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Skin topography measurement by interference fringe projection: a technical validation.
J M Lagarde1, C Rouvrais, D Black
1Centre Jean-Louis Alibert, Institut de Recherche Pierre Fabre, Toulouse, France.
Summary
The Dermatop system accurately measures skin topography using fringe projection profilometry. Proper calibration minimizes lighting variations, ensuring reliable results for cosmetic applications.
Area of Science:
- Dermatology
- Cosmetology
- Biomedical Engineering
Background:
- Quantitative skin topography analysis is crucial for evaluating cosmetic product efficacy.
- Existing methods for 3-D skin reconstruction include optical and laser profilometry.
- Standardized protocols are needed to ensure reliable skin topography measurements.
Purpose of the Study:
- To evaluate the Dermatop system for quantitative skin topography analysis.
- To assess the influence of ambient lighting and calibration on measurement accuracy.
- To determine the repeatability and reproducibility of the Dermatop system.
Main Methods:
- The Dermatop system, utilizing interference fringe projection profilometry, was tested.
- Experiments evaluated ambient lighting effects, calibration device influence, and calibration for lighting correction.
- Accuracy, repeatability, and reproducibility were assessed using metal standards and skin replicas.
Main Results:
- External lighting can introduce up to 5% error in SPa, SPt, and SPtm parameters without systematic calibration.
- Standardized protocols were developed to minimize lighting-related issues.
- High correlation coefficients (0.9955 for SPa, 0.9983 for SPtm) and low variations (<4% repeatability, <6% reproducibility) were achieved.
Conclusions:
- The Dermatop system offers satisfactory accuracy, repeatability, and reproducibility for skin topography analysis.
- It presents a cost-effective solution with minimal time requirements for routine cosmetic studies.
- The system is suitable for quantitative micro- and macro-topography studies in cosmetology.