Watermarking is a technique for hiding of data in a medium coverage so that its presence is not detectable by a human eye and is recoverable only by the authorized recipient. Two of the most important features of watermarked image are transparency and robustness which are largely related to the security of watermarking algorithms. In this paper, an image watermarking scheme based on BCH error correction code in Discrete Cosine Transformation (DCT) domain is considered. Before embedding process, the watermark is encoded through BCH coding. Then it is embedded into the Discrete Cosine Transformation (DCT) coefficients of cover image. In order to decrease embedding complexity and speed up the process of finding the best position to insert a watermark signal, lookup table method is utilized. The key features of proposed method include the reduction of time required in the process embedding of information, security and ability to correct the error caused by variety of attacks and destructions as well. Watermarked image robustness has been investigated against different kinds attacks and the simulation results indicate that the proposed algorithm outperforms the existing methods in terms of imperceptibility, robustness and security.
翻译:水标记是一种在中层覆盖中隐藏数据的技术,使数据的存在无法通过人的眼睛探测出来,只能由授权的接收者恢复。水标记图像的两个最重要的特征是透明度和稳健性,这在很大程度上与水标记算法的安全有关。在本文中,根据Discrete Cosine Transferction (DCT) 域的BCH错误校正代码考虑一个图像水标记办法。在嵌入过程之前,水标记通过BCH编码编码。然后,水标记通过BCH编码而编码。它被嵌入隐蔽图像的分立孔孔转换系数中。为了降低嵌入复杂性并加快找到插入水标记信号的最佳位置的过程,使用了查找表方法。拟议方法的主要特征包括缩短在嵌入信息、安全和纠正各种攻击和破坏造成的错误过程中所需的时间。水标记图像坚固性经过了对不同类型攻击的调查,模拟结果显示,拟议的算法在不透明性、稳健性和安全性方面超越了现有方法。