用於適應環境光亮度的影像處理方法｜國立臺灣科技大學博碩士論文系統

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研究生：	楊孫成 Sun-Chen Yang
論文名稱：	用於適應環境光亮度的影像處理方法 Adaptable Image Processing Methods for Changing Ambient Illuminations
指導教授：	陳建中 Jiann-Jone Chen
口試委員:	唐政元 Cheng-Yuan Tang 蔡耀宏 Yao-Hong Tsai 曾德峰 Der-Feng, Tseng
學位類別：	碩士 Master
系所名稱：	電資學院 - 電機工程系 Department of Electrical Engineering
論文出版年：	2006
畢業學年度：	94
語文別：	中文
論文頁數：	62
中文關鍵詞：	數位平面顯示器、影像處理、伽嗎轉換曲線、亮度保持雙柱
外文關鍵詞：	Digital FPD, Image processing, Gamma Correction Curve, Brightness
相關次數：	點閱：185 下載：10
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隨著數位平面顯示器的技術發展，人體工學也逐漸受注重，數位
平面顯示器影像處理的方向不再只是改善畫質，更進一步發展可隨著
環境光亮度調整背光以適合人眼觀看之影像處理。尤其近來平面顯示
器在可攜式裝置的普遍應用，此一影像處理技術更相形重要。本論文
我們提出一個適應環境光亮度的數位影像處理。一般對人眼觀看舒適
的原則為背光亮度與環境光亮度成正比。例如:在環境光亮度低時則背
光源亮度就低，此時的影像若不做處理，其色澤特別黯淡且紋理不易
辨認。為了提升其色澤亮度，我們使用視訊伽嗎轉換曲線(Gamma, G)
修正對影像的色澤亮度作加強，再配合亮度保持雙柱狀圖平均法來提
升影像紋理品質。藉著同時調整這兩種參數的與人眼評估，更能有效
提高及還原所顯示影像的原始品質。

Recently, the technologies of digital FPD (Flat Panel Display) have been rapidly
developed. In addition, people start to pay attentions to FPD’s ergonomic performance.
The technologies of digital FPD consist of not only how to improve the image quality
but also the adaptation ability to changing environmental illuminations to yield better
subjective performances. The later is much more important especially when the
digital FPD is widely used in handheld devices now. To provide better visualizations
for digital FPD, the back light brightness should be adjusted and be proportional to the
environmental illumination. We propose to utilize the “gamma correction curve” and
“brightness preserving bi-histogram equalization” to set up visualization model for
different environmental illuminations. Two sets of parameters have been determined
based on the mean opinion score (MOS) evaluation process. Simulations show that
the visualization model can help to improve the subjective performance.

摘要.................................................................... I
英文摘要............................................................... II
誌 謝................................................................ III
目錄.................................................................... 1
圖目錄.................................................................. 3
第一章 緒論............................................................. 4
1.1. 研究動機.......................................................... 4
1.2. 研究目的.......................................................... 4
1.3. 論文架構.......................................................... 6
第二章 平面顯示器原理介紹與文獻探討..................................... 7
2.1. 液晶顯示器........................................................ 7
2.1.1. 成像原理與驅動架構............................................ 7
2.1.2. 文獻探討-液晶面板在感測環境光下10 位元灰階影像處理........... 10
2.2. 電漿顯示器....................................................... 12
2.2.1. 成像原理與驅動架構........................................... 12
2.2.2. 文獻探討-電漿面板的驅動裝置.................................. 13
2.3. 其他隨環境光而調整背光源亮度的例子............................... 15
第三章 伽嗎轉換曲線與亮度保持雙柱狀圖平均法............................ 16
3.1. 伽嗎轉換曲線..................................................... 16
3.1.1.方法簡介...................................................... 17
3.1.2.參數設定與結果分析............................................ 17
3.2. 亮度保持雙柱狀圖平均法........................................... 18
3.2.1.方法簡介...................................................... 18
3.2.2.參數設定與結果分析............................................ 20
第四章 一個適應環境光亮度的影像處理技術................................ 23
4.1. 影像處理的參數評估與選擇......................................... 23
4.2. 實驗結果......................................................... 24
4.3. 動態影像實驗結果綜合比較......................................... 37
第五章................................................................. 46
5.1. 結論............................................................. 46
5.2. 未來研究......................................................... 47
REFERENCES ............................................................. 48
MATHCAD 程式........................................................... 50
1.Bi-Histogram Equalization......................................... 50
2. Gamma Correction................................................. 51
3. Others........................................................... 51
MATLAB 程式............................................................ 54
AVI 轉檔程式........................................................ 54
去模糊影像強化程式.................................................. 54

                                

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