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研究生:王彰盟
研究生(外文):Jang-Meng Wang
論文名稱:光學式浮水印系統在雜訊上的靈敏度
論文名稱(外文):On the noise sensitivity of optical watermark system
指導教授:林立謙
指導教授(外文):L.C. Lin
學位類別:碩士
校院名稱:逢甲大學
系所名稱:通訊工程所
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:2005
畢業學年度:93
語文別:中文
論文頁數:53
中文關鍵詞:浮水印非線性光學式鑑識器全像光學式浮水印系統
外文關鍵詞:nonlinear optical correlatorhologramwatermarkingoptical watermark system (OWS)
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本文主要在探討在光學式數位浮水印之系統鑑定時,會受到訊雜干擾之影響及非線性光學式鑑識器之分析。數位全像浮水印的製作係將特定標記圖像經由相位調變加以隱藏,並且將定經由傅立葉轉換後的全像乘上一權重值並嵌入封面影像,使得肉眼無法分辨。此浮水印封面影像的鑑定則依其與原來所加標記訊號相關性決定正確性,若與原來所加內碼訊號相同為自相關,而與原來所加內碼訊號不同則為叉相關,對於鑑定的結果可依其峰值相關訊號的高低來加以斷定。本文針對兩點問題作探討:第一點為雜訊對於光學式浮水印系統之影響;第二點考慮系統中的非線性元之影響。當數位全像浮水印封面影像受各種攻擊,如白高斯雜訊、遮蓋影像某部份或量化等,我們提供一個在輸出相關性上統計分析,以統計各雜訊的影響,還有光學式鑑識器中的SLM為非線性元件,因此我們也針對非線性環境影響提供分析。本論文以實驗加以探討。
This paper is to discuss the effect of noise and analyze nonlinearity of the optical correlator on detection procedure of the optical watermark system (OWS). In the digital holographic watermarking scheme, the watermark is constructed by an optically holography architecture, and the watermarked hologram is embedded into a cover image. For the Detection, the optical correlator is used to detect the embedded watermark based on the correlation of the watermarked image and the authorized mark pattern. Given a sharp correlation, one can claim that the watermarked image has a correct mark. Conversely, the mark is absence.
This thesis consists of two purposes: one is to discuss the noise effect of the optical watermark system and the second is to consider the influence of the nonlinear device of the system. When the watermarked image interrupted by various type of noises such as additive white noise、occlusion of one part of the image and quantization, we develop an statistical model for analyzing the output correlation under the noise environment. Furthermore, since the watermarked image is a wide range gray-level image, the nonlinear SLM effect should consider under this structure. Thus, we derive the nonlinear relationship for the input and output of the SLM and use it to consider output correlation under the nonlinear environment. Experimental results is demonstrated the performance of the optical watermark system under the noise corruption and the nonlinear effect of the optical device in the system.
第1章 緒論
1.1 浮水印之技術及其應用
1.2 光學信號處理
1.3 光學式數位浮水印之產生與鑑定
1.4 論文研究重點及目的
1.5 貢獻
第2章 光學式數位浮水印之系統
2.1 數位全像型浮水印之製作程序
2.2 數位全像型浮水印之鑑定程序
第3章 非線性光學式鑑識器
第4章 雜訊對於浮水印強韌度之影響
4.1 雜訊的模型
4.2 三種雜訊
4.3 雜訊在光學式鑑識器的反應
第5章 實驗結果
5.1 線性下的三種雜訊
5.2 非線性下三種雜訊
第6章 結論
參考文獻
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