What is Catadioptric sensor?
A '''catadioptric sensor''' is a visual [[sensor]] that contains [[mirror]]s and [[lens (optics)|lens]]es.<ref>{{cite web |url=http://www.math.drexel.edu/~ahicks/design/what-are.html |title=What are Catadioptric Sensors ? |author=R. Andrew Hicks |publisher=Drexel University, Department of Mathematics |access-date=16 July 2015}}</ref> [[Video camera]]s are limited as to how much they can see in one view. They can lose [[sight]] of what they are recording if something causes them to move suddenly.<ref>{{cite journal |url=http://www.sciencedirect.com/science/article/pii/S0921889004002040 |title=A catadioptric sensor with multiple viewpoints |author=Libor Spacek |journal=Robotics and Autonomous Systems |year=2005 |volume=51 |pages=3–15 |publisher=ScienceDirect, Volume 51, Issue 1, 30 April 2005, Pages 3–15 |doi=10.1016/j.robot.2004.08.009 |access-date=16 July 2015}}</ref> Mirrors can be carefully arranged with lenses to allow the camera lens to see a [[Wide-angle lens|wide angle view]].<ref>{{cite web |url=http://www1.cs.columbia.edu/CAVE/publications/pdfs/Baker_IJCV99.pdf |title=A Theory of Single-Viewpoint Catadioptric Image Formation |author=Simon Baker; Shree K. Nayar |date=1999 |publisher= Kluwer Academic Publishers |access-date=16 July 2015}}</ref> They are often used in [[robot]]ics and in [[List of telescope types#Combined Lens-Mirror Systems|astronomical telescopes]]. One [[example]] is a catadioptric sensor used to inspect the inside of a [[Cylinder|cylindrical]] [[wikt:pipe|pipe]].<ref>{{cite book |chapter-url=https://ieeexplore.ieee.org/document/6164860 |chapter=Using catadioptric sensor to obtain image of the inner surface of a pipe and detection and analysis of faults by image processing |author=M.R. Islam |title=14th International Conference on Computer and Information Technology (ICCIT 2011) |year=2011 |pages=607–610 | display-authors = etal |publisher=Institute of Electrical and Electronics Engineers (IEEE) |doi=10.1109/ICCITechn.2011.6164860 |isbn=978-1-61284-908-9 |s2cid=8648002 |access-date=16 J