指紋認証と「FIDO」について

A PANORAMIC VIDEO SYTEM BY DIRECT MANIPULATION VIDEO NAVIGATION Chi-Cheng Ju, Ding-Yun Chen, Chen-Tsai Ho, Chung-Hung Tsai Multimedia Development Div., Mediatek Inc. No. 1, Dusing Rd. 1, Hsinchu Science Park, Hsinchu, Taiwan {cc.ju, dynamic.chen, ct.ho, ch.tsai}@mediatek.com ABSTRACT This paper presents a panoramic video system by direct manipulation video navigation without any image stitching. Our panoramic video browsing is interacted with user by displaying overlapped region of consecutive input video frames with corresponding viewing angle. That is, when user slides, the panoramic video will switch video frames to corresponding viewing angle according to sliding distance. When user stops to slide, the video will display the overlapped region of consecutive video frames in the same viewing angle. The switching of viewing angle and cropping of the overlapped region are based on video frame registration. The major advantage of our method is to provide a panoramic video navigation from hand-held mobile camera phone with low computation and high quality. Comparing to other panoramic video stitching approaches, our method can guarantee no ghosting and no distortion. Our demo video is in http://youtu.be/XYpPAdypIuI for detail. Index Terms—panoramic video, video navigation 1. INTRODUCTION Panoramic video system provides video representation from a selected viewing angle, and produces more strong sense of immersion comparing to static panoramic image. The techniques of creating panoramic image are mature and have been commercialized, but not in panoramic video, even the approximate sense of panoramic video. Traditional methods to create panoramic video use specialized optical devices [6], such as fisheye or reflective mirror, or use multiple cameras [7][8]. However, the special devices are expensive and may restrict the video resolution. Recent researches focus on stitching approaches to create panoramic video. Agarwala et al. [9], Ray-Acha et al. [10] and Yang et al. [11] apply graph-cut optimization to stitch a single panning video into an infinite wide field video, like a video texture [12] extension to wide-field viewing angle. However, the stitching method cannot be perfect without any artifact for scenes with complex moving objects. Another approaches [13][14] stitches static background and put the moving foreground on it. However, the approach is based on segmentation, which is still an open, difficult problem now. Directly interacting with video content allows providing users with a fulfilling sense of control the video scenes. The timeline slider can control the video playback in time domain, and the direct manipulation of video content can control the video playback in spatial domain. To provide object-centric spatial manipulation, Kimber et al. [1], Dragicevic et al. [2] and Karrer et al. [3][4] apply object tracking techniques to support direct manipulation video navigation. Shah et al. [5] estimate the scene background and represent the object motion using 3-D space-time trajectories to support object-centric manipulation in wide- field background mosaics. Those previous works are focused on foreground objects manipulation. In this paper, we propose an interaction technique to direct manipulation with background of the video scenes. That is, our method can interactively show an input video in panoramic video style from direct manipulation the video. The behavior of control the video scenes is the same as the navigation of a panoramic video. The paper proposes an interaction technique with approximate sense of panoramic video by direct manipulation video navigation. This method provides a solution that panoramic video can create by simple hand- held camera, such as using smart phone or tablet. The main idea of our method is to produce illusions of browsing a panoramic video when user interaction with the video content. That is, when user slides on the video content, the video playback will show video frames with corresponding viewing angle according to sliding distance. Different with object-centric spatial manipulation [2][3], the panoramic video uses background-centric spatial manipulation, so each video frame has only one motion trajectory for background movement. When user stops to slide, the video playback will repeat show a group of video frames, and the video frames are cropped in the same spatially overlapped region to keep all the shown video frames are in the same viewing angle. The idea is similar to the video stabilization when stopping slide the panoramic video. Our panoramic video system can be divided into two stages: video preprocessing stage and panoramic video

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指紋認証と「FIDO」について