NDLI: The energy distribution of the imaging spot in the ultra-wide field-of-view fisheye lens acquisition system

Content Provider	IEEE Xplore Digital Library
Author	Liu, Yueying Tu, Bo Liu, Lu
Copyright Year	2015
Description	Author affiliation: Changan Communication Technology Co., Ltd., Beijing, China (Tu, Bo) \|\| State Key Laboratory of Advanced Optical Communication, Systems and Networks, Peking University, Beijing, China (Liu, Yueying) \|\| State Key Laboratory of Advanced Optical Communication Systems and Networks, Peking University Beijing, China (Liu, Lu)
Abstract	This paper analyzes the energy distribution of the imaging spot in the fisheye lens acquisition system. In the establishment of optical link, a fisheye lens is used to achieve an ultra-wide field-of view (FOV) (about 180 deg), which simplifies the acquisition architecture and reduces the acquisition time. However, the severe barrel distortion of fisheye lenses, which includes the large radial distortion and the small tangential distortion, limits the application of fisheye lenses greatly. In order to calibrate the distortion of fisheye lenses, we proposes a novel inverse polynomial projection model, which is more practical than other projection models. With this model, the incident angle of a light beam can be calculated quickly from the positioning of an imaging spot. In addition, an elliptical spot energy distribution model of the imaging spot is set up based on this projection model. The specific theoretical analyses of the proposed projection model and the energy distribution model are described. Simulation results show that the energy distribution of a Gaussian beam on the charge-coupled device (CCD) turns into an ellipse in the ultra-wide FOV fisheye lens acquisition system, instead of a Gaussian energy distribution. The location of the elliptical spot goes far away from the imaging center, and the eccentricity of the ellipse trajectory enlarges with the increment of the incident angle.
Starting Page	722
Ending Page	726
File Size	383844
Page Count	5
File Format	PDF
e-ISBN	9781467390989
DOI	10.1109/CISP.2015.7407972
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2015-10-14
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Analytical models fisheye lens imaging spot Imaging Optical distortion Distortion Optical fiber communication Laser beams inverse polynomial projection model Lenses elliptical energy distribution model
Content Type	Text
Resource Type	Article

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