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標題: 利用小波轉換技術之互補式數位浮水印
Complementary Digital Watermarking Technique Based on Wavelet Transformation
作者: 蘇勝中
關鍵字: watermark;數位浮水印;wavelet;complementary Watermark;Blurring;sharpening;noise;robustness;小波轉換;互補式浮水印;模糊化;銳利化;雜訊化;強健性
出版社: 電機工程學系
摘 要
我們針對photoshop 常做之一般影像處理,來驗證加入浮水印之影像經過JPEG壓縮、模糊化、銳利化、雜訊化、圖形裁剪處理後其浮水印偵測結果,結果顯示我們的方法在遭受一般影像攻擊時,大部分都至少有一個浮水印能存活。

Digital image watermark is a technique which takes advantage of the inability of human's eyes to differentiate the subtle change of images. It is a special information embedded and hidden in the original image. Even if the image data is encrypted and decrypted, compressed, unintentional or any other kind of attack, the embedded digital image watermark can still be detected.
In this thesis,we propose a complementary watermark technique which uses the skill of wavelet transformation to protect image data. Two complementary watermarks are hidden in the high and low frequencies respectively in the transformed frequency domain. Using this technique , there will be at least one watermark can survive under attack .Besides, in the process of retriever the watermark, the original image isn't needed. Thus,save a lot of memory. The simulation results show that distortion of the original image caused by the insertion of watermark can be minimized. we also examine the outcome of watermark detection under JPEG compression, blurring, sharpening, noise and cutting based on the average image processing skills of Photoshop. The results show that our method can survive from most of the attack.
Appears in Collections:電機工程學系所

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