Ms. Dina P. Sari Profile

Dina P. Sari

at Institute of Technology Bandung

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Proceedings Article | 11 April 2019 Paper

Measurement of skin wrinkles differences using novel optical skin imaging system of digital fringes profilometry

Dina Sari, E. Juliastuti, V. Nadhira

Proceedings Volume 11044, 1104406 (2019) https://doi.org/10.1117/12.2503421

KEYWORDS: Skin, Cameras, Imaging systems, Projection systems, Digital Light Processing, Tissue optics, 3D modeling, Image processing, Nonlinear filtering, Phase shift keying

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Wrinkle is one of skin properties used to indicate aging or environment damage in human body. This feature can be assessed through contact and non-contact methods. Dermatology industry often utilizes tools such as dermatoscopy, however it lacks the ability to yield wrinkle's depth and requires contact with skin, which are not preferable because possibility of deforming skin's natural texture. These lead to the development of digital fringe profilometry which utilize phase-shifted fringes being projected to the skin. This method can satisfy both wrinkle's depth and non-invasive measurement.

A novel system of digital fringe profilometry technique is presented, which used newly improved camera technology preferred by the dermatological industry and a projector, both are commercially available, with new configuration suitable for skin measurement. The system is configured with certain height and angle to respectively project fringes and obtain images. Images will later be processed using phase shifting interferometry (PSI) and global phase unwrapping. The processing system will produce wrapped phase and absolute phase value. In order to prove system's feasibility, experiment was done by sampling two areas from three fingers. Quantitative analysis was done through statistical paired T-Test to see the system ability to acknowledge significant difference of two groups' skin topographic condition. Based on the T-Test, P value that was obtained is 0.003915, which concluded that the system is capable of quantifying two different skin topographic conditions and provide significantly different results.

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