3D Facial Sagging Evaluation Using Gravity-Induced Shape Changes
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Solution Overview
Problem
Conventional methods for evaluating facial sagging do not adequately understand the underlying reasons for the sagging appearance, leading to inadequate evaluation based on relevant factors.
Innovation Solution
A method that calculates gravity-induced prominence and hollowness amounts from three-dimensional face images in horizontal and vertical positions, and evaluates sagging using intrafacial movement induced sag and anteroposterior buccal sag amounts as indices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional geometric area measurement methods are used to evaluate facial sagging, then the evaluation process is simple, but the understanding of underlying causes is insufficient and evaluation accuracy is inadequate
Solution Approach 1:
The patent segments the complex sagging evaluation into distinct components by measuring facial landmarks (eyes, nose, mouth, chin, cheeks) and calculating specific geometric parameters (area, perimeter, circularity) for each region. This segmentation allows precise measurement of sagging in different facial zones while maintaining a systematic evaluation framework that balances complexity and accuracy.
Solution Approach 2:
The patent transitions from conventional two-dimensional image analysis to three-dimensional spatial measurement by calculating volumetric parameters and multi-dimensional geometric relationships between facial landmarks. This dimensional enhancement enables more accurate assessment of facial sagging by capturing depth and spatial configuration, directly improving measurement precision.
2Loss of information
If comprehensive three-dimensional measurements are taken in multiple positions, then sagging factors are accurately identified, but the measurement process and time required increase
Solution Approach 1:
The patent performs preliminary actions by capturing facial images in both horizontal and vertical positions before analysis, and pre-calculates landmark coordinates and geometric parameters. This preliminary data collection and processing enables comprehensive sagging assessment without requiring repeated measurements during the evaluation phase, thereby reducing total evaluation time while maintaining information completeness.
Solution Approach 2:
The patent establishes continuous measurement relationships by comparing facial geometry across different positions (horizontal and vertical) to identify sagging patterns. This continuous assessment approach ensures complete capture of gravity-induced changes while streamlining the process through automated coordinate tracking, preventing information loss without proportionally increasing time requirements.
3Measurement precision
If multiple sagging indices are calculated from posture changes, then evaluation comprehensiveness improves, but calculation complexity increases
Solution Approach 1:
The patent employs parameter changes by deriving multiple sagging indices (area change, perimeter change, circularity change, positional displacement) from the same set of facial landmark coordinates. This approach enables precise multi-faceted assessment of sagging while avoiding the need for separate measurement systems, as all parameters are calculated from unified coordinate data, thereby managing calculation complexity efficiently.
Solution Approach 2:
The patent creates a universal evaluation framework where a single set of facial landmark measurements serves multiple assessment functions. The same coordinate data is used to calculate various geometric parameters and sagging indices, making the measurement system multi-functional. This universality reduces overall system complexity while maintaining comprehensive assessment precision, as one measurement system performs multiple evaluation tasks.
Data Source
AI summary
Factors that cause a sagging appearance are found, and sagging is evaluated based on the found factors. A method according to one embodiment of the present disclosure includes a step of acquiring a gravity-induced prominence amount and a gravity-induced hollowness amount that are acquired from a change between a three-dimensional shape of a three-dimensional face image of a subject in a horizontal position and a three-dimensional shape of a three-dimensional face image of the subject in a vertical position; a step of calculating an intrafacial movement induced sag amount and an anteroposterior buccal sag amount from the gravity-induced prominence amount and the gravity-induced hollowness amount; and a step of evaluating a type of sagging and a degree thereof based on the intrafacial movement induced sag amount and the anteroposterior buccal sag amount as indices.