Body Motion Grading Using Relative Position Comparison
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Solution Overview
Problem
Existing body motion grading systems are affected by differences in body build and do not consider timing, such as sense of rhythm, when evaluating motion.
Innovation Solution
A system that includes a body position information acquisition unit, a body part recognition unit, a body motion grading unit, and a grading result display unit, which acquires and compares body position information in time series, relative to a reference, and weights scores based on timing to assess both correctness and rhythm.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If vector comparison is used for motion grading, then the grading process is simple, but the grading accuracy is affected by differences in target person's body build
Solution Approach 1:
The patent changes the parameter basis from absolute vector comparison to relative position comparison. Instead of comparing absolute positions that are affected by body build differences, the system compares relative positions between body parts (e.g., position of hand relative to shoulder), which eliminates the influence of individual body size and build variations while maintaining grading simplicity.
2Device complexity
If only correctness of motion is graded, then the grading criteria are simple, but the evaluation is incomplete without considering timing and rhythm
Solution Approach 1:
The patent segments the motion evaluation into two independent dimensions: spatial correctness (position accuracy) and temporal accuracy (timing and rhythm). By dividing the grading criteria into these separate components, the system can comprehensively evaluate both aspects without excessive complexity, using time-series comparison to assess timing while maintaining clear distinction from position-based correctness evaluation.
Data Source
AI summary
The present invention is intended to provide a body motion grading system that allows the grading less likely to be affected by the difference among the builds of target persons subjected to grading. The present invention provides body motion grading system (1) including body position information acquisition unit (11) configured to acquire body position information of a target person subjected to grading in time series, body part recognition unit (12) configured to recognize a position of each part in the acquired body position information in time series and relatively recognize positions of body parts with reference to a certain body part, body motion grading unit (13) configured to conduct grading by comparing a position of a body part recognized by the body part recognition unit with a preliminarily prepared comparison condition in time series, and grading result display unit (14) configured to display a grading result.