the dominant hand determination process with the existing swing analysis process. By integrating the dominant hand detection into the same data processing pipeline that analyzes swing trajectories, the system merges two functions into one unified process, minimizing additional processing steps while achieving automatic dominant hand identification.
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 easy and secure determination of dominant hands and facilitates easier comparison of motion analysis data by displaying swing trajectories in a consistent direction, enhancing the analysis process by allowing for the superimposition of left- and right-handed motion data.
Implementation Method 1
an inertial sensor is installed on the sporting gear. A swing action is visually reproduced on the basis of an output from the inertial sensor
Data Source
AI summary
A motion analysis device has a determination unit which uses an output from an inertial sensor mounted on at least one of a subject and a tool operated by the subject, to determine a dominant hand of the subject in a swing. The determination unit can determine the dominant hand on the basis of the sign of angular velocity or acceleration from the inertial sensor. A calculation unit which calculates motion analysis information in a swing, using an output from the inertial sensor can add dominant hand information from the determination unit to the motion analysis information. The motion analysis device can include a coincidence determination unit which determines that a first subject and a second subject have different dominant hands, and an inverted image generation unit which inverts first motion analysis information in the case of no coincidence.