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http://dx.doi.org/10.3807/KJOP.2015.26.2.088

Catadioptric Omnidirectional Optical System Using a Spherical Mirror with a Central Hole and a Plane Mirror for Visible Light  

Seo, Hyeon Jin (Department of Photonics and Sensors, Hannam University)
Jo, Jae Heung (Department of Photonics and Sensors, Hannam University)
Publication Information
Korean Journal of Optics and Photonics / v.26, no.2, 2015 , pp. 88-97 More about this Journal
Abstract
An omnidirectional optical system can be described as a special optical system that images in real time a panoramic image with an azimuthal angle of $360^{\circ}$ and the altitude angle corresponding to the upper and lower fields of view from the horizon line. In this paper, for easy fabrication and compact size, we designed and fabricated a catadioptric omnidirectional optical system consisting of the mirror part of a spherical mirror with a central hole (that is, obscuration), a plane mirror, the imaging lens part of 3 single spherical lenses, and a spherical doublet in the visible light spectrum. We evaluated its image performance by measuring the cut-off spatial frequency using automobile license plates, and the vertical field of view using an ISO 12233 chart. We achieved a catadioptric omnidirectional optical system with vertical field of view from $+53^{\circ}$ to $-17^{\circ}$ and an azimuthal angle of $360^{\circ}$. This optical system cleaniy imaged letters on a car's front license plate at the object distance of 3 meters, which corresponds to a cut-off spatial frequency of 135 lp/mm.
Keywords
Lens design; Omnidirectional lens system; Panoramic vision; Catadioptic imaging system;
Citations & Related Records
Times Cited By KSCI : 1  (Citation Analysis)
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