An image‐based mapping of significance and relevance of facial skin colour changes of females living in Thailand
Autor: | Marie Cherel, Rainer Voegeli, A. V. Rawlings, Remo Campiche, Sarah Gougeon, Pierre Seroul |
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Rok vydání: | 2019 |
Předmět: |
Adult
Aging genetic structures Pharmaceutical Science Skin Pigmentation Topical treatment significance Dermatology 030226 pharmacology & pharmacy 030207 dermatology & venereal diseases 03 medical and health sciences 0302 clinical medicine Colloid and Surface Chemistry Asian People Drug Discovery medicine Humans facial mapping relevance skin colour Pixel business.industry Pattern recognition Original Articles Middle Aged Cheek Thailand claim substantiation Skin colour Facial skin medicine.anatomical_structure statistics Chemistry (miscellaneous) Face Forehead Female Original Article Artificial intelligence business Image based After treatment |
Zdroj: | International Journal of Cosmetic Science |
ISSN: | 1468-2494 0142-5463 |
Popis: | Objective There are methods to evaluate skin colour on defined areas over the face but no approach automatically and accurately evaluates skin colour variations on large facial areas, comparing subjects, treatments and/or time points. We propose such an image‐based approach to visualize quickly the outcome of clinical studies on colour variations. Methods Among 54 Asian women, one group applied a vehicle twice daily, during 28 days, and the other group an anti‐ageing emulsion, taking facial images at baseline and after treatment. Changes in L*a*b* values were studied on four pre‐selected facial regions. We also reconstructed average facial images from which the L*a*b* parameters were extracted for every pixel, computing relevance (ΔE) and significance data. Using colour gradients, we mapped these results onto the average facial images. Results After treatment, L*a*b* parameters show no statistically relevant colour changes in the vehicle group. In the ‘active’ group, skin was lighter at the upper cheek and, overall, redness decreased. Relevance and significance maps confirmed no visible colour changes in the vehicle group. In the ‘active’ group, the mapping approach revealed colour changes and their location. Skin became lighter below the eye, cheek and forehead. It was less red below the eyes, on the cheek, jawline and forehead, and generally more yellow. Conclusion Our image‐based mapping approach proves to be powerful. It enables us to identify precise facial regions of relevant and statistically significant colour changes after a topical treatment, regions that would have otherwise been undetected. We recently introduced facial colour mapping to visualize differences in skin parameters across the face. Here, we introduce facial colour mapping that enables the visualization of relevance and statistical significance of such differences. |
Databáze: | OpenAIRE |
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