1 December 1991 Endoscopic inspection using a panoramic annular lens
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Abstract
Endoscopy is a technique for imaging the inner part of a volume or cavity. Such techniques have applications in many areas, such as medicine, civil engineering, and aerospace; indeed, anywhere tubes and pipes are involved. The present paper discusses a method of endoscopy which utilizes a unique panoramic annular lens to obtain a flat two-dimensional annular image of the 360 degree surround of the optical system. Although the distortions involved in the optical mapping to produce such an image are not very severe, and the images can be interpreted by inspection, computer algorithms are introduced to linearize the images so as to simplify their interpretation.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Donald R. Matthys, John A. Gilbert, Joseph T. Puliparambil, "Endoscopic inspection using a panoramic annular lens", Proc. SPIE 1554, Second International Conference on Photomechanics and Speckle Metrology, (1 December 1991); doi: 10.1117/12.57466; https://doi.org/10.1117/12.57466
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