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2 February 2006 3D measurement of human face by stereophotogrammetry
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Proceedings Volume 6026, ICO20: Biomedical Optics; 60261E (2006)
Event: ICO20:Optical Devices and Instruments, 2005, Changchun, China
The following article describes a stereophotogrammetry based technique for 3D measurement of human faces. The method was developed for function orientated diagnostics and therapy in dentistry to provide prognoses for jaw-growth or surgical procedures. The main aim of our activities was to realize both -- a rapid measurement and a dense point cloud. The setup consists of two digital cameras in a convergent arrangement and a digital projector. During the measurement a rapid sequence of about 20 statistical generated patterns were projected onto the face and synchronously captured by the two cameras. Therefore, every single pixel of the two cameras is encoded by a characteristically stack of intensity values. To find corresponding points into the image sequences a correlation technique is used. At least, the 3D reconstruction is done by triangulation. The advantages of the shown method are the possible short measurement time (< 1 second) and - in comparison to gray code and phase shift techniques - the low quality requirements of the projection unit. At present the reached accuracy is +/- 0.1mm (rms), which is sufficient for medical applications. But the demonstrated method is not restricted to evaluate the shape of human faces. Also technical objects could be measured.
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Holger Wagner, Axel Wiegmann, Richard Kowarschik, and Friedrich Zöllner "3D measurement of human face by stereophotogrammetry", Proc. SPIE 6026, ICO20: Biomedical Optics, 60261E (2 February 2006);

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