研究目的
To investigate a new method to quantitatively evaluate cosmetics using a multispectral imaging technique and a hyperspectral imager (HSI), focusing on long-lasting foundation.
研究成果
The study demonstrated that hyperspectral imaging can quantitatively evaluate the state of foundation-applied skin using the standard deviation of reflectance, particularly at 800 nm, which is less affected by hemoglobin variations. This method offers a potential improvement over subjective evaluations and could enhance the efficiency of cosmetic testing.
研究不足
Only one type of foundation was evaluated, which may not generalize to other products. The study did not account for variations in skin types or environmental factors beyond controlled conditions. The HSI device may have noise issues at shorter wavelengths (below 500 nm).
1：Experimental Design and Method Selection:
The study used a hyperspectral imager (HSI) to measure skin with and without foundation application, quantifying the state using the standard deviation of reflectance at specific wavelengths. The rationale was to leverage HSI's ability to capture spatial and spectral information simultaneously for objective evaluation.
2：Sample Selection and Data Sources:
10 healthy volunteers (4 males, 6 females, average age 20.9 years) without large pigment lesions were selected. One type of cake-type commercial foundation (beige color) was applied to their cheeks. Data were collected using the HSI.
3：9 years) without large pigment lesions were selected. One type of cake-type commercial foundation (beige color) was applied to their cheeks. Data were collected using the HSI.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: Hyperspectral imager (HSI) with specifications including a 150 W halogen lamp light source, measurement area of 512x512 pixels (6.1x6.1 mm), measurement time about 20 s, area resolution 12.3 μm, wavelength range 400-800 nm, wavelength resolution 2.4 nm. Foundation product (specific brand and model not mentioned).
4：1x1 mm), measurement time about 20 s, area resolution 3 μm, wavelength range 400-800 nm, wavelength resolution 4 nm. Foundation product (specific brand and model not mentioned).
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: Volunteers' cheeks were measured with HSI after cleansing, immediately after foundation application, and every 2 hours up to 6 hours. The same area was measured by aligning a mark on the cheek with the measurement hole. Data processing excluded noise pixels (reflectance >1) and analyzed 492x492 pixels.
5：Data Analysis Methods:
Standard deviation of reflectance at wavelengths from 500 to 800 nm (10 nm increments) was calculated. Student's t-test was used for statistical analysis with a significance level of 5%.
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