Usage
  • 69 views
  • 33 downloads

Realtime Free Viewpoint Video System Based on a new Panorama Stitching Framework

  • Author / Creator
    Aziz, Muhammad Usman
  • Free Viewpoint Video and TV is regarded as the future of digital entertainment allowing users to navigate through multiple video streams of an event to select novel viewpoints. This new capability will be able to give to the users the illusion that they are present at the event. In this thesis, we propose a novel framework for real-time video panorama generation. We first present our work for acquiring multiple high-definition video streams using hardware synchronized cameras with GPU accelerated Bayer demosaicing. The multiple streams are then color corrected using camera gain adjustment and Macbeth color checker chart to remove color variations between cameras. Next, we propose an automatic real-time video stitching algorithm using feature matching based approach and automatic camera calibration that is capable of producing spherical panoramas. The algorithm works by splitting the automatic image stitching steps into one-time and recurring computations. We utilize GPUs for accelerating the recurring computations and achieve real-time performance. By effectively caching the repeated transform maps database, we improve the stitching performance by two orders of magnitude compare to CPU implementations. In order to remove seams between the stitching images, we use Vornoi diagram based optimal seam selection algorithm. The stitched video streams are blended together using the first real-time implementation of Laplacian pyramid blending algorithm using multi-GPUs. Finally, we analyze the problems associated with the scalable transmission and rendering of the virtual views using commodity computers and network resources. The multiple stitching steps are pipelined to distribute the panorama stitching computations between multiple processing nodes to produce visually appealing panoramas at 30Hz without any noticeable blurring or stitching artifacts.

  • Subjects / Keywords
  • Graduation date
    2015-11
  • Type of Item
    Thesis
  • Degree
    Master of Science
  • DOI
    https://doi.org/10.7939/R3FX7438Q
  • License
    This thesis is made available by the University of Alberta Libraries with permission of the copyright owner solely for non-commercial purposes. This thesis, or any portion thereof, may not otherwise be copied or reproduced without the written consent of the copyright owner, except to the extent permitted by Canadian copyright law.
  • Language
    English
  • Institution
    University of Alberta
  • Degree level
    Master's
  • Department
    • Department of Computing Science
  • Supervisor / co-supervisor and their department(s)
    • Ray, Nilanjan (Computing Science)
    • Boulanger, Pierre (Computing Science)
  • Examining committee members and their departments
    • Joseph, Dileepan (Electrical and Computer Engineering)