A General and Simple Method for Camera Pose and Focal Length Determination

2014 ◽  
Author(s):  
Yinqiang Zheng ◽  
Shigeki Sugimoto ◽  
Imari Sato ◽  
Masatoshi Okutomi
Keyword(s):  
Focal Length ◽  
Simple Method ◽  
Camera Pose ◽  
Length Determination

scholarly journals Near-field diffraction-based focal length determination technique

2017 ◽  
Vol 92 ◽  
pp. 105-109 ◽  
Author(s):  
Francisco Jose Torcal-Milla ◽  
Luis Miguel Sanchez-Brea
Keyword(s):  
Focal Length ◽  
Near Field ◽  
Length Determination

Focal Length Determination of Raman Immersion Ball Probes in Diverse Media

2009 ◽  
Vol 63 (3) ◽  
pp. 378-380 ◽  
Author(s):  
Henk-Jan Van Manen ◽  
Rob Bloemenkamp ◽  
Oscar F. Van Den Brink
Keyword(s):  
Focal Length ◽  
Length Determination

scholarly journals Focal length determination for the 60cm telescope at Astronomical station Vidojevica

2012 ◽  
pp. 97-104 ◽  
Author(s):  
Z. Cvetkovic ◽  
G. Damljanovic ◽  
R. Pavlovic ◽  
O. Vince ◽  
I.S. Milic ◽  
...  
Keyword(s):  
Focal Length ◽  
Ccd Camera ◽  
Angular Separation ◽  
Multiple Stars ◽  
Relative Coordinates ◽  
Double And Multiple Stars ◽  
Positional Angle ◽  
Length Determination ◽  
Optical Wavelengths ◽  
Astronomical Station

The focal length of a telescope is an important parameter in determining the angular pixel size. This parameter is used for the purpose of determining the relative coordinates (angular separation and positional angle) of double and multiple stars, and the precise coordinates of extragalactic radio sources (ERS) that are visible at optical wavelengths. At the Astronomical Station Vidojevica we have collected observations of these objects using two CCD cameras, Apogee Alta U42 and SBIG ST-10ME, attached to the 60 cm telescope. Its nominal focal length is 600 cm as given by the manufacturer. To determine the telescope focal length more precisely for both attached detectors, we used angular-separation measurements from CCD images taken at Astronomical Station Vidojevica. The obtained focal lengths are: F42 = (5989 ? 7) mm using the CCD camera Apogee Alta U42 attached to the telescope, and F10 = (5972 ? 4) mm with the CCD camera SBIG ST-10ME attached to the telescope.

Simple method for manufacturing and optical characterization of tapered optical fibres

2016 ◽  
Vol 24 (4) ◽  
Author(s):  
A. Zakrzewski ◽  
A. Pięta ◽  
S. Patela
Keyword(s):  
Focal Length ◽  
Fdtd Method ◽  
Single Mode ◽  
Photonic Devices ◽  
Optical Fibres ◽  
Simple Method ◽  
Spot Diameter ◽  
Small Spot ◽  
Edge Method

AbstractPhotonic devices often use light delivered by a single-mode telecommunication fibre. However, as the diameter of the core of the optical fibre is of 10 microns, and the transverse dimensions of the photonic waveguides are usually micrometer or less, there is an issue of incompatibility. The problem may be solved by application of tapered optical fibres. For efficient light coupling, the taper should be prepared so as to create a beam of long focal length and small spot diameter in the focus. The article describes the design, fabrication and characterization of tapered optical fibres prepared with a fibre-optic fusion splicer. We modelled the tapers with FDTD method, for estimation of the influence of the tapered length and angle on the spot diameter and the focal length of an outgoing beam. We fabricated tapers from a standard single mode fibre by the Ericsson 995 PMfi- bre-optic fusion splicer. We planned the splicing technology so as to get the needed features of the beam. We planned a multistep fusion process, with optimized fusion current and fusion time. The experimental measurements of best tapered optical fibres were carried out by the knife-edge method.

scholarly journals Exhaustive Linearization for Robust Camera Pose and Focal Length Estimation

2013 ◽  
Vol 35 (10) ◽  
pp. 2387-2400 ◽  
Author(s):  
A. Penate-Sanchez ◽  
J. Andrade-Cetto ◽  
F. Moreno-Noguer
Keyword(s):  
Focal Length ◽  
Length Estimation ◽  
Camera Pose ◽  
Focal Length Estimation

scholarly journals STUDY OF THE METHOD FOR FOCAL LENGTH DETERMINATION IN DIGITAL CAMERAS

2020 ◽  
Vol 4 ◽  
pp. 145-154
Author(s):  
Volodymyr Hlotov ◽  
◽  
Alla Hunina ◽  
Keyword(s):  
Focal Length ◽  
Digital Cameras ◽  
Length Determination
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