基于小波變換的數(shù)字水印及版權保護
WAVELET-BASED DIGITAL WATERMARKS AND COPYRIGHT PROTECTION
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摘要: 數(shù)字水印技術是近年來關于版權保護方面研究的一個新課題,通常的水印是指嵌入在圖像中的隱蔽的信息,作為數(shù)字圖像的標簽。通過復雜的水印嵌入方法可以防止非授權拷貝或對圖像的其它攻擊性操作。本文提出了基于塊的小波變換下水印的嵌入和提取方法,使每一個水印像素隱藏在相應的圖像塊的中低頻小波系數(shù)之中。利用本文的水印技術可以較好地解決版權爭議等問題。理論分析和實驗結果均證明了本文提出的方法是有效的和可行的。Abstract: Digital watermarking is a new research topic about copyright protection in recent years. Watermarking is a technique for labeling digital picture by hidding secret information in the images. Sophisticated watermark embedding is a potential method to discourage unauthorized copying or attacking the images. This paper presents a technique of watermark embedding and extracting based on discrete wavelet transform of blocks in the image. Each pixel of a watermark is embedded in the wavelet coefficient of the middle and low frequency of a block in the images. Disputation about copyright can be settled down by using the watermark embedding technique presented in this paper. Both theoretical analysis and experimental results show that this technique is reasonable and satisfactory.
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