标题: | 环物影片产生及应用技术之研究 New Techniques for Production and Application of Object Movies |
作者: | 蔡玉宝 Yu-Pao Tsai 施仁忠 洪一平 Zen-Cheng Shih Yi-Ping Hung 资讯科学与工程研究所 |
关键字: | 环影影片;校正;背景去除;三维重建;立体;object movie;calibration;background removal;3D reconstruction;stereo |
公开日期: | 2006 |
摘要: | 由于环物影片(Object Movies)在建置上相当简单以及能产生相片品质的成像结果,因此环物影片目前已是一种非常通用的方法来表现可互动的三维物体。虽然环物影片已成功地被应用在不同的领域,但关于产生高品质环物影片的技术以及更具有开创性应用的技术都有待研究开发。 本论文提出一些方法来产生高品质的环物影片以及展示一些利用环物影片来表现三维物体的应用。首先,我们提出一个环物影片拍摄架的挍正方法并提供一个视觉化的界面帮助使用者根据计算结果来调整拍摄架。实验显示利用此校正方法,只需取得12张校正物的影像便可以得到任一视角的精确相机参数。接着,我们提出环物影片背景去除的方法。该方法最主要的好处是使用者的介入非常地少。更确切地说使用者只需从自动去背景后的影像中选择足够好的结果,该方法便能自动地将这些正确的资讯传递到其它的影像并修正去背结果。在传递的过程中,该方法利用选择的影像重建该三维物体的三维几何形状,再投影到其它的影像上产生物体的剪影以协助自动去背方法产生更好的去背结果。实验显示,透体这剪影资讯可以明显地降低去背结果的误差并能有效地抵抗杂讯的影响。另外,一个新的三维重建方法被提出来从环物影片之中重建出该物体的三维资讯。相较之前的方法,该方法所产生的三维模型可以保留住更多的细节部份而且其剪影会和原始输入的剪影影像相吻合。最后,我们延续之前环场环物整合技术的研究,提出可将立体环物整合到立体环场的方法。使用者可以透过所提供的系统可以整合立体环场环物建置出一个非常逼真的互动环境,并可直接浏览该虚拟环境以及观看立体环物。经由这样的互动环境使用者可以透过立体视觉体验到更真实的3D感受。 Object movie (OM) is a conventional approach for modeling and rendering interactive 3D objects because of its simplicity in production and its photorealistic presentation of objects. Although OMs have been successfully adopted in many applications, the techniques for production and application of OMs must still be enhanced if high-quality and efficient OMs are desired. This work proposes some methods for generating high quality OMs, and demonstrates some applications using generated OMs to present the 3D objects. First, a method for calibrating the motorized object rig is presented, and a visual tool is introduced to adjust the axes of the motorized object rig. The distances among all the three axes of the motorized object rig can be minimized after adjustment, and more reliable camera parameters can be obtained after the calibration process. Experimental results indicate that highly accurate parameters can be obtained from only 12 images. Second, an image segmentation method is proposed to remove the backgrounds of OMs. The major advantage of the proposed method is it can propagate the successful segmentation results from some selected images to the whole OM. The new OM segmentation method extracts a 2D shape from the reconstructed 3D model and uses the 2D shape to remove the background from the foreground object. This work demonstrates that the proposed method can significantly improve OM segmentation. Third, a novel approach is proposed to reconstruct high quality 3D models from OMs. The silhouettes and detail features of reconstructed 3D model are successfully preserved. Finally, previous work on augmented panoramas is extended to augmented stereo panoramas. This work develops an interactive system that allows the user to integrate stereo OMs into a stereo panorama, and interactively browses the augmented stereo panorama. To generate stereo OMs, the 3D models reconstructed from monocular OMs are rendered. The proposed method takes less than half of the processing time, including acquisition and segmentation, than traditional approaches, which take two separate sets of OMs. The proposed interactive system provides the users with two approaches to determine the reference frames where the object is inserted in a stereo panorama. The left view and the right view are rendered separately after determining the reference frames. For each view, the background layer is first rendered, followed by the shadow and the object layers. A user can directly rotate and translate the stereo object movie of interest by browsing the augmented panorama. The augmented stereo panoramas provide users with more persuasive interaction with better depth perception. |
URI: | http://140.113.39.130/cdrfb3/record/nctu/#GT009023806 http://hdl.handle.net/11536/82480 |
显示于类别: | Thesis |
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