Results 261 to 270 of about 104,369 (305)
Some of the next articles are maybe not open access.
Are camera, projector, and camera–projector calibrations different?
Applied Optics, 2023Structured light projection systems have become a referent in three-dimensional optical metrology. Calibration of the cameras and projectors of these systems is one of the most critical procedures to achieve high-accuracy measurements. However, the calibration process requires some clarifications for adequate experimental implementation.
Rigoberto Juarez-Salazar +2 more
openaire +2 more sources
Calibration of Smooth Camera Models
IEEE Transactions on Pattern Analysis and Machine Intelligence, 2013Generic imaging models can be used to represent any camera. Current generic models are discrete and define a mapping between each pixel in the image and a straight line in 3D space. This paper presents a modification of the generic camera model that allows the simplification of the calibration procedure.
Pedro Miraldo, Helder Araújo
openaire +2 more sources
2000
This article deals with optical laws that must be considered when using underwater cameras. Both theoretical and experimental point of views are described, and it is shown that relationships between air and water calibration can be found.
Jean-Marc Lavest +2 more
openaire +1 more source
This article deals with optical laws that must be considered when using underwater cameras. Both theoretical and experimental point of views are described, and it is shown that relationships between air and water calibration can be found.
Jean-Marc Lavest +2 more
openaire +1 more source
Camera calibration with genetic algorithms
Proceedings 2001 ICRA. IEEE International Conference on Robotics and Automation (Cat. No.01CH37164), 2001We present a novel approach based on genetic algorithms for performing camera calibration. Contrary to the classical nonlinear photogrammetric approach, the proposed technique can correctly find the near-optimal solution without the need of initial guesses (with only very loose parameter bounds) and with a minimum number of control points (7 points ...
Qiang Ji, Yongmian Zhang
openaire +1 more source
On the sensitivity of camera calibration
Image and Vision Computing, 1993Abstract The orientation position errors of an object's coordinate frame are determined when the offset of image centre and lens distortion are not included in the calibration process. The orientation and position errors are [( u 0 ) 2 + ( v 0 ) 2 ] 0.5 / f and [( u 2 0 + v 2 0 ) T 2 z + ( u 2 0 T 2 z + v 2 0 T y 2 )] 0.5
openaire +1 more source
Self-calibration of an affine camera
1995This paper introduces the 3 intrinsic parameters that the affine camera can have at most. The intrinsic parameters of the affine camera are closely related to the usual intrinsic parameters of the pinhole perspective camera, but different in general case. Based on the invariance of the intrinsic parameters, the methods of self-calibration of the affine
Quan, Long, Mohr, Roger
openaire +1 more source
Extrinsic calibration of a camera and laser range finder (improves camera calibration)
2004 IEEE/RSJ International Conference on Intelligent Robots and Systems (IROS) (IEEE Cat. No.04CH37566), 2005We describe theoretical and experimental results for the extrinsic calibration of sensor platform consisting of a camera and a 2D laser range finder. The calibration is based on observing a planar checkerboard pattern and solving for constraints between the "views" of a planar checkerboard calibration pattern from a camera and laser range finder.
Qilong Zhang, Robert Pless
openaire +1 more source
Segment based camera calibration
Journal of Computer Science and Technology, 1993The basic idea of calibrating a camera system in previous approaches is to determine camera parameters by using a set of known 3D points as calibration reference. In this paper, we present a method of camera calibration in which camera parameters are determined by a set of 3D lines.
Songde Ma, Guo-Qing Wei, Jinfeng Huang
openaire +1 more source
Calibrating a mobile camera's parameters
Pattern Recognition, 1993Abstract The calibration of the relative rotation and translation between a camera and a mobile robot's coordinate systems is addressed, as well as the camera's intrinsic parameters, from a sequence of monocular images and robot movements. Existing hand/eye calibration procedures for robot arms are not directly applicable because they require the ...
Yuh-Lin Chang +2 more
openaire +1 more source
Refining PTZ camera calibration
2008 19th International Conference on Pattern Recognition, 2008Due to the increased need for security and surveillance, PTZ cameras are now being widely used in many domains. Therefore, it is very important for the applications like video mosaic generation or automatic surveillance that these camera be accurately calibrated. In this paper, we address the problem of parameter refinement for such pan-tilt-zoom (PTZ)
Junejo, Imran N., Foroosh, Hassan
openaire +2 more sources