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研究生:曾苡禎
研究生(外文):Yi-Chen Tseng
論文名稱:基於梯度相關性之高動態範圍色調映射
論文名稱(外文):High Dynamic Range Image Tone Mapping Based on Gradient Correlation
指導教授:蔡吉昌蔡吉昌引用關係
指導教授(外文):Jyi-Chang Tsai
學位類別:碩士
校院名稱:義守大學
系所名稱:資訊管理學系
學門:電算機學門
學類:電算機一般學類
論文種類:學術論文
論文出版年:2016
畢業學年度:104
語文別:中文
論文頁數:70
中文關鍵詞:高動態範圍影像色調映射像素梯度全多格演算法
外文關鍵詞:High dynamic range imageTone mappingPixel gradientFull multigrid algorithm
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為了能記錄真實環境的面貌,而有了高動態範圍影像(High Dynamic Range Image; HDRI)格式的產生,但是這個格式所表達的數字範圍遠超過顯示裝置所能呈現的影像動態範圍,因此,要將高動態範圍影像呈現在顯示設備上,就須要將高動態範圍影像做動態範圍的映射。
將真實景像動態範圍進行壓縮或展開到顯示設備可顯示的範圍,這個過程被稱為色調映射 (Tone Mapping),由於色調映射技術的優劣會影響到影像呈現的主觀品質,為此,探討如何建立優秀的色調映射,近年已經有許多相關的論文被發表出來。
本研究計畫主要的目標是研究一個優質的色調映射技術,研究中首先是計算影像之對數灰階值、像素之梯度大小、影像平均梯度,接著利用像素本身梯度的大小、影像平均梯度及像素週邊平均梯度的大小來調整像素梯度的大小,最後利用全多格演算法(Full Multigrid Algorithm)計算出顯示裝置所能呈現的影像。

High dynamic range image (HDRI) is used to record the landscape of the real environment, but the range of the number of HDRI is far more than that of display device. Therefore, for displaying HDRI on the display device, HDRI must be mapped to the range of the number of the display device.
The process of compressing or expanding a high dynamic range image for displaying on display device is called tone mapping. For the tone mapping technologies will affect the subjective quality of the image presented, therefore, many papers exploring tone mapping were published in recent years.
The main goal of this research project is to study an excellent tone mapping technique. In the study, first, the logarithms of gray values of the pixels, the gradients of the pixels and mean gradient of the image were calculated. Then, the gradients of the pixels, mean gradient of the image and average gradient of the surrounding pixels were used to adjust the gradient of the pixel. Last, using the full multigrid algorithm (full multigrid algorithm) is used to get the images that display device can render.

摘要 I
Abstract III
致謝 V
目 錄 VI
圖 目 錄 VIII
表目錄 X
第一章 緒論 1
1.1 問題描述 1
1.2 研究動機 3
1.3 論文架構 5
第二章 相關研究回顧 6
2.1 高動態範圍影像格式 6
2.2影像直方圖均化[11] 9
2.3快速雙向濾波方法 13
2.4最佳色調再現曲線運算子 15
2.5梯度域高動態範圍壓縮 19
第三章 研究方法與步驟 22
3.1梯度域的影像呈現 23
3.2 新色調映射技術 24
第四章 實驗結果 33
4.1實驗結果 34
4.2 實驗結果評估 53
第五章 結論與未來研究 54
參考文獻 55

[1]HDR, http://en.wikipedia.org/wiki/High_dynamic_range_imaging.
[2]Pattanaik, S. N., Ferwerda, J. A., Fairchild, M. D. and Greenberg, D. P., “A multiscale model of adaptation and spatial vision for realistic image display,” in Proc. ACM SIGGRAPH 98, Annual Conference on Computer Graphics, Orlando, FL, pp. 287-298, 1998.
[3]Webster, M. A., “Human colour perception and its adaptation, “ Network: Computation in Neural Systems 7(4), 587-634. 1996.
[4]Johnson, G. M., “Cares and concerns of CIE TC8-08: Spatial appearance modeling and HDR rendering,” in Proc. IS&T/SPIE Electronic Imaging 2005, Vol. 5668, San Jose, CA, pp. 148-156, 2005.
[5]Tumblin, J., AND Rushmeier, H. E., “Tone reproduction for realistic images.” IEEE Computer Graphics and Applications 13, 6 (Nov.), 42–48, 1993.
[6]Ward, G. J., “A contrast-based scale factor for luminance display.” In Graphics Gems IV, P. S. Heckbert, Ed. Academic Press Professional, 415–421, 1994.
[7]E. Rheinhard, M. Stark, P. Shirley, and J. Ferwerda, “Photographic tone reproduction for digital images” ACM SIGGRAPH, 2002.
[8]F. Durand and J. Dorsey, “Fast bilateral filtering for the display ofhigh-dynamic- range images,” ACM Trans. on Graphics, pp. 257–266, 2002.
[9]R. Fattal, D. Lischinski, and M. Werman, “Gradient domain high dynamic range compression,” ACM Trans. on Graphics, pp. 249–256, 2002.
[10]Gregory J. Ward. “The RADIANCE lighting simulation and rendering system. Computer Graphics”, 28(2):459–472, July 1994. ACM Siggraph ’94 Conference Proceedings.
[11]Histogram_equalization, https://en.wikipedia.org/wiki/Histogram_equalization,July 21, 2015.
[12]F. Durand and J. Dorsey, “Fast bilateral filtering for the display of high-dynamic- range images,” ACM Trans. on Graphics, pp. 257–266, 2002.
[13]G. Qiu and J Duan, “An optimal tone reproduction curve operator for the display of high dynamic range images”, ISCAS2005, Proc. of IEEE International Symposium on Circuits and Systems, vol. 6, pp. 6276- 6279, Kobe, Japan, 23 - 26 May 2005
[14]Gregory J. Ward. “The RADIANCE lighting simulation and rendering system. Computer Graphics”, ACM Siggraph ’94 Conference Proceedings, 28(2):459–472, July 1994.
[15]Paul Debevec, Jitendra Malik, “Recovering High Dynamic Range Radiance Maps from Photographs,” Computer Graphics (Proceedings of SIGGRAPH 97), ACM, 1997.
[16]郭忠民,吳保樹,“以內容為基礎的高動態範圍影像色調映射”,碩士論文,義守大學,2014。
[17]郭忠民,林彥廷,“加權分段色調映射之高動態影像顯示”,碩士論文,義守大學,2015。
[18]竇祥庭,“應用於高動態範圍影像之新色調映射技術之研究”,碩士論文,義守大學,2015。
[19]Tone mapping, https://en.wikipedia.org/wiki/Tone_mapping, April 18, 2016.
[20]Harry N Abrams, "Vision and Art: The Biology of Seeing." Livingstone, M. 2002.

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