U. Pavlovcic, "Laser Triangulation System for the Measurement of Volume and Color of Wounds", in Proc. of 2nd Int. Conf. on 3D Body Scanning Technologies, Lugano, Switzerland, 2011, pp. 10-15, http://dx.doi.org/10.15221/11.010.
Laser Triangulation System for the Measurement of Volume and Color of Wounds
Urban PAVLOVCIC, Matija JEZERSEK, Janez MOZINA
Faculty of Mechanical Engineering, University of Ljubljana, Ljubljana, Slovenia
A compact and portable rotational laser profilometer was developed for accurate measurement of the volume and color of wounds. The measuring system is based on the principle of laser-line triangulation and rotary motion along the measuring surface. The result is a 3D shape of an object, in color. The system is calibrated by measuring the surface of a reference object. The standard deviation of differences between the reference surface and the measurement was 0.4 mm after calculation of transformation parameters. The measuring range is 150x150x200 mm. The developed software is used for data acquisition and analysis. It is a tool for semi-automatic wound edge determination based on color variations using NURBS surface for the virtual healthy skin approximation. Once the wound edge is determined based on the color information, only the partial volumes within the wound boundaries are considered. In this way accuracy is significantly improved. The algorithm for automatic determination of the area of virtual healthy skin is based on the previously found wound edge. The results on the measurements of in-vivo wounds indicate that the repeatability is mostly dependent on the determination of the virtual healthy skin. By using this novel approach the relative error of the calculated volume was reduced under 10%.
3D measurement, surface digitalization, profilometry, laser triangulation, image processing, wound shape
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