scholarly journals Lens Distortion Rectification Using Triangulation Based Interpolation

2015 ◽  
pp. 35-44 ◽  
Author(s):  
Burak Benligiray ◽  
Cihan Topal
Keyword(s):  
Lens Distortion ◽  
Distortion Rectification

Camera Calibration Method Based on Circle Plane Board

2013 ◽  
Vol 475-476 ◽  
pp. 184-187
Author(s):  
Wen Guo Li ◽  
Shao Jun Duan
Keyword(s):  
Camera Calibration ◽  
Calibration Method ◽  
Lens Distortion ◽  
Edge Extraction ◽  
Circle Plane ◽  
Circle Centre ◽  
Extraction Algorithm ◽  
Calibration Algorithm ◽  
Characteristic Points ◽  
Distortion Parameters

We present a camera calibration method based on circle plane board. The centres of circles on plane are regarded as the characteristic points, which are used to implement camera calibration. The proposed calibration is more accurate than many previous calibration algorithm because of the merit of the coordinate of circle centre being obtained from thousand of of edge pionts of ellipse, which is very reliable to image noise caused by edge extraction algorithm. Experiments shows the proposed algorithm can obtain high precise inner parameters, and lens distortion parameters.

Study on Mechanical Properties of the Composite Materials Film by Speckle Projection Method

2012 ◽  
Vol 496 ◽  
pp. 281-284
Author(s):  
Wen Wen Liu ◽  
Zhi Wang ◽  
Yun Hai Du ◽  
Xian Zhong Xu ◽  
Da Quan Liu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Composite Material ◽  
Composite Materials ◽  
Projection Method ◽  
Dynamic Deformation ◽  
Calibration Method ◽  
Deformation Measurement ◽  
Lens Distortion

An improved accurate speckle projection method is used for study the mechanical properties of the composite material film in the paper. A system for deformation measurement is developed with the telecentric lenses, in which such conventional lens’ disadvantages such as lens distortion and perspective error will be diminished. Experiments are performed to validate the availability and reliability of the calibration method. The system can also be used to measure the dynamic deformation and then results are also given.

scholarly journals A practical method to detect and correct for lens distortion in the TEM

2006 ◽  
Vol 106 (2) ◽  
pp. 66-74 ◽  
Author(s):  
Gian Carlo Capitani ◽  
Peter Oleynikov ◽  
Sven Hovmöller ◽  
Marcello Mellini
Keyword(s):  
Practical Method ◽  
Lens Distortion

Fisheye Lens Distortion Calibration Based on the Lens Charactetic Curves

2014 ◽  
Vol 519-520 ◽  
pp. 636-639
Author(s):  
Bao Long Zhang ◽  
Shao Jing Zhang ◽  
Wei Qi Ding ◽  
Hui Shuang Shi
Keyword(s):  
Optical System ◽  
Characteristic Curve ◽  
Calibration Method ◽  
Lens Distortion ◽  
Wide Angle ◽  
Forming Process ◽  
Fisheye Lens ◽  
Large Scope ◽  
Wide Angle Lens ◽  
Barrel Distortion

The fisheye lens is a kind of ultra wide angle lens, which can produce a big super-wide-angle lens distortion. In order to cover a large scope of light, barrel distortion is artificially added to the optical system. However, in some cases this distortion is not allowed, then it requires calibrations of those distortions. Most of the traditional distortion calibration method uses target plane calibration to do it. This paper discusses the way of design fisheye lens, through which we can know the forming process of distortion clearly. Based on this paper, a simple and effective calibration method can be understood. Different from common camera calibration method, the proposed calibration method can avoid the error occurring in the process of calibrating test, that directly use the lens’ characteristic curve. Through multiple sets of experimental verifications, this method is effective and feasible.

scholarly journals Lens distortion correction with a calibration harp

2011 ◽  
Author(s):  
R. Grompone von Gioi ◽  
P. Monasse ◽  
J.-M. Morel ◽  
Z. Tang
Keyword(s):  
Distortion Correction ◽  
Lens Distortion

Memory-efficient algorithm for lens distortion compensation

2003 ◽  
Vol 95 (1) ◽  
pp. 139-141
Author(s):  
K. D. Kozmin ◽  
K. Hyyppä
Keyword(s):  
Efficient Algorithm ◽  
Lens Distortion ◽  
Distortion Compensation ◽  
Memory Efficient

Non-metric lens distortion correction using modified particle swarm optimisation

2014 ◽  
Vol 21 (3) ◽  
pp. 330 ◽  
Author(s):  
Tianfei Chen ◽  
Yang Wang ◽  
Defeng Wu ◽  
Xiang Wu ◽  
Zi Ma
Keyword(s):  
Particle Swarm ◽  
Distortion Correction ◽  
Particle Swarm Optimisation ◽  
Lens Distortion

scholarly journals Assessing UAV platform types and optical sensor specifications

2014 ◽  
Vol II-5 ◽  
pp. 17-24 ◽  
Author(s):  
B. Altena ◽  
T. Goedemé
Keyword(s):  
Unmanned Aerial Vehicles ◽  
Chromatic Aberration ◽  
Image Motion ◽  
Lens Distortion ◽  
Mobile Platforms ◽  
Optical Instruments ◽  
Slow Moving ◽  
Processing Software ◽  
Normal Lens

Photogrammetric acquisition with unmanned aerial vehicles (UAV) has grown extensively over the last couple of years. Such mobile platforms and their processing software have matured, resulting in a market which offers off-the-shelf mapping solutions to surveying companies and geospatial enterprises. Different approaches in platform type and optical instruments exist, though its resulting products have similar specifications. To demonstrate differences in acquisitioning practice, a case study over an open mine was flown with two different off-the-shelf UAVs (a fixed-wing and a multi-rotor). The resulting imagery is analyzed to clarify the differences in collection quality. We look at image settings, and stress the fact of photographic experience if manual setting are applied. For mapping production it might be safest to set the camera on automatic. Furthermore, we try to estimate if blur is present due to image motion. A subtle trend seems to be present, for the fast flying platform though its extent is of similar order to the slow moving one. It shows both systems operate at their limits. Finally, the lens distortion is assessed with special attention to chromatic aberration. Here we see that through calibration such aberrations could be present, however detecting this phenomena directly on imagery is not straightforward. For such effects a normal lens is sufficient, though a better lens and collimator does give significant improvement.

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