Susanne Frey

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This paper presents a shape-from-focus method, which is improved with regard to the mathematical operator used for contrast measurement, the selection of the neighborhood size, surface refinement through interpolation, and surface postprocessing. Three-dimensional models of living human faces are presented with such a high resolution that single hairs are(More)
3D models of the skin surface of patients are created by ultra-fast holography and automatic scan matching of synchronously recorded holograms. By recording with a pulsed laser and continuous-wave optical reconstruction of the holographic real image, motion artifacts are eliminated. Focal analysis of the real image yields a surface relief of the patient. To(More)
*Lausanne Institute for Hospitality Research (LIHR), Ecole hôtelière de Lausanne (EHL), Le Chalet-à-Gobet, 1000 Lausanne 25, Switzerland †Competence Center ISnet-VS, University of Applied Sciences Valais, Technopôle 3, 3960 Sierre, Switzerland ‡Hotel Valuation Services HVS, 372 Willis Avenue, Mineola, NY 11501 §University of Western Australia, Faculty of(More)
Hologram tomography is a two-step method for three-dimensional topometry of extended objects. The first step consists of the hologram recording with a single laser pulse of 35 ns duration and storage in a photosensitive material. In the second step the hologram is optically reconstructed and digitized, which leads to a set of two-dimensional projections at(More)
Digital sensors and fast digital image processing facilitate the use of pulsed holography for 3D surface measurement of moving objects. The real image of a hologram is reconstructed optically. A sequence of high-resolution projection images of the real image with a varying distance to the hologram is recorded digitally. Focus detection in this image(More)
AIMS To study the effects of functional magnetic stimulation of the spinal cord in healthy subjects on somatic and autonomic pathways innervating the anal and the external urethral sphincter, bladder, bladder neck, and rectum. METHODS Eight healthy male volunteers gave their written informed consent and underwent functional magnetic stimulation of the(More)
The holographic facial profile scan is a new technique for creation of high-resolution, three-dimensional, realistic facial computer models which can be used for surgical planning and documentation in maxillofacial surgery. First, a holographic image of the patient is recorded using a pulsed laser system. In a second step, called holographic tomography, the(More)
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