28 December 2000 Area tracking in topographical in-vivo measurement series of human skin by displacement vector fields
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Abstract
In the first part of the presented paper a new measurement system for fast three-dimensional in vivo measurement of the microtopography of human skin is proposed. It is based on the principle of active image triangulation. A Digital Micromirror Device (DMDTM) is used for projecting sinusoidal intensity distributions on the surface of human skin. By using temporal phase shift algorithms the three-dimensional topography is reconstructed from two-dimensional images. Displacement vector fields represent a promising approach for detecting deformation and other lateral changes in the surface of human skin. In the second part of the presented paper a method based on local template matching and smooth interpolation algorithms for determining a displacement vector field is proposed. Aiming at a minimal expenditure of numerical calculation, a stepwise algorithm was developed for this purpose. The deformatory component of the calculated vector field is separated by minimizing a suitable functional, which is also presented in the paper. In investigations of measurement series the proposed method proves to be very efficient. The calculated displacement vector fields connect corresponding areas in two subsequent measurements. Distortions caused by mechanical deformation or other influences can be detected and visualized by the separated deformatory components of the vector fields.
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Hermann Hopermann, Hermann Hopermann, Reinhart A. Lunderstaedt, Reinhart A. Lunderstaedt, "Area tracking in topographical in-vivo measurement series of human skin by displacement vector fields", Proc. SPIE 4115, Applications of Digital Image Processing XXIII, (28 December 2000); doi: 10.1117/12.411553; https://doi.org/10.1117/12.411553
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