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  • 學位論文

使用曝光量測完成高動態範圍影像

High Dynamic Range Images Using Exposure Metering

指導教授 : 傅楸善

摘要


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。

關鍵字

曝光 相機 高動態範圍影像

並列摘要


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.

並列關鍵字

exposure high dynamic range camera

參考文獻


[1]S. Battiato, A. Castorina and M.Mancuso, “High Dynamic Range Imaging for Digital Still Camera: an Overview,” Journal of Electronic Imaging, Vol. 12, No. 3, pp. 459-469, 2003.
[4]P. E. Debevec and J. Malik, “Recovering High Dynamic Range Radiance Maps from Photographs,” Proceeding of ACM SIGGRAPH, Los Angeles, pp. 369-378, 1997.
[8]R. C. Gonzalez and R. E. Woods, Digital Image Processing, 2nd Ed., Prentice-Hall, Upper Saddle River, New Jersey, 2002.
[9]Industrial Light and Magic, “OpenEXR,” http://www.openexr.com/, 2006.
[12]G. W. Larson, “LogLuv Encoding for Full-Gamut, High-Dynamic Range Images,” Journal of Graphics Tools, Vol. 3, No. 1, pp. 15-31, 1998.

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