Results 251 to 260 of about 121,669 (297)

Calibration of Pan-Tilt-Zoom (PTZ) Cameras and Omni-Directional Cameras

2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05), 2005
In the first part we discuss the problem of recovering the calibration of a network of pan-tilt-zoom cameras. The intrinsic parameters of each camera over its full range of zoom settings are estimated through a two step procedure. We first determine the intrinsic parameters at the camera's lowest zoom setting very accurately by capturing an extended ...
S. Thirthala, S.N. Sinha, M. Pollefeys
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Estimating Camera Tilt from Motion without Tracking

2017 14th Conference on Computer and Robot Vision (CRV), 2017
Most methods for automatic estimation of external camera parameters (e.g., tilt angle) from deployed cameras are based on vanishing points. This requires that specific static scene features, e.g., sets of parallel lines, be present and reliably detected, and this is not always possible.
Nada Elassal, James H. Elder
openaire   +1 more source

Practical self-calibration of pan-tilt cameras

IEE Proceedings - Vision, Image, and Signal Processing, 2001
The authors propose a practical self-calibration method of rotating and zooming cameras. The problem with previous methods occurs when the camera motion is almost fully zoomed with very little rotation, which is called the `near-degenerate' configuration. In that case, the solutions become unstable and rotation angles cannot be calculated.
Kim, H, Hong, KS
openaire   +2 more sources

Stereoscopic System with the Tight Tilted Cameras

Applied Mechanics and Materials, 2013
Thispaper describes a stereoscopic camera system based on a pair of separate cameras.The cameras are stationary and tilted together. The value of their tiltingangle is derived in regards to their maximal possible utilization of the chiparea with the minimalizing unused parts. It can increase the size of the croppedimage of both left and right images as
Petr Novac, Vladimír Mostýn, Tomáš Kot, Václav Krys   +3 more
openaire   +1 more source

Real Time Target Tracking with Pan Tilt Zoom Camera

2009 Digital Image Computing: Techniques and Applications, 2009
We present an approach for real-time tracking of a non-rigid target with a moving pan-tilt-zoom (PTZ) camera. The tracking of the object and control of the camera is handled by one computer in real time. The main contribution of the paper is method for target representation, localisation and detection, which takes into account both foreground and ...
Pankaj Kumar, Anthony Dick, Tan Soo Sheng   +2 more
openaire   +2 more sources

Probabilistic certification of pan-tilt-zoom camera surveillance systems

IEEE Conference on Decision and Control and European Control Conference, 2011
In this work a method to evaluate the performance of autonomous patrolling systems is introduced based on stochastic reachability with random sets. We consider set-valued models with stochastic dynamics for multiple pan-tilt-zoom (PTZ) cameras acting as pursuers and a single evader. The problem of maximizing the probability that the evader successfully
RAIMONDO, DAVIDE MARTINO, N. Kariotoglou, S. Summers, J. Lygeros   +3 more
openaire   +2 more sources

Reliability-based camera handoff for cooperative tracking with multiple pan-tilt cameras

International Journal of Control, Automation and Systems, 2013
We present a new handoff method for multiple pan-tilt cameras for mobile robot tracking in an indoor environment. Camera handoff is an important step to consistently maintain the visibility of a mobile robot with maximized object tracking accuracy. First, we propose a method to estimate the position of a mobile robot using single pan-tilt camera. Then,
Kyung H. Jeong, Jeong S. Choi, Beom H. Lee   +2 more
openaire   +1 more source

Image-based pan-tilt camera control in a multi-camera surveillance environment

2003 International Conference on Multimedia and Expo. ICME '03. Proceedings (Cat. No.03TH8698), 2003
In automated surveillance systems with multiple cameras, the system must be able to position the cameras accurately. Each camera must be able to pan-tilt such that an object detected in the scene is in a vantage position in the camera's image plane and subsequently capture images of that object. Typically, camera calibration is required.
null Ser-Nam Lim, A. Elgammal, L.S. Davis   +2 more
openaire   +1 more source

VLC Positioning Using Cameras with Unknown Tilting Angles

GLOBECOM 2017 - 2017 IEEE Global Communications Conference, 2017
Prior visible-light communication (VLC) positioning systems require the receiver to be placed towards a certain angle, or extra sensors like gyroscopes must be equipped to estimate the angle of the receiver. In this work, we propose a positioning scheme using cameras based on angle difference of arrival (ADOA).
Bingcheng Zhu, Julian Cheng, Jun Yan, Jinyuan Wang, Yongjin Wang   +4 more
openaire   +1 more source

Calibrating Pan-Tilt Cameras with Telephoto Lenses

2007
Pan-tilt cameras are widely used in surveillance networks. These cameras are often equipped with telephoto lenses to capture objects at a distance. Such a camera makes full-metric calibration more difficult since the projection with a telephoto lens is close to orthographic.
Xinyu Huang, Jizhou Gao, Ruigang Yang
openaire   +1 more source