しわの非接触3-D測定システムの関発とその応用

抄録

The skin surface is characterized by small ridges, prominences and furrows that change with aging and degree of sun expose. Quantifying such geometric characteristics as the ridges and furrows on the skin surface can provide cosmetic researchers with a means of assessing changes in wrinkles and understanding the wrinkling process.
Many attempts have been tried to analyze the features of wrinkles in order to evaluate the efficacy of anti-wrinkles preparations. However, measurement systems proposed up to now have been unable to provide 3-D information about wrinkle shapes. The authors have developed a new non-contact 3-D measurement system to profile wrinkles based on a fringe scanning method using a sinusoidal grating pattern instead of interference fringes generated by laser. The grating projection system makes it possible to capture the three-dimensional nature of the objective. Another feature of the new device is that fringe scanning is introduced to the grating projection system. The system provides a greater density of measurement points and eliminates the influence of skin surface anomalies such as spots, freckles, moles, etc. Using this system, the depth of wrinkles can be obtained within 1.0 second with a depth accuracy of less than ±14μm over an area of 12.5mm×15mm.
3-D measurements of wrinkles were taken on the external corners of the eyes of 599 Japanese women ranging in age from 20 to 67. A mathematical model is proposed which aims to assist in understanding the effects of aging and the efficacy of cosmetic products.