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Evaluation of Performance of Watermarking Techniques and Development of its Support System

水印技术性能评价及其支持系统开发

基本信息

批准号：
13650416
负责人：
MIYAZAKI Akio
金额：
$ 2.24万
依托单位：
Kyushu Sangyo University (2002)Kyushu University (2001)
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-13650416/
关键词：
digital watermark watermarking information security digital contents digital image and video evaluation of watermark robustness of watermark deconvolution 著作権保護

项目摘要

【○!1】 On the evaluation of performance of watermarking techniques and the improvement of watermarking techniques using the evaluation method : In this research, we aim to establish a tool for evaluating the performance of watermarking methods. We have focused on the quantization-based and correlation-based watermarking methods in the frequency domain, and proposed how to evaluate the performance of these methods. In this evaluation method, we measure the quantity of embedded watermark, the quality of watermarked image, the rate of watermark detection, and the robustness against image processings and attacks. Furthermore, we can know where watermark should be embedded in order for a watermarking method to be robust against image processings and attacks. Using this information, we can improve the robustness of the watermark method.【○!2】 Analysis of watermarking systems using digital signal processing technique and its application to design of robust watermarking systems : In this researc … More h, we have concentrated on the watermarking of still images and deal with the quantization-based and correlation-based watermarking methods. We have first presented a model of the watermark embedding and extracting processes and investigated the robustness of the watermarking system against image processings and attacks. Based on the results, it has been clarified how distortion of the watermark occurs by image processing and the reason why the distortion causes detection errors in the watermark extracting procedure. And then we have discussed the performance of the watermarking systems from the view point of quality of the watermarked image, quantity of the embedded watermark data, and robustness of the watermarking system, and given a method for evaluating their performance. Furthermore we have studied an improvement of the watermark extracting process by designing a deconvolution filter that attempts to undo the effect of watermark distortion. The design has been achieved using the deconvolution technique with adaptive algorithms. Numerical experiments with the DCT-based watermarking system have shown good performance. Less

○！1]水印技术的性能评估和改进的水印技术使用的评估方法：在这项研究中，我们的目标是建立一个工具，用于评估水印方法的性能。重点研究了基于量化和基于相关性的频域数字水印算法，并提出了如何评价这两种算法的性能。在该评估方法中，我们衡量嵌入水印的数量，水印图像的质量，水印检测率，以及对图像处理和攻击的鲁棒性。此外，我们可以知道水印应该嵌入在哪里，以便水印方法对图像处理和攻击具有鲁棒性。利用这些信息，我们可以提高水印方法的鲁棒性。○！2]利用数字信号处理技术分析水印系统及其在鲁棒性水印系统设计中的应用 ...更多信息 h.重点研究了静止图像的水印技术，讨论了基于量化和基于相关性的水印算法。我们首先提出了一个水印嵌入和提取过程的模型，并研究了水印系统对图像处理和攻击的鲁棒性。根据实验结果，阐明了图像处理过程中水印失真的产生机理以及在水印提取过程中水印失真导致检测错误的原因。然后从水印图像质量、嵌入水印数据量和水印系统的鲁棒性等方面讨论了水印系统的性能，并给出了一种评价水印系统性能的方法。此外，我们还研究了一种改进的水印提取过程中，通过设计一个反卷积滤波器，试图撤消水印失真的影响。该设计已实现使用反卷积技术与自适应算法。基于DCT的数字水印系统的数值实验显示了良好的性能。少