Correction of underwater pincushion distortion by a compensating camera lens

Harold R. Suiter

doi:10.1117/12.920292

10 May 2012 Correction of underwater pincushion distortion by a compensating camera lens

Harold R. Suiter

Proceedings Volume 8357, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII; 83571R (2012) https://doi.org/10.1117/12.920292
Event: SPIE Defense, Security, and Sensing, 2012, Baltimore, Maryland, United States

Abstract

When using flat windows between an air medium and one with higher index of refraction, the surface becomes optically active and a number of aberrations are induced. One affecting the optical control of a remotely-piloted underwater vehicle is the apparent pincushion distortion resulting from Snell's law at the interface. Small wide-angle lenses typically have the opposite problem, a barrel distortion caused by limitations in the number of lens surfaces and the constraints of cost. An experimental calibration is described in which the barrel distortion of the lens compensated for most of the inherent pincushion of the change in medium. ZEMAX^TM models will be used to elucidate this phenomenon with a published lens design.* With careful selection of the lens and additional corrector, the resultant image can be made almost rectilinear, thus easing steering control and automatic target recognition.

Citation Download Citation

Harold R. Suiter "Correction of underwater pincushion distortion by a compensating camera lens", Proc. SPIE 8357, Detection and Sensing of Mines, Explosive Objects, and Obscured Targets XVII, 83571R (10 May 2012); https://doi.org/10.1117/12.920292

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