数字水印技术就是在这个背景下应运而生的，它可以有效地弥补传统信息加密方式的缺点。
Digital watermarking occurred in such a background, which can make up for the shortcomings of traditional methods of information cryptology.
传统的基于分形编码的水印技术一般采用0,1码，没有实现灰度图像的嵌入。
The traditional watermarking techniques based on fractal coding is generally using 0, 1 sequence as the watermark.
传统的混沌水印置乱方案存在的两类不足：抗混沌预测技术的能力和有限字长效应的影响。
The traditional chaotic watermark scrambling method has two weak points: the ability of anti-forecast technology and the influence of word length.
方法针对传统数字水印技术的有限性，通过对频域数字水印算法进行分析，提出了一种新的数字水印算法。
Methods Owing to the shortcomings of the traditional digital watermark techniques, analyze the frequency domain watermark algorithm, propose a new digital watermark method.
该算法不是采用传统的图像归一化技术，所以保证了水印图像的高透明性，即保证了嵌入水印后的图像的高质量。
The algorithm does not apply the traditional im - age normalization technique, so it guarantees watermarked image high transparency, that is to ensure high quality of watermarked image.
在传统扩频水印技术的基础上，我们讨论了一种基于相位偏移的非对称数字水印方案。
Based on traditional spread-spectrum watermarking, we discuss an asymmetric watermarking scheme using random-phase-shift.
传统的基于分形编码的水印技术一般嵌入0,1序列，没有实现灰度图像嵌入。
For traditional watermarking techniques based on fractal coding, watermarking format is limited to binary sequence 0, 1, thus incapable of gray-scale image embedding.
传统的基于分形编码的水印技术一般嵌入0,1序列，没有实现灰度图像嵌入。
For traditional watermarking techniques based on fractal coding, watermarking format is limited to binary sequence 0, 1, thus incapable of gray-scale image embedding.
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