A Multipurpose Watermarking Technique with Fragility and Robustness on JPEG Image
| Autor: | Shih-chieh Chao, 趙士傑 |
|---|---|
| Rok vydání: | 2007 |
| Druh dokumentu: | 學位論文 ; thesis |
| Popis: | 95 Multipurpose digital watermarking techniques are published in recent years. Those techniques embed the different watermarks such as fragile and robust for combining the advantages. In this paper, we propose a multipurpose watermarking technique with fragility and robustness on JPEG image. First, we generate many watermarks with the user key and copyright information so that they are different from each others. Then calculate the image block features and the correlations for embedding those watermarks into the Discrete Cosine Transform (DCT) coefficients. By using the Repetition Code mechanism, those embedded watermarks can be converting to original copyright information that is used to generate those watermarks so that it obtains the function of copyright information protection. Because of the Embedding Factor (EF) is used to calculate the image block correlations, the watermarking technique can adjust between the fragility and the robustness of the embedded watermarks. By the experiment result, this technique can detect the modified regions with block unit and overcomes the cut-and-paste attack, vector quantization attack and transplantation attack. The copyright information has a strong robustness to low pass filter and Gaussian noise. |
| Databáze: | Networked Digital Library of Theses & Dissertations |
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