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Proceedings Paper

High-definition television for use in digital endoscopy
Author(s): Juerg Haefliger; Yves Lehareinger; Patrick Blessing; Peter F. Niederer; Daniel Doswald; Norbert Felber
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Paper Abstract

A novel digital high-definition TV (digital HDTV) system is presented which is adapted to the special characteristics of medical endoscopes. In particular, it has a quadratic image aspect ratio to accommodate round endoscopic images, furthermore, the spatial resolution is 1024 x 1024 pixels thereby approaching the diffraction limit of small endoscopes. It exhibits 24 bits true-color with an adjustable temporal resolution of up to 30 full frames per second in progressive scan. To ensure overall superior performance and high-quality image acquisition and reproduction, complex digital error correction and picture enhancing algorithms are integrated into custom ASICs (Application Specific Integrated Circuit). Additionally, an improved color space transformation is performed in real-time to match the spectral characteristics of the digital camera and the viewing device, allowing for a quantitative judgement of colors. Further features include the conversion of the digital video stream to standard video norms such as Pal or NTSC for recording on analog VCRs, the calculation and evaluation of a focus criterion, which is used to perform passive, stable and reliable auto-focusing and the implementation of an automated illumination control, ensuring proper picture brightness during the whole time of operation.

Paper Details

Date Published: 19 January 2001
PDF: 8 pages
Proc. SPIE 4158, Biomonitoring and Endoscopy Technologies, (19 January 2001); doi: 10.1117/12.413786
Show Author Affiliations
Juerg Haefliger, Swiss Federal Institute of Technology Zurich and Univ. of Zurich (Switzerland)
Yves Lehareinger, Swiss Federal Institute of Technology Zurich and Univ. of Zurich (Switzerland)
Patrick Blessing, Swiss Federal Institute of Technology Zurich and Univ. of Zurich (Switzerland)
Peter F. Niederer, Swiss Federal Institute of Technology Zurich and Univ. of Zurich (Switzerland)
Daniel Doswald, Swiss Federal Institute of Technology Zurich (Switzerland)
Norbert Felber, Swiss Federal Institute of Technology Zurich (Switzerland)

Published in SPIE Proceedings Vol. 4158:
Biomonitoring and Endoscopy Technologies
Israel Gannot; Yuri V. Gulyaev; Theodore G. Papazoglou; Christiaan F. P. van Swol, Editor(s)

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