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研究生:曾星喜
研究生(外文):Shing-shi Tseng
論文名稱:基於底色移除法對LCD的色彩校正
論文名稱(外文):A COLOR CALIBRATION FOR LCDS BASED ON THE CONCEPT OF UNDER COLOR REMOVAL
指導教授:吳瑞卿吳瑞卿引用關係
指導教授(外文):Ray-Chin Wu
學位類別:碩士
校院名稱:大同大學
系所名稱:光電工程研究所
學門:工程學門
學類:電資工程學類
論文種類:學術論文
論文出版年:2009
畢業學年度:97
語文別:中文
論文頁數:83
中文關鍵詞:色彩管理系統色彩特性GOG模型遮蔽模型底色移除法色彩校正
外文關鍵詞:Color characterizationMasking modelcolor calibrationColor management systemUnder color removal
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隨著科技的進步,液晶顯示器已經逐漸取代了陰極射線管的顯示器,成為市場上的主流。在市場的需求中,因為輸入相同的影像訊號在不同的顯示器上,常會有不同的色彩再現,這容易讓人產生困擾的。因此,為了要將輸入的影像訊號,在不同的顯示器上有相同的色彩再現,必須要做色彩的校正。
當要做色彩校正之前,需要先了解色彩管理系統是如何控制輸入的訊號,經過顯示器時讓色彩校正到預期的顏色。在本研究中,為了要做色彩校正,首先必須了解顯示器的色彩特性,以及適合顯示器色彩特性的逆運算模型。由於,一般顯示器的色彩特性中存在有色彩通道的相互作用和背光漏光的問題,本研究曾就考慮此兩問題,利用GOG模型的電光轉換,以及印刷常用的底色移除法提出一個有效的加權遮蔽特性模型,能準確的預測出輸入數位訊號所對應的色彩,因此本研究以加權遮蔽模型為基礎,進一步探討並推導其模式的逆運算模型,提出一個可行正確並簡單的色彩校正模式,將相同的輸入影像訊號透過適當的校正模式能在不同特性的顯示器中呈現出相同的色彩影像。
本研究提出近似加權遮蔽模型逆運算的模型,預測出目標色所對應的數位訊號模型,透過數位及影像的各種評估,驗證所提出模型的正確性,同時利用所提的校正模式,將各種不同的螢幕校正到Gamma為2.2的sRGB標準色彩空間,由量測出的Gamma值驗證其精確性。最後,利用各種不同的影像在不同的螢幕上進行色彩校正,也都有不錯的成果。
With the process of the technology, the LCD has already replaced the CRT and become more popular on the market. However, the same image-signal input always has different color reproductions displayed on different displays and it results in the confusion for the consumer in the e-shopping market. The color calibration of display is necessary to produce the same color productions for the same color image.
The color calibration plays the key role in establishing of color management system. For the color calibration, the prediction of digit counts for the desired colors, the accurate color characterization model with available inverse model is required. The weighted masking model using the under color removal technique to take the interaction between channels into account was proposed and the accuracy of the model for predicting color from the input digit count was also indicated. In this research, the inverse characterization model for the weighted masking model is studied to derive an available and accurate color calibration model.
In this research, a color calibration model based on the weighted masking model is proposed and the evaluation of the models is also carried out. The experimental results show that the different displays are calibrated into the same color space, such as 2.2 of gamma value, using the proposed model.
致謝 I
摘要 II
ABSTRACT IV
目錄 VI
圖目錄 IX
表目錄 XII
第一章 緒論 1
1.1前言 1
1.2研究動機與目標 2
1.3論文架構 4
第二章 文獻探討 5
2.1色度學 5
2.1.1人眼視覺感知 5
2.1.2CIE標準色度系統 7
2.1.3均等色彩空間 11
2.1.4色差公式 14
2.2sRGB標準色彩空間 18
2.3顯示器的色彩特性 19
2.3.1非線性電光轉換函數 20
2.3.2線性轉換函數 21
2.3.3LCD與CRT顯示器之結構 22
2.4顯示器的色彩量測模式 24
2.4.1一般的色彩量測模型 24
2.4.2主成份分析法的色彩量測模型 26
2.4.3遮蔽模型之色彩量測模型 27
2.5顯示器的色彩校正 32
第三章 提出模型與研究討論 35
3.1實驗設備 35
3.2加權遮蔽模型 38
3.3依據加權遮蔽模型的逆運算模式 42
3.3.1不考慮光訊號與DAC大小關係的逆運算模式 43
3.3.2考慮光訊號與DAC大小關係的逆運算模式 44
3.4評估色彩的逆運算模式 47
第四章 實驗結果討論 51
4.1顯示器色彩特性討論 51
4.1.1色彩非恆常性 51
4.1.2通道串擾效應 53
4.2實驗結果 59
4.2.1GOG模型的模擬方式 59
4.2.2加權遮蔽模型 60
4.2.3提出加權遮蔽模型的色彩校正模式 63
第五章 結論及未來發展 67
5.1結論 67
5.2未來發展 68
參考文獻 69
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