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2. Endoscopic image pre-processing
2.1 Barrel distortion
Endoscopists generally observe the tissue surface very closely, to benefit from very good image resolution. The distal tip of endoscopes is located at a distance ranging from one to several centimetres from the tissue under observation. This distance of observation requires wide-angle (wide-field) optics to ensure a minimum field of view of the order of a few square centimetres. Wide-field optics require short focal lengths, leading to "barrel" distortions.
Figure 2 a represents a grid that is acquired with a distortion-free camera. The coordinate point (C x...
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Endoscopic image pre-processing
Endoscopic image registration
Bibliography
Software tools
Free, general-purpose mosaic software (not specifically dedicated to endoscopic scenes). For Windows (2007 version) http://www.01net.com
Free barrel distortion correction software http://www.archeograph.com
Websites
Dickson Tong, Hong Kong University of Science and Technology, Description of the general principles of image mosaic in a general application context http://home.cse.ust.hk
Patents
3D Reconstruction and Registration of Endoscopic Data. US20170046833A1. US Application (pending).
Directory
Manufacturers – Suppliers – Distributors (non-exhaustive list)
Manufacturers of medical endoscopes (non-exhaustive list)
Karl Storz, Tuttlingen https://www.karlstorz.com/fr/
Fujinon France, Saint Quentin en Yvelines Cedex https://www.fujifilm.eu
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