國防科學技術大學計算機學院 湖南長沙 410073
摘要：提出一種彩色圖像頻率域的半脆弱數字水印算法，根據人眼視覺特性，選擇在圖像的 色彩空間嵌入水印信息，以亮度分量Y的L+1級小波系數作為原始水印信號，通過分塊量化方法，將水印信號分別嵌入到載體圖像的亮度 和色度 分量的最低頻小波系數中。實驗表明，算法安全性透明性高，對常規圖像處理操作具有魯棒性，對惡意內容篡改具有良好的脆弱性，并能將惡意篡改定位到2*2圖像塊，同時誤檢率與漏檢率均比較低。
關鍵字：彩色圖像半脆弱水印圖像認證小波變換
An Semi-fragile Watermarking Algorithm
For Color Image
Tan Chunjiao
National University Of Defense Technology Changsha,Hunan 410073
Abstract:A frequency domainsemi-fragilewatermarking algorithm for color imageis proposed, based on thehuman visual properties, theYCbCrimagecolor spaceis selected.Choosing theL +1levelof wavelet coefficients of the luminance componentYas the originalwatermarksignal, watermarksignalsareembedded intothemostlow-frequencywavelet coefficients of the luminance component Y and the chrominancecomponents(Cb、Cr)ofby theblocksmeasuring method. Experiments show that, the Algorithm in highsecurity and good transparent, and robustagainstthe conventionalimageprocessing while fragile to malicioustampering, in the same time, it can mark malicioustampering tothe imageblock2 *2, while in lowfalse detectionrate and undetected.
Keywords:color imagesemi-fragile watermarking
wavelettransformimage authentication
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作者簡介：譚春嬌，國防科學技術大學計算機學院助教，研究方向：數字圖像處理。
