There are now many published digital watermarking research papers covering image, video and audio documents, which demonstrate how effective these methods are.
目前，基于图像、视频和音频的数字水印研究成果很多，并且很多方法是比较有效的。
There are now many published digital watermarking research papers covering image, video and audio documents, which demonstrate how effective these methods are.
目前，基于图像、视频和音频的数字水印研究成果很多，并且很多方法是比较有效的。
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