Aligning windows of live video from an imprecise pan-tilt-zoom robotic camera into a remote panoramic display
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A pan-tilt-zoom robotic camera can provide detailed live video of selected areas of interest within a large potential viewing field. To provide spatial context for human observers, it is desirable to insert the resulting live video into a large spherical panoramic display representing the entire viewing field. Accurate alignment of the video stream within the panoramic display is difficult due to small errors in the robot pan-tilt values and image distortion due to nonlinear projection. Existing image alignment algorithms cannot keep up with rapid changes in camera position. In this paper, we present a constant-time image alignment algorithm based on spherical projection and projection-invariant selective sampling that accurately registers paired images at 25 frames per second on a standard PC. Experiments suggest that the new alignment algorithm is faster than previous algorithms by a factor four or more. In a companion paper , we present a new calibration algorithm based on image variance density that optimally estimates camera pan-tilt parameters. ©2006 IEEE.
name of conference
2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006.
Proceedings 2006 IEEE International Conference on Robotics and Automation, 2006. ICRA 2006.
author list (cited authors)
Ni Qin, .., Dezhen Song, .., & Goldberg, K
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