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研究生： 黃志祥
Chih-Hsiang Huang
論文名稱： 以區域對比估測及攝影色調重現的高動態範圍影像處理
High Dynamic Range Imaging with Local Contrast Evaluation and Photographic Tone Reproduction
指導教授： 高文忠
Kao, Wen-Chung
學位類別： 碩士
Master
系所名稱： 電機工程學系
Department of Electrical Engineering
論文出版年： 2010
畢業學年度： 98
語文別： 中文
論文頁數： 95
中文關鍵詞： 高動態範圍 、區域對比估測 、色調重現
英文關鍵詞： high dynamic range, local contrast evaluation, tone reproduction
論文種類： 學術論文
相關次數： 點閱：192  下載：27 
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    • 本文介紹一個色調重現的完整信號處理流程，這是使用在高動態範圍(high dynamic range, HDR)成像系統。流程中首先抽取出像素的區域對比，然後利用直方統計圖均化的方法非線性地延伸動態範圍。在抽取出來的區域對比圖中會產生我們不想要的人造影像，需要經由雙邊濾波器(bilateral filter)和相似濾波器(similar filter)加以平滑化，相似濾波器是找出和中心點顏色相近的周圍其他像素做亮度值的平均，該像素的亮度值被該點本身原來的值及平滑化後之區域對比值的幾何平均數所替換。最後，用攝影色調重現演算法做正規化使得在整個影像中亮度取對數後的平均值大約是18%灰色調。不論是色調重現或者是色彩重現，我們所提出的高動態處理流程比其他常用的方法表現出更好的效果。

    This thesis presents an integrated signal processing pipeline for tone reproduction that is used in high dynamic range (HDR) imaging systems. The pipeline first extracts pixel local contrasts and then nonlinearly stretches the range through histogram equalization. The undesired artifacts in the contrast map are then smoothed by the similar filter, which averages the pixel luminance values only when the colors of neighboring pixels are similar to the central one. The luminance value for a pixel is replaced by the geometric mean of its original value and smoothed contrast value. Finally, the photographic tone reproduction algorithm normalizes pixel values such that the average of log luminance value in the entire image is around 18% gray tone. The proposed HDR processing pipeline shows better performance on both tone and color reproduction compared with other popular approaches.

    摘要 i ABSTRACT ii 誌謝 iii 目錄 iv 圖目錄 vi 表目錄 ix 第一章　　緒論 1 1.1　研究背景與動機 1 1.2　相關研究 2 1.3　高動態範圍存在的問題 3 1.4　論文架構 5 第二章　　色調重現相關研究及高動態範圍環境之探討 7 2.1　相關背景 7 2.1.1　動態範圍 7 2.1.2　人類視覺系統 10 2.1.3　色彩空間 12 2.2　色調重現之相關研究 14 2.2.1　直方圖等化 14 2.2.2　色調重現曲線(Tone Reproduction Curve)映射 16 2.2.3　色調重現運算子(Tone Reproduction Operator)映射 17 2.2.4　多重曝光影像合成 18 2.3　高動態範圍環境之探討 19 第三章　　高動態範圍之影像處理 21 3.1　演算法架構 21 3.2　雙邊濾波器(bilateral filter) 23 3.3　區域對比估測(local contrast map evaluation) 26 3.4　攝影色調重現(photographic tone reproduction) 28 3.5　以影像處理為基礎應用於視訊處理 30 第四章　　實驗結果 34 4.1　概要 34 4.2　攝影色調重現的結果 35 4.3　區域對比增強的結果 46 4.4　視訊處理的結果 52 4.5　各模組處理時間 53 4.6　其他測試實驗結果 53 4.6.1　重複執行兩次後的結果 53 4.6.2　區域對比估測內各模組的存在性 55 4.6.3　輸入非HDR影像的結果 58 第五章　　結論與未來展望 60 5.1　結論 60 5.2　未來展望 60 參考文獻 62 附錄A 66 附錄B 86

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