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研究生:羅子軒
研究生(外文):Tzu-Hsuan Lo
論文名稱:用於三維重建之雙向立體視覺介面
論文名稱(外文):A Bi-directional Visual Stereo Interface for 3-D Reconstruction
指導教授:石勝文石勝文引用關係
指導教授(外文):Sheng-Wen Shih
學位類別:碩士
校院名稱:國立暨南國際大學
系所名稱:資訊工程學系
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2002
畢業學年度:90
語文別:中文
論文頁數:52
中文關鍵詞:立體視覺人機介面視線追蹤立體對應點三維重建
外文關鍵詞:Stereo VisionMan-machine InterfaceGaze TrackingEye TrackingStereo Correspondence3-D Reconstruction
相關次數:
  • 被引用被引用:3
  • 點閱點閱:730
  • 評分評分:
  • 下載下載:201
  • 收藏至我的研究室書目清單書目收藏:0
如何忠實的呈現三維物件的樣貌,一直是電腦視覺領域的重要研究領域之一。人類可以毫不費力地找出影像中的立體對應點,但是卻無法精確的定位出其三維座標。另一方面,當給定正確的立體對應關係與校正參數後,機器視覺系統可以輕易的定位出立體對應點的三維座標,但是目前尚無強健且有效率的立體對應點演算法。因為互動式三維重建系統結合了人類與機器視覺系統的長處,可以由操作者導引電腦系統獲得正確的立體對應關係,產生精確的三維重建結果。因此目前也有許多研究機構投入互動式三維重建系統的研究工作中。只是目前以文書處理為主的人機介面,並不適用於互動式三維重建系統。因此在本研究中,我們著手發展雙向立體視覺介面,這套介面包含了雙眼視線追蹤系統與立體顯示設備,雙眼視線追蹤系統由雙眼瞳孔追蹤系統與頭部位置追蹤系統所組成。我們發展瞳孔中心位置強健估測法,以每秒處理30對瞳孔影像的速度,追蹤操作者瞳孔中心的位置。配合頭部位置追蹤系統提供的頭部位置資訊,動態計算出相對應的雙眼三維立體視線。透過立體設備顯示立體影像,由操作者凝視其中的立體對應點,雙眼視線追蹤系統紀錄影像中由操作者辨識出的立體對應關係,提供互動式三維重建系統所需要的資訊。實驗結果顯示這套雙向立體視覺介面在實際應用上非常具有發展的潛力。
Reconstruction of the 3-D shape of an object with high fidelity using stereo vision is always an important research topic in the field of computer vision. Human can effortlessly match the stereo correspondences of a point but are not skilful to accurately determine the 3-D coordinates of the point. On the other hand, a machine vision system can easily determine the 3-D coordinates of a point given correct stereo correspondences and the calibration parameters, but there is no efficient algorithm for determining stereo correspondences robustly. Because an interactive 3-D reconstruction system possesses both the merits of the human vision and the machine vision, stereo correspondences can be robustly estimated under the guidance of the operator yielding accurate 3-D reconstruction results. Therefore, lots of research groups have focused on developing interactive 3-D reconstruction system. However, the current human-computer interface is designed for word processing and 2-D graphics, thus is not suitable for interactive 3-D reconstruction. In this thesis, a bi-directional visual stereo interface for accessing the stereo matching results from a human brain is proposed. The stereo interface consists of a binocular gaze tracking system and a stereo display. The binocular gaze tracker comprises a binocular pupil tracker and a head tracker. A robust algorithm is developed to extract the pupil centers of user’s eyes in video rate (30 Hz). The estimated pupil positions plus the estimated head position can be used to provide 3-D lines of sight of user’s both eyes. While the operator stares at a point shown on the stereo display, the binocular gaze tracker records the stereo correspondences for guiding the interactive system to reconstruct 3-D information contained in the stereo images. Experimental results show that the proposed interface is very promising.
1. 簡介-10
2. 雙向立體視覺介面系統硬體架構與軟體流程-16
3. 瞳孔影像追蹤法-21
3.1 瞳孔中心快速定位法-21
3.2 瞳孔中心位置強健估測法-23
4. 系統校正
4.1 座標系定義-27
4.2 系統校正方法-28
4.2.1 Screen Coordinate System(SCS)校正-28
4.2.2 建立WCS與SCS間的對應關係-29
4.2.3 透過MCS建立HCS與SCS間的對應關係-30
4.2.4 由HCS動態決定GCS-31
4.2.5 建立瞳孔中心座標與三維視線對應關係-32
5. 雙向立體視覺介面操作流程-35
6. 實驗結果及討論-37
6.1 系統校正結果-37
6.2 實驗題材-37
6.3 文字實驗結果-41
6.4 圖形實驗結果-43
6.5 edge模糊程度實驗結果-45
6.6 立體場景實驗結果-47
6.7 實驗結果分析-49
7. 結論與未來展望-51
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