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Aligning windows of live video from an imprecise pan-tilt-zoom camera into a remote panoramic display for remote nature observation

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Abstract

A pan-tilt-zoom (PTZ) robotic camera can provide a detailed live video of selected areas of interest within a large potential viewing field. The selective coverage is ideal for nature observation applications where power and bandwidth are often limited. To provide the spatial context for human observers, it is desirable to insert the 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 imprecise pan-tilt values and rapid changes in camera configurations. Common image alignment algorithms are computationally expensive for real time applications. We are interested in designing algorithms that fit low power computation platform and hence can be implemented inside the PTZ camera in the future. We present a sampling-based constant-time image alignment algorithm based on spherical projection and projection-invariant selective sampling that accurately registers paired images at 100 frames per second on a simulated embedded platform. The alignment accuracy actually is better than existing methods when high rotational difference is involved. Experiments suggest that the new alignment algorithm is faster than existing algorithms by 1,471.6 times when aligning a six-mega-pixel image pair.

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Acknowledgments

Thanks to J. Zhang for his help in implementing part of the algorithms. Thanks are given to H. Lee, C. Kim, and Z. Bing for their contributions to NetBot Laboratory, Department of Computer Science and Engineering, Texas A&M University. Thanks to K. Goldberg, J. Yi, D. Volz, R. Gutierrez-Osuna, and V. Taylor for insightful discussions and feedback.

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Authors and Affiliations

  1. Computer Science and Engineering Department, Texas A&M University, College Station, TX, 77843, USA

    Dezhen Song, Yiliang Xu & Ni Qin

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  1. Dezhen Song
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  2. Yiliang Xu
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  3. Ni Qin
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Corresponding author

Correspondence to Dezhen Song.

Additional information

This work was supported in part by Panasonic Inc., by Microsoft Inc., and by the National Science Foundation under IIS-0534848 and IIS-0643298.

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Song, D., Xu, Y. & Qin, N. Aligning windows of live video from an imprecise pan-tilt-zoom camera into a remote panoramic display for remote nature observation. J Real-Time Image Proc 5, 57–70 (2010). https://doi.org/10.1007/s11554-009-0127-z

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  • DOI: https://doi.org/10.1007/s11554-009-0127-z

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