Skin Volume Characterization via Passive Stereoscopy
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for characterizing facial skin volume distribution are inadequate in precision and portability, failing to effectively quantify morphological variations and demonstrate cosmetic effects in three dimensions.
Innovation Solution
A contactless, in vivo method using passive stereoscopy to acquire three-dimensional images of the body surface, calculating parameters such as the average direction of gradients and curvature of polyhedral mesh lines, allowing for precise and reproducible characterization of volume distribution and migration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If fringe projection device is used to measure skin elasticity and morphological variations, then measurement precision is improved, but device complexity and portability worsen
Solution Approach 1:
The patent replaces the complex mechanical fringe projection system with a digital image processing approach using standard cameras and software algorithms. The 3D surface reconstruction is achieved through photogrammetry and image correlation techniques rather than mechanical projection of fringes, eliminating bulky optical components while maintaining measurement capability
Solution Approach 2:
The patent creates digital copies (images) of the skin surface from multiple camera angles and uses image processing to extract morphological information. Instead of physically projecting patterns, the system captures and analyzes optical images, converting visual information into quantitative 3D surface data through computational methods
2Measurement precision
If fringe projection device is used to measure skin elasticity, then measurement precision is improved, but ease of operation worsens due to repositioning table requirement
Solution Approach 1:
The system automatically performs 3D reconstruction and morphological analysis through software processing of captured images. The computer executes algorithms to generate surface maps and elasticity measurements without requiring manual intervention or specialized positioning equipment, making the system as easy to operate as taking photographs
Solution Approach 2:
The patent replaces the mechanical repositioning table with a software-based image processing workflow. Instead of physically moving the subject or equipment on precision tables, the system uses digital image correlation and 3D reconstruction algorithms to achieve the same measurement objectives with standard photography equipment
3Device complexity
If two-dimensional facial contour reconstruction is used, then device complexity is reduced, but measurement precision worsens due to insufficient resolution
Solution Approach 1:
The patent transitions from 2D contour analysis to 3D surface reconstruction by capturing images from multiple angles and processing them to generate three-dimensional surface maps. This dimensional enhancement provides depth information and significantly improves the resolution and accuracy of morphological measurements while using simple camera equipment
Solution Approach 2:
The patent changes the measurement parameters from 2D contour coordinates to 3D surface topology parameters including elevation, curvature, and volume. By transforming the data representation from flat images to three-dimensional surface models, the system achieves higher measurement precision for detecting subtle morphological variations in facial features
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 objective and meaningful characterization of skin volume distribution, correlating with visual perception and effectively evaluating cosmetic effects on skin firmness and elasticity.
Implementation Method 1
acquiring two three-dimensional images of the surface of at least one part of the body of said individual or person by passive stereoscopy
Data Source
Figure 1
Figure 2
AI summary
The present invention concerns a method for characterising the distribution of volumes of the surface of the skin of an individual, for application, in particular, in the assessment of the effect of firming cosmetic products. This method uses the isolines and the gradients of the slopes calculated from a three-dimensional representation of the surface of the skin.