期刊名称：International Journal of Computer Trends and Technology
电子版ISSN：2231-2803
出版年度：2013
卷号：4
期号：9-1
出版社：Seventh Sense Research Group
摘要：Various signals have a very extensive dynamic range, peak signal noise ratio is generally communicated in relations of the logarithmic decibel scale. Every geometric attack is defined by a set of parameters that determines the operation performed over the target image. The Discrete Cosine Transformation coefficients are modified to embed the watermark data. Because of the conflict between robustness and transparency, the modification is usually made in middle frequencies, avoiding the lowest and highest bands. Singular Value Decompositionbased watermarking is that the largest of the modified singular values change very little for most types of attacks.
关键词：Watermarking; Peak Signal Noise Ratio; Discrete Cosine Transform; Singular Value Decomposition; Attack
