localized watermark 中文意思是什麼
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In semi - fragile image watermarking algorithm, a robust watermark and a fragile watermark are extracted from the third approximation coefficient of wavelet transform of the original image. the two watermarks are embedded into the third vertical and horizontal detail coefficients. when authenticating image, image can be authenticated correctly and attacked parts can be localized through comparing the original watermarks and extracted watermarks
其中，完全認證方法，利用qr分解的特性把圖像的邊緣信息嵌入到載體圖像中，演算法對各種攻擊都具有很好的敏感性;內容認證方法，從載體圖像中提取出一個脆弱水印和一個魯棒水印，並把它們重新嵌入到載體圖像中，認證時，通過兩個水印在圖像傳輸前後的變化情況來對圖像的保留價值進行評估，並準確定位受攻擊部位。 -
The states of the art of dvd protection are described, and two protocol ( cprm and dtcp ), which is proposed by w09 group, are introduced. a novel fragile watermarking approach and related tamper detection are proposed. taking still image as an example, the watermark are embedded in the discrete wavelet domain of an image, so tamper detection is possible in localized spatial and frequency regions
第7章探討了水印演算法設計與水印應用系統設計間的區別，指出水印系統的實用性不僅僅取決于技術上的完善，同時也需要具有完備的協議；提出了一種二維偽隨機序列的產生方法；討論了影響水印系統性能的主要因素及解決方法；舉例說明了完整水印系統的設計過程並嘗試提出了一種完整水印系統協議。
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