研究生: |
陳俐夙 Li-Su Chen |
---|---|
論文名稱: |
HDRI的特性對虛擬物體照明的影響 The influences of HDRI on the lighting of 3D virtual objects |
指導教授: |
施宣光
Shen-Guan Shih |
口試委員: |
梁容輝
Rung-Huei Liang 楊傳凱 Chuan-Kai Yang |
學位類別: |
碩士 Master |
系所名稱: |
設計學院 - 建築系 Department of Architecture |
論文出版年: | 2009 |
畢業學年度: | 97 |
語文別: | 中文 |
論文頁數: | 60 |
中文關鍵詞: | 曝光值 、高動態範圍影像 、燈光貼圖 、基本影像照明 、Open EXR 、RGBE |
外文關鍵詞: | EV, HDRI, lighting maps, IBL, Open EXR, RGBE |
相關次數: | 點閱:246 下載:0 |
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HDRI (或者HDR) 即High dynamic rage image (高動態範圍影像的縮寫)。HDRI是在相同的場景中結合幾張不同曝光值(EV)的影像,以捕捉真實環境光源為目標,把所有的景物之明暗細節都能記錄在一張影像資訊當中。
而HDRI有許多的應用,其中在3D場景中做為光源效果貼圖,用它來產生材質上的反射和折射環境背影,使虛擬模型有現實生活環境的照明數據;也就是說,一張HDRI圖檔影像就可以對虛擬模型上有真實感的照明。如果是幾張不同曝光值的普通格式影像,對虛擬模型所產生的照明效果,那和一張HDRI影像所產生的效果有什麼相似之處,興起了本研究的比對與測試。
在本研究的測試比對之中可以看出,HDRI當作3D光源貼圖時,它的影像品質會對虛擬物體照明有不同明暗對比的差別。
High dynamic range image (HDRI or HDR) is a set of techniques that integrates images with different Exposure Value (EV) to represent the same scene. The intention of HDRI is to capture the lighting in real scenes, as a consequence of which HDRI is able to record all the details of the real scene in one image information, such as light and darkness.
Moreover, HDRI has been applied to 3D scene to function as lighting maps. HDRI is able to produce the reflection of materials and refraction of background. Therefore, HDRI enables virtual models to be analogous with the illumination data of the real scenes. In other words, one HDRI image can nearly represent real lighting effect on virtual models. The aim of this study is to investigate the differences between the lighting effects represented by several images with different Exposure Value (EV) and the lighting effects represented by HDRI image on virtual model.
The finding of this study indicates that the chiaroscuro of virtual lighting objects is influenced by the quality of 3D mapped lighting image while HDRI is functioning as mapped lighting effects on 3D scene.
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