title: Three-dimensional assessment of skin wounds using a standard digital camera.
abstract: In this paper, after an overview of the literature concerning the imaging technologies applied to skin wounds assessment, we present an original approach to build 3-D models of skin wounds from color images. The method can deal with uncalibrated images acquired with a handheld digital camera with free zooming. Compared with the cumbersome imaging systems already proposed, this novel solution uses a low-cost and user-friendly image acquisition device suitable for widespread application in health care centers. However, this method entails the development of a robust image processing chain. An original iterative matching scheme is used to generate a dense estimation of the surface geometry from two widely separated views. The best configuration for taking photographs lies between 15 ( degrees ) and 30 ( degrees ) for the vergency angle. The metric reconstruction of the skin wound is fully automated through self-calibration. From the 3-D model of the skin wound, accurate volumetric measurements are achieved. The accuracy of the inferred 3-D surface is validated by registration to a ground truth and repetitive tests on volume. The global precision around 3% is in accordance with the clinical requirement of 5% for assessing the healing process.
authors.affiliation: Department of Signal and Image Processing of the Ecole Polytechnique and the PRISME Institute of the University of Orleans, 45067 Orleans Cedex, France. sylvie.treuillet@univ-orleans.fr
authors.forename: Sylvie
authors.initials: S
authors.lastname: Treuillet
authors.forename: Benjamin
authors.initials: B
authors.lastname: Albouy
authors.forename: Yves
authors.initials: Y
authors.lastname: Lucas
mesh_terms: D000465:Algorithms; D006801:Humans; D007091:Image Processing, Computer-Assisted / Q000295:instrumentation / Q000379:methods; D008954:Models, Biological; D010781:Photography / Q000379:methods*; D003668:Pressure Ulcer / Q000473:pathology*; D015203:Reproducibility of Results