【摘要】 综述了基于离散小波变换及离散余弦变换的数字图像水印算法.由于小波变换具有良好的局部性时频分析特性和多分辨率分析,而离散余弦变换具有良好的聚能效应,因此两者在图像水印领域有很好的应用效果.对基于两种变换的数字水印技术的相关概念和现有方法进行了描述与分析,同时总结了两类算法优缺点,并讨论了几种可能的解决策略。另外,对基于两种变换的数字图像水印技术的未来发展方向和前景进行了预测。更多还原

【Abstract】 To describe the digital image watermarkings based on DWT and DCT.Because of the excellent local time-frequence analysis and multi-analysis of DWT and the energy-compression characteristics of DCT,DWT and DCT have been used well in the field of the copyright protection of the image.The present algorithm of image watermark technique on DWT and DCT are reviewed with related concepts and discussed in detail.Besides,we also discuss several promising strategies.Furthermore,the development trends and perspective of digital image watermarking technique on DWT and DCT are predicted.更多还原