New Techniques for Production and Application of Object Movies

• Main Authors: Yu-Pao Tsai, 蔡玉寶
• Other Authors: Zen-Cheng Shih
• Format: Others
• Language: en_US
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/92314086076436954258

博士 === 國立交通大學 === 資訊科學與工程研究所 === 95 === 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.