Facial Coordinate Mapping for Skin Analysis Comparison
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Solution Overview
Problem
Existing skin analysis methods struggle to accurately compare changes in skin condition over time, particularly when facial images are taken at different timings or with varying facial sizes and compositions, making it difficult to recognize changes in specific regions of the face, such as after treatment.
Innovation Solution
A skin analyzing device that sets facial coordinates based on recognized facial portions, allowing for the identification of a common region of interest across different facial images, enabling the display of skin analysis results for comparison, thereby facilitating the recognition of changes in skin condition over time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If facial images are taken at different timings with varying facial sizes and compositions, then the ability to capture skin condition changes is improved, but the ability to accurately compare specific regions across images deteriorates
Solution Approach 1:
The patent introduces facial coordinates as an intermediary reference system that mediates between multiple facial images taken at different times. By establishing coordinate systems based on stable facial landmarks (eyes, nose, mouth positions) and using transformation calculations, the system enables accurate correspondence of regions across images despite variations in facial size and composition, thus resolving the contradiction between capturing multiple images and maintaining comparison accuracy
2Adaptability or versatility
If the length to width ratio of facial images is changed for comparison, then the ability to display different images is improved, but the ability to recognize changes in partial regions deteriorates
Solution Approach 1:
The patent applies local quality by maintaining consistent coordinate systems and region definitions for specific facial areas across different images. Even when images have different aspect ratios or compositions, the system ensures that corresponding regions (such as a treatment area on the cheek) are defined by the same facial coordinates in each image, allowing accurate local comparison while permitting global display flexibility
3Ease of operation
If automated facial coordinate setting is implemented, then the ease of operation is improved, but the device complexity increases
Solution Approach 1:
The system implements self-service by automatically performing facial landmark detection, coordinate system establishment, and region correspondence calculations without requiring manual intervention. The automated processing of identifying facial features, setting coordinates, and matching regions across images eliminates the need for operators to manually align images or define comparison areas, thereby improving ease of operation despite the underlying computational complexity
Data Source
AI summary
A skin analyzing device includes: a facial coordinates setting unit that sets facial coordinates on a facial image of a measurement subject by using, as a reference, a position of a facial portion identified from the facial image, a region-of-interest setting unit that sets a first region of interest to a first facial image of the measurement subject, and sets a second region of interest that has facial coordinates in common with the first region of interest to a second facial image of the measurement subject, and a skin analysis user interface (UI) unit that displays the first facial image and the second facial image next to each other, and displays a skin analysis result in the first region of interest with respect to the first facial image and a skin analysis result in the second region of interest with respect to the second facial image.