Digital watermarking processing, embedding, extraction, authentication, can be in graphics, video and digital watermarking to add text to enhance the confidentiality of documents to prevent leak
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Digital watermarking is the technology that embeds secret information into digital multimedia data such as sound, image or video by using signal processing technology.
数字水印技术是用信号处理的方法在声音，图像或视频等数字化多媒体数据中嵌入隐蔽信息的行为。
In the dissertation, we study two technologies of image processing based on frequency domain. The one is on digital watermarking, the other is on image compressing.
本论文主要研究了基于变换域上的两个图像处理技术，即数字水印技术和图像压缩技术。
The watermarking technique robust to both signal processing attacks and geometrical attacks is one of the hotspots and difficulties in the digital watermarking research.
能有效抵抗信号处理又能抵抗几何攻击是当今数字水印研究的热点和难点之一，提出一种能够抵抗信号处理、旋转、缩放和平移的鲁棒视频水印。
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