projective techniques 中文意思是什麼
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This thesis concentrate on the research of the techniques and algorithms of scenes rendering based on photographs, according to the projective geometry framework in computer vision
本論文主要從計算機視覺的幾何理論出發，研究基於真實場景照片的繪制技術及實用演算法。主要研究內容和成果如下。 -
Due to its high outputting luminance, large screen and the high quality of the projective image, the projection display for large screen has been used in many fields, such as official business work, conferences, etc. liquid crystal projection display, for example, one of the most important micro - display techniques, has shown the tendency for substituting the crt projection display in the conventional video display field
大屏幕投影顯示以它的高亮度、大面積、高質量的顯示圖像，已逐步成為現代顯示技術的主流，廣泛應用於辦公、會議、家庭影院等領域。以液晶投影顯示技術為例，目前這項技術以及得到了廣泛應用，而且正在逐步取代傳統的crt顯示技術。 -
For bilateral symmetry objects, the techniques on symmetry - point detection and symmetry - axis extraction are presented based on harmonic conjugation relationship. for rotated symmetry objects, the techniques on rotated units description and rotated symmetry center extraction are presented based on center invariants of objects. further more, by using 3d invariants and 2d projective transformation, an approach to recover shape from part symmetry objects is realized on some conditions
（ 3 ）深入分析了2d對稱性目標透視成像的幾何特點，將共點四線交比用於目標輪廓上的關鍵點的特性描述中；利用調和共軛關系，提出了一種針對左右對稱型目標的對稱點檢測和對稱軸提取的演算法；利用交比關系構造了目標的形心不變量，提出了一種針對旋轉對稱型目標的旋轉對稱單元判定、旋轉中心提取的演算法；進一步利用3d不變量和2d射影變換，實現了一定條件下的對稱性目標的形狀恢復技術。
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