Projects

  1. summary image

    Spatio-Temporal Alignment of Non-Overlapping Sequences from Independently Panning Cameras

    Seyed Morteza Safdarnejad, Xiaoming Liu

    We tackle a novel scenario of spatio-temporal alignment of seuqences referred to as Nonoverlapping Sequences (NOS). NOS are captured by multiple freely panning handheld cameras whose field of views (FOV) might have no direct spatial overlap. With the popularity of mobile sensors, NOS rise when multiple cooperative users capture a ...

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    Keywords: Sequence Alignment, Motion Compensation

  2. summary image

    Temporally Robust Global Motion Compensation by Keypoint-based Congealing

    Seyed Morteza Safdarnejad, Yousef Atoum, Xiaoming Liu

    Global motion compensation (GMC) removes the impact of camera motion and creates a video in which the background appears static over the progression of time. Various vision problems, such as human activity recognition, background reconstruction, and multi-object tracking can benefit from GMC. Existing GMC algorithms rely on sequentially processing consecutive ...

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    Keywords: Motion Compensation, Joint Alignment, Activity Recognition

  3. summary image

    Robust Global Motion Compensation in Presence of Predominant Foreground

    Seyed Morteza Safdarnejad, Xiaoming Liu, Lalita Udpa

    Global motion compensation (GMC) removes intentional and unwanted camera motion. GMC is widely applicable for video stitching and, as a pre-processing module, for motion-based video analysis. While state-of-the-art GMC algorithms generally estimate homography satisfactorily between consecutive frames, their performances deteriorate on real-world unconstrained videos, for instance, videos with predominant foreground ...

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    Keywords: Motion Compensation, Activity Recognition

  4. summary image

    Sports Videos in the Wild (SVW): A Video Dataset for Sports Analysis

    Seyed Morteza Safdarnejad, Xiaoming Liu, Lalita Udpa, Brooks Andrus, John Wood, Dean Craven

    The amount of digital videos being created is increasing exponentially, e.g., YouTube has reached the upload rate of 100 hours of video per minute. A great deal of this growth is due to the tremendous popularity of smartphones and ubiquitous Internet access. This means that amateur-user generated videos form ...

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    Keywords: Database, Activity Recognition

Publications

2017

  • Spatio-temporal Alignment of Non-overlapping Sequences from Independently Panning Cameras
    Seyed Morteza Safdarnejad, Xiaoming Liu
    In Proceeding of IEEE Computer Vision and Pattern Recognition (CVPR 2017), Honolulu, HI, Jul. 2017
    Bibtex | PDF | Project Webpage
  • @inproceedings{ spatio-temporal-alignment-of-non-overlapping-sequences-from-independently-panning-cameras,
      author = { Seyed Morteza Safdarnejad and Xiaoming Liu },
      title = { Spatio-temporal Alignment of Non-overlapping Sequences from Independently Panning Cameras },
      booktitle = { In Proceeding of IEEE Computer Vision and Pattern Recognition },
      address = { Honolulu, HI },
      month = { July },
      year = { 2017 },
    }

2016

  • Temporally Robust Global Motion Compensation by Keypoint-based Congealing
    Seyed Morteza Safdarnejad, Yousef Atoum, Xiaoming Liu
    Proc. European Conference on Computer Vision (ECCV 2016), Amsterdam, The Netherlands, Oct. 2016
    Bibtex | PDF | Project Webpage
  • @inproceedings{ temporally-robust-global-motion-compensation-by-keypoint-based-congealing,
      author = { Seyed Morteza Safdarnejad and Yousef Atoum and Xiaoming Liu },
      title = { Temporally Robust Global Motion Compensation by Keypoint-based Congealing },
      booktitle = { Proc. European Conference on Computer Vision },
      address = { Amsterdam, The Netherlands },
      month = { October },
      year = { 2016 },
    }

2015

  • Robust Global Motion Compensation in Presence of Predominant Foreground
    Seyed Morteza Safdarnejad, Xiaoming Liu, Lalita Udpa
    Proc. British Machine Vision Conference (BMVC 2015), Swansea, UK, Sep. 2015 (Acceptance rate 33%, Best Poster Award)
    Bibtex | PDF | Project Webpage
  • @inproceedings{ robust-global-motion-compensation-in-presence-of-predominant-foreground,
      author = { Seyed Morteza Safdarnejad and Xiaoming Liu and Lalita Udpa },
      title = { Robust Global Motion Compensation in Presence of Predominant Foreground },
      booktitle = { Proc. British Machine Vision Conference },
      address = { Swansea, UK },
      month = { September },
      year = { 2015 },
    }
  • Sports Videos in the Wild (SVW): A Video Dataset for Sports Analysis
    Seyed Morteza Safdarnejad, Xiaoming Liu, Lalita Udpa, Brooks Andrus, John Wood, Dean Craven
    Proc. International Conference on Automatic Face and Gesture Recognition (FG 2015), Ljubljana, Slovenia, May. 2015 (Acceptance rate 84/221 = 38%)
    Bibtex | PDF | Project Webpage
  • @inproceedings{ sports-videos-in-the-wild-svw-a-video-dataset-for-sports-analysis,
      author = { Seyed Morteza Safdarnejad and Xiaoming Liu and Lalita Udpa and Brooks Andrus and John Wood and Dean Craven },
      title = { Sports Videos in the Wild (SVW): A Video Dataset for Sports Analysis },
      booktitle = { Proc. International Conference on Automatic Face and Gesture Recognition },
      address = { Ljubljana, Slovenia },
      month = { May },
      year = { 2015 },
    }

2014

  • Genre Categorization of Amateur Sports Videos in the Wild
    Seyed Morteza Safdarnejad, Xiaoming Liu, Lalita Udpa
    Proc. International Conference on Image Processing (ICIP 2014), Paris, France, Oct. 2014
    Bibtex | PDF
  • @inproceedings{ genre-categorization-of-amateur-sports-videos-in-the-wild,
      author = { Seyed Morteza Safdarnejad and Xiaoming Liu and Lalita Udpa },
      title = { Genre Categorization of Amateur Sports Videos in the Wild },
      booktitle = { Proc. International Conference on Image Processing },
      address = { Paris, France },
      month = { October },
      year = { 2014 },
    }