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Research on Digital Watermarking for Video Data and Text Documents

视频数据和文本文档数字水印研究

基本信息

批准号：
11650386
负责人：
MIYAZAKI Akio
金额：
$ 2.24万
依托单位：
KYUSHU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1999
资助国家：
日本
起止时间：
1999 至 2000
项目状态：
已结题

项目摘要

(1) Development of digital watermarking method for images and video :We have proposed a watermarking method for both still images and video using the wavelet transform. First, we have applied the proposed method to the watermark for still images and have shown that this method is robust against lossy compression like JPEG, adding noise, reduction of grayscale level, and StirMark attacks. Next, we have applied this method to the watermark for video. As a result, we have confirmed that the watermark is extracted from the watermarked video compressed with MPEG.(2) Development of digital watermarking method for text documents :We have presented a watermarking method for text documents using the morphological signal processing technique. This method embeds information data (watermark) into binary patterns such as character and/or figure patterns in text document. We have applied this method to the letters of the English alphabet and realize a watermark technique for English documents. Using the proposed technique, we have confirmed from numerical experiments that the embedded data can be detected from watermarked letters with noise and printed on paper.(3) On the evaluation of performance of digital watermarking method in the frequency domain :We have focused on the watermarking method in the frequency domain, in which watermark is embedded using a controlled quantization process, and suggested the model of watermark embedding and detecting system. Next, using this model, we have analyzed the watermarking method and proposed how to evaluate its performance. As a result, we can know how many bits are able to be embedded and how large the embedded intensity should be set. Furthermore, we have discussed the difference of the performance between the DWT- and DCT-based watermarking methods.

(1)图像和视频数字水印方法的发展：我们提出了一种基于小波变换的静态图像和视频数字水印方法。首先，我们将所提出的方法应用于静止图像的水印，并表明该方法对有损压缩（如JPEG）、添加噪声、降低灰度级和StirMark攻击具有鲁棒性。接下来，我们将这种方法应用到视频水印中。结果表明，该水印是从经过MPEG压缩的带水印视频中提取出来的。(2)文本文档数字水印方法的发展：提出了一种基于形态信号处理技术的文本文档数字水印方法。该方法将信息数据（水印）嵌入到文本文档中的字符和/或图形模式等二进制模式中。将此方法应用于英文字母的水印处理，实现了英文文档的水印技术。利用本文提出的方法，我们通过数值实验证明，嵌入的数据可以从带有噪声的水印字母和打印在纸上的字母中检测出来。(3)数字水印方法在频域的性能评价：重点研究了采用可控量化过程嵌入水印的频域水印方法，提出了水印嵌入与检测系统的模型。然后，利用该模型对水印方法进行了分析，并提出了对其性能的评价方法。因此，我们可以知道可以嵌入多少位以及应该设置多大的嵌入强度。此外，我们还讨论了基于DWT和基于dct的水印方法在性能上的差异。