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MVA
2002
9 years 11 months ago
Enhancing Character Recognition by Optimizing Focal Length
This paper proposes to use zooming function of digital cameras for robust character recognition and to control focal length for improving the performance even in dim light conditi...
Takahiko Shimmura, Yoshinao Shiraki, Naoki Mukawa,...
CVIU
2004
122views more  CVIU 2004»
9 years 11 months ago
Depth distortion under calibration uncertainty
There have been relatively little works to shed light on the effects of errors in the intrinsic parameters on motion estimation and scene reconstruction. Given that the estimation...
Loong Fah Cheong, Chin-Hwee Peh
IJCV
2006
218views more  IJCV 2006»
9 years 11 months ago
Stabilizing the Focal Length Computation for 3-D Reconstruction from Two Uncalibrated Views
In order to reconstruct 3-D shape from two uncalibrated views, one needs to resolve two problems: (i) the computed focal lengths can be imaginary; (ii) the computation fails for fi...
Ken-ichi Kanatani, Atsutada Nakatsuji, Yasuyuki Su...
ICRA
1995
IEEE
124views Robotics» more  ICRA 1995»
10 years 3 months ago
Active Camera Calibration Using Pan, Tilt and Roll
—Three dimensional vision applications, such as robot vision, require modeling of the relationship between the two-dimensional images and the three-dimensional world. Camera cali...
Anup Basu, Kavita Ravi
ECCV
2000
Springer
10 years 3 months ago
Can We Calibrate a Camera Using an Image of a Flat, Textureless Lambertian Surface?
Abstract. In this paper, we show that it is possible to calibrate a camera using just a flat, textureless Lambertian surface and constant illumination. This is done using the effec...
Sing Bing Kang, Richard S. Weiss
CVPR
2007
IEEE
10 years 3 months ago
Minimal Solutions for Panoramic Stitching
This paper presents minimal solutions for the geometric parameters of a camera rotating about its optical centre. In particular we present new 2 and 3 point solutions for the homo...
Matthew Brown, Richard I. Hartley, David Nist&eacu...
CAIP
1999
Springer
125views Image Analysis» more  CAIP 1999»
10 years 4 months ago
Calibration Update Technique for a Zoom Lens
A technique for a zoom lens camera is presented that enable to update continuously camera intrinsic parameters while zooming. This is based on the fact that the spatial angle subte...
Marina Kolesnik
ICCV
2003
IEEE
10 years 5 months ago
Information Theoretic Focal Length Selection for Real-Time Active 3-D Object Tracking
Active object tracking, for example, in surveillance tasks, becomes more and more important these days. Besides the tracking algorithms themselves methodologies have to be develop...
Joachim Denzler, Matthias Zobel, Heinrich Niemann
ICIAR
2004
Springer
10 years 5 months ago
Camera Calibration Using Two Concentric Circles
We present a simple calibration method for computing the extrinsic parameters (pose) and intrinsic parameters (focal length and principal point) of a camera by imaging a pattern of...
Francisco Abad, Emilio Camahort, Roberto Viv&oacut...
AVSS
2007
IEEE
10 years 6 months ago
Accurate self-calibration of two cameras by observations of a moving person on a ground plane
A calibration algorithm of two cameras using observations of a moving person is presented. Similar methods have been proposed for self-calibration with a single camera, but intern...
Tsuhan Chen, Alberto Del Bimbo, Federico Pernici, ...
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