「Real-time Video Mosaicing using Non-rigid Registration」
2014年度論文賞受賞者の紹介
Real-time Video Mosaicing using Non-rigid Registration
［IPSJ Transactions on Computer Vision and Applications Vol.4 pp.170-178］
［論文概要］
This paper presents a real-time mosaicing method that generates a seamless panorama image by stitching video key-frames as soon as they are detected. There are four main contributions: (1) we propose a “fast” key-frame selection procedure based on the distribution of feature descriptors; (2) we register key-frame images by using a non-rigid deformation model in order to “smoothly” stitch images; (3) we add a new constraint to the model in order to create mosaics with natural appearance; (4) we propose a fast image stitching algorithm modeled as a minimum graph cut problem, applied to mesh triangles instead of pixels. The performance of the proposed method is validated by experiments in non-controlled conditions and by comparison with a state-of-the-art method.
［推薦理由］
本論文は非剛体位置合わせ手法を用いた動画像からの連結画像生成を，実時間でしかも画像が追加されるたびに実行可能な新しい手法を提案するものである．提案手法は要素技術を非常に詳細に検討してデザインされたものであり，そのアルゴリズムや方法論は非常に良く考えられた練られたものとなっている．2012年当時のPCでも実時間実行が可能であり，非常に高い有効性・実用性を備えた方法となっている．コンピュータビジョン分野に画期的なブレークスルーをもたらすといったような斬新さは小さいが，非常にしっかりとした方法論が提示されており，その貢献は極めて大きいと評価できる．全体を構成する各ステップのそれぞれについても，新規なアイデアを包含しており，その貢献は高く評価できる．このように，本論文は学術的にも新しい視点でしっかりした理論展開を示しており，検証実験も十分になされていることから，受賞論文に相応しいものである．
Rafael Henrique Castanheira de Souza
received, in 2006 and 2008, his BS and MS in Computer Science from the State University of Campinas, Brazil. In 2014 he received a Ph.D. degree for his research on non-rigid registration from Tokyo Institute of Technology. He currently works at DMP Ltd., developing computer vision projects.
Masatoshi Okutomi
received a B.Eng. degree from the University of Tokyo, in 1981 and an M.Eng. degree from Tokyo Institute of Technology, in 1983. He joined Canon Research Center, Canon Inc. in 1983. From 1987 to 1990, he was a visiting research scientist at Carnegie Mellon University. In 1993, he received a D.Eng. degree from Tokyo Institute of Technology. Since 1994, he has been with Tokyo Institute of Technology, where he is currently a professor in the Department of Mechanical and Control Engineering, the Graduate School of Science and Engineering.
Akihiko Torii
received a Master degree and a. Ph.D. degree from Chiba University in 2003 and 2006, respectively. He then spent four years as a post-doctoral researcher at Czech Technical University in Prague. Since 2010, he is an assistant professor at the Department of Mechanical and Control Engineering, the Graduate School of Science and Engineering, Tokyo Institute of Technology.