臺灣博碩士論文加值系統

本研究設計之透視投影膜片沿用過去已提出分區獨立投影與透視的概念，藉由設計散射微結構與調整穿透區占比，同時兼具投影效果與透視感達到透明顯示的效果以營造擴增實境的情境設計。透過設計微稜鏡結構來傾斜主散射面並搭配超短焦投影機將主散射光導正回正面觀察者的方向，同時也將穿透區鏡面反射形成的投影眩光（Hot spot）往上偏折以避免眩光造成的視覺不適感。接著於稜鏡結構的主散射面上作雷射加工粗糙處理以消除因稜鏡表面平滑而在投影畫面垂直方向上產生的亮線條紋（glare effect），而透過 BRDF 量測可以得知整體的散射特性，也能量化表面加工對亮線條紋的抑制程度，而整體投影畫面的亮度與過去已量產的橢圓陣列微結構相比也得到提升與驗證。最後透過取得傾斜黑白刀口圖來量測 SFR 以得出近似 MTF 的量測結果，比較兩正交方向黑白對比邊緣的模糊程度差異，其差異程度將隨結構的不對稱性增加而影響整體的透視感。

A concept of see-through projection film has been proposed, in which the film has only a part of the area being made diffusive and the majority of the area left clearly transparent as the see-through area. For being used with ultra-short throw projector, a micro prism structure is required to make the majority of the diffusively reflected light propagate toward the viewers and separate the glare reflected from the transparent area of the film away from the major viewing direction. The diffusive surface on the micro prism is made with laser processing to resolve the glare effect, which is a bright line orthogonal to the prism direction. In this paper, the bidirectional reflectance distribution function (BRDF) is used as the index for characterizing the scattering property of the film and glare effect. The evaluation of spatial frequency response (SFR) of digital camera is based on the above slanted-edge method, which suits to MTF calculations for spatially sampled capture devices. This paper investigates the relationship between the transparency of the system and different structure of the films based on the SFR.

摘要 II
ABSTRACT III
誌謝 IV
目錄 V
圖目錄 VII
表目錄 X
第一章 緒論 1
1-1 研究背景 1
1-2 透明顯示技術文獻探討 2
1-2-1 穿透式透明顯示 2
1-2-2 投射式透明顯示 12
1-2-3 透明顯示技術比較 18
1-3 研究目的 19
第二章 相關理論說明 21
2-1 光度學（Photometry） 21
2-2 BRDF（Bidirectional Reflectance Distribution Function） 24
2-3 粗糙度（Roughness） 27
2-4 MTF（Modulation Transfer Function） 31
第三章 設計流程 36
3-1 舊版透視膜片統整 36
3-2 設計架構與規格 37
3-3 架構模擬 39
3-4 亮線現象（glare effect） 40
3-5 表面散射處理 41
3-6 設計成果 42
第四章 研究結果與分析 44
4-1 投影像品質分析 44
4-1-1 粗糙度比較 44
4-1-2 輝度分析 46
4-1-3 BRDF分析 48
4-2 透視像品質分析 57
4-2-1 穿透率、霧度量測 57
4-2-2 SFR量測 59
第五章 結論與未來展望 63
參考文獻 64

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