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Optical metrology

A device for the color measurement and detection of spots on the skin

Optical metrology
R&D Engineering Manager, Ph.D. in Physics at Sensofar Medical | Other articles

In 2003 Agustí was awarded a Fulbright scholarship to carry out research on phasing of large segmented telescopes at the University of California, Irvine.
His research interests include optical metrology and phasing of large segmented telescopes and confer the Sensofar R&D group an outstanding position to always stay up-to-date in terms of innovation and the highest technological level.

A device for the color measurement and detection of spots on the skin full article
J. Pladellorens1, A. Pintó1, J. Segura1, C. Cadevall1, J. Antó1, J. Pujol1, M. Vilaseca and J. Coll1
1Center for Sensors, Instruments and Systems Development (CD6), Universitat Politècnica de Catalunya (UPC) Rambla Sant Nebridi, 10, E-08222 Terrassa, Spain.

Skin Research & Technology, Volume14, Issue1 February 2008 Pages 65-70


In this work, we present a new and fast easy‐to‐use device that allows the measurement of color and the detection of spots on the human skin. The developed device is highly practical for relatively untrained operators and uses inexpensive consumer equipment, such as a CCD color camera, a light source composed of LEDs and a laptop. The knowledge of the color of the skin and the detection of spots can be useful in several areas such as in dermatology applications, the cosmetics industry, the biometrics field, health care, etc.

In order to perform these measurements the system takes a picture of the skin. After that, the operator selects the region of the skin to be analyzed on the displayed image and the system provides the CIELAB color coordinates, the chroma and the ITA parameter (Individual Tipology Angle), allowing the comparison with other reference images by means of CIELAB color differences. The system also detects spots, such as freckles, age spots, sunspots, pimples, black heads, etc., in a determined region, allowing the objective measurement of their size and area.

The colorimetric information provided by a conventional spectrophotometer for the tested samples and the computed values obtained with the new developed system are quite similar, meaning that the developed system can be used to perform color measurements with relatively high accuracy. On the other hand, the feasibility of the system in order to detect and measure spots on the human skin has also been checked over a great amount of images, obtaining results with high precision.


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Measurement of thick and thin filmsMeasurement of aspherical and freeform optics