Skin Mapping 2

Function 

Contractor for Medical Univ. Graz, Inst. for Dermatology 

Contact Information

Description

Dermatological assessment of localization and extent of skin involvement is often a pre-requisite for therapy planning and therapeutic effects evaluation. Topodermatographic Image Analysis systems use only 2D information for mole mapping which dos not allow precise 3D measurements. Photogrammetry can reconstruct surfaces in the 3D space from multiple 2D image data.

For this purpose, a stereoscopic prototype system was created that uses two or more digital consumer cameras. Structured projected light is used for the stereo reconstruction of the skin surface, and patient-pose invariant light for the actual skin texture. The patient is rotated on a motorized turntable for a full coverage of the trunk. Dense stereo matching results in a point cloud overlaid with texture from the skin. After merging the results of different views a full textured reconstruction of the patient's trunk is available as digital surface model (DSM) projected on a near-elliptical shape. Visualization is done by triangulation that generates a VRML2.0 file (3D and high resolution texture). The system has been realized as a low-cost solution covering the principle requirements of 3D documentation in dermatology.

It is an operational tool for image data management, visualization, measurement on the unwrapped surface, and 3D data export.

Project Duration

2002 - 2003 

Main Partners

• University of Graz Department of Dermatology   http://www.meduni-graz.at/dermatologie/
• DIBIT Messtechnik GmbH   http://dibit.itz.cc/

Funding

• University of Graz Department of Dermatology

Figure 1: Skin Mapping Hardware Setup 

Figure 2: Skin Mapping Hardware Description

Figure 3: Skin surface, unwrapped to cylindrical model 

Figure 4: Rendered 3D Model

Figure 4: Rendered 3D Model, Detail

Videos

• Skin Mapping Demo

Presentation

• Presentation at Advanced Computer Vision  

References

Paar, G and Smolle, J (2003).
Stereoscopic Skin Mapping for Dermatology
In: CEUR - Bildverarbeitung für die Medizin, Springer, Erlangen, Germany, March 9-11, 2003, vol. 80, pp. 211-215.

Paar, G and Smolle, J (2003).
Photogrammetric Body Scanning for Dermatology
In: 6th ISPRS Conference on Optical 3-D Measurement Techniques, September 22-26, Zurich, Switzerland.

Paar, G, Smolle, J, and Sidla, O (2002).
Skin Mapping Using Low-Cost Stereo Vision
In: Application in Dermatology. Proc. Numerisation 3D Human Modelling, April 24-25, 2002, Paris, pp. 766.