Posture Specification Using Joint Angles and Body Direction
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Solution Overview
Problem
Existing techniques for specifying a person's posture based on joint angles fail to uniquely distinguish between different postures when joint angles are the same, leading to incorrect posture identification.
Innovation Solution
A posture specifying program and method that uses both joint angles and directional information of the upper and lower body parts, such as vertical and horizontal orientations, to uniquely specify a person's posture by analyzing video data from a monocular camera.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If only joint angles are used to specify posture, then the specification process is simple, but the posture cannot be uniquely distinguished when joint angles are the same
Solution Approach 1:
The patent introduces directional information (vertical and horizontal directions of body parts) as an additional dimension beyond joint angles. This transforms the posture specification from a one-dimensional joint angle measurement to a two-dimensional specification that includes both joint angles and directional orientations, enabling unique posture identification.
Solution Approach 2:
The patent changes the parameters used for posture specification by adding directional parameters (vertical direction, horizontal direction) to the existing joint angle parameters. This parameter expansion allows the system to distinguish between different postures that would otherwise have identical joint angle configurations.
2Measurement precision
If directional information is added to joint angles, then posture can be uniquely specified, but the processing complexity increases
Solution Approach 1:
The patent segments the directional information into two independent components: vertical direction and horizontal direction. This segmentation allows the processing system to handle each directional component separately, reducing the overall complexity compared to processing a single complex directional vector.
Solution Approach 2:
The patent creates a universal posture specification framework that can handle multiple types of information (joint angles, vertical direction, horizontal direction) within a unified structure. This multi-functional approach allows the same processing logic to be applied regardless of which combination of parameters is available.
Data Source
AI summary
A non-transitory computer-readable recording medium stores a posture specification program causing a computer to execute: generating skeleton information indicating two dimensional coordinates of a plurality of joints of a person based on visual information which is obtained by capturing the person; setting angles of the plurality of joints and a direction of a part of the person based on the skeleton information; and specifying a posture of the person based on the angles of the plurality of joints and the direction of the part of the person.