Calibrating pan-tilt cameras in wide-area surveillance networks
ICCV '03 Proceedings of the Ninth IEEE International Conference on Computer Vision - Volume 2
A master-slave system to acquire biometric imagery of humans at distance
IWVS '03 First ACM SIGMM international workshop on Video surveillance
A Performance Evaluation of Local Descriptors
IEEE Transactions on Pattern Analysis and Machine Intelligence
How to Put Probabilities on Homographies
IEEE Transactions on Pattern Analysis and Machine Intelligence
Camera cooperation for achieving visual attention
Machine Vision and Applications
Using Stationary-Dynamic Camera Assemblies for Wide-area Video Surveillance and Selective Attention
CVPR '06 Proceedings of the 2006 IEEE Computer Society Conference on Computer Vision and Pattern Recognition - Volume 1
Pan-tilt-zoom camera calibration and high-resolution mosaic generation
Computer Vision and Image Understanding - Special issue on omnidirectional vision and camera networks
Cooperative Object Tracking with Multiple PTZ Cameras
ICIAP '07 Proceedings of the 14th International Conference on Image Analysis and Processing
Speeded-Up Robust Features (SURF)
Computer Vision and Image Understanding
Machine Vision and Applications
ASIFT: A New Framework for Fully Affine Invariant Image Comparison
SIAM Journal on Imaging Sciences
Fast Keypoint Recognition Using Random Ferns
IEEE Transactions on Pattern Analysis and Machine Intelligence
Camera-to-camera mapping for hybrid pan-tilt-zoom sensors calibration
SCIA'07 Proceedings of the 15th Scandinavian conference on Image analysis
Exploiting distinctive visual landmark maps in pan-tilt-zoom camera networks
Computer Vision and Image Understanding
Towards high-level human activity recognition through computer vision and temporal logic
KI'10 Proceedings of the 33rd annual German conference on Advances in artificial intelligence
Visual object tracking system employing fixed and PTZ cameras
Intelligent Decision Technologies
Cognitive visual tracking and camera control
Computer Vision and Image Understanding
Pedestrian Detection: An Evaluation of the State of the Art
IEEE Transactions on Pattern Analysis and Machine Intelligence
A survey on visual surveillance of object motion and behaviors
IEEE Transactions on Systems, Man, and Cybernetics, Part C: Applications and Reviews
Supporting fuzzy metric temporal logic based situation recognition by mean shift clustering
KI'12 Proceedings of the 35th Annual German conference on Advances in Artificial Intelligence
Accurate single image multi-modal camera pose estimation
ECCV'10 Proceedings of the 11th European conference on Trends and Topics in Computer Vision - Volume Part II
Keeping a Pan-Tilt-Zoom Camera Calibrated
IEEE Transactions on Pattern Analysis and Machine Intelligence
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Master-slave camera systems --- consisting of a wide-angle master camera and an actively controllable pan-tilt-zoom camera --- provide a large field of view, allowing monitoring the full situational context, as well as a narrow field of view, to capture sufficient details. Unconstrained calibration of such a system is a non-trivial task. In this paper a fully automatic and adaptive configuration method is proposed. It learns a motor map relating image coordinates from the master view to motor commands of the slave camera. First, a rough initial configuration is estimated by registering images from the slave camera onto the master view. In order to be operational in poorly textured environments, like hallways, the motor map is online refined by utilizing correspondences originating from moving objects. The accuracy is evaluated in different environments, as well as in the visual and the infrared spectrum. The overall accuracy is significantly improved by the online refinement.