傅楸善臺灣大學：資訊工程學研究所陳坤毅Chen, Kun-YiKun-YiChen2007-11-262018-07-052007-11-262018-07-052006http://ntur.lib.ntu.edu.tw//handle/246246/53707在真實的世界裡，景色的亮度差異是非常大的。我們人眼可以同時觀察到很暗及很亮的影像，也就是人眼能適應較大的亮度差異；然而，現在的相機因為裝置結構上的限制，因此無法取得較大的動態範圍影像。所以我們的研究致力於如何取得高動態範圍的影像。 有學者提出利用不同曝光時間來重建出高動態範圍影像的方法。因此我們延伸他們的方法，提出了如何選擇曝光比較好的照片來建立高動態影像的照片。我們的方法主要是量測影像的曝光亮度，然後決定這張照片是否適合我們。使用我們的方法除了能減少時間來重建取得高動態範圍影像外，我們還能保留原來景象的色彩鮮豔度而不失真。In real world, the dynamic range is quite high. Human visual system can accommodate high dynamic range, but digital camera can not acquire high dynamic range image due to limitation of its capture device. Consequently, modern research aims to get high dynamic range image. Debevec and Malik proposed a method to reconstruct a high dynamic range image by using different exposure images. Therefore, we propose a method to choose better exposure images. Our method measures exposure of the images, and choose proper exposure images. And then we use the images we choose to construct a high dynamic range. Using our method can either use less time to acquire a high dynamic range image or preserve color saturation of the scene.Chapter 1 Introduction 1 1.1 Dynamic Range 1 1.2 High Dynamic Range (HDR) 2 1.3 Storing HDR Images 5 1.3.1 48-bit TIFF Format 5 1.3.2 Pixar 33-bit Log TIFF Format 6 1.3.3 Radiance 32-bit RGBE Format 7 1.3.4 SGI LogLUV 32-bit TIFF Format 8 1.3.5 ILM OpenEXR 48-bit EXR Format 10 1.3.6 High Dynamic Range Image Format Conclusion 10 1.4 Exposure 11 1.4.1 Shutter Speed 12 1.4.2 Aperture Diameter 13 1.4.3 ISO Speed 13 1.4.4 Exposure Value 14 Chapter 2 Generating HDR Images 16 2.1 Using HDR Sensor Technology 16 2.1.1 Fujifilm SuperCCD SR 16 2.1.2 Spatially Varying Exposure 20 2.2 Using Series of Images With Multiple Exposure 21 2.2.1 Image Acquisition Pipeline 22 2.2.2 Recovering Response Curve 23 2.2.3 Constructing the High Dynamic Range Radiance Map 26 Chapter 3 Exposure Metering 28 3.1 Motivation 28 3.2 Analyze Saturation 29 3.3 Choose Better Exposure Images 32 Chapter 4 Experiment and Results 40 4.1 Experiment 40 4.2 Results 41 Chapter 5 Conclusion and Future Work 50 5.1 Conclusion 50 5.2 Future Work 513027483 bytesapplication/pdfen-US曝光相機高動態範圍影像exposurehigh dynamic rangecamerathesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/53707/1/ntu-95-R93922063-1.pdf