title: A device for the color measurement and detection of spots on the skin.
abstract: OBJECTIVE
  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.
  
  
  METHODS
  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.
  
  
  RESULTS
  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.
  
  
  CONCLUSIONS
  In this work, we present a new system that may be very useful in order to measure the color and to detect spots of the skin. Its portability and easy applicability will be very useful in dermatologic and cosmetic studies.
authors.affiliation: Centre for Sensors, Instruments and Systems Development (CD6), Department of Optics and Optometry, Technical University of Catalonia (UPC), Terrassa, Spain. pladellorens@oo.upc.edu
authors.forename: Josep
authors.initials: J
authors.lastname: Pladellorens
authors.forename: Agustí
authors.initials: A
authors.lastname: Pintó
authors.forename: Jordi
authors.initials: J
authors.lastname: Segura
authors.forename: Cristina
authors.initials: C
authors.lastname: Cadevall
authors.forename: Joan
authors.initials: J
authors.lastname: Antó
authors.forename: Jaume
authors.initials: J
authors.lastname: Pujol
authors.forename: Meritxell
authors.initials: M
authors.lastname: Vilaseca
authors.forename: Joaquín
authors.initials: J
authors.lastname: Coll
mesh_terms: D000465:Algorithms; D003124:Colorimetry / Q000379:methods*; D006801:Humans; D007089:Image Enhancement / Q000379:methods*; D007090:Image Interpretation, Computer-Assisted / Q000379:methods*; D008029:Lighting / Q000379:methods; D010781:Photography / Q000379:methods; D012867:Skin / Q000473:pathology; D012871:Skin Diseases / Q000175:diagnosis*; D012880:Skin Pigmentation; D012984:Software; D013053:Spectrophotometry