因此，同理的，虚拟服务器也这样工作：不可察觉的。
信息隐藏是在图像、音频、视频等数字媒体中嵌入不可察觉的隐蔽数据。
Steganograhy is to embed unperceivable data in Medias of images, audio or video.
实验结果表明水印是不可察觉的，经过JPEG有损压缩、低通与中值滤波、剪切等图像处理操作后仍是鲁棒的。
Experimental results show that the proposed scheme is robust for some image processing operations such as lossy JPEG compression, low pass filtering, median filtering and cropping.
道路缓慢而几乎不可察觉地开始向上攀升，在林木环绕的山丘上曲折地蜿蜒前进。
Slowly and almost imperceptibly the road started to climb upwards, looping its way in languid curves around the forested hills.
而第三条道路，一开始几乎不可察觉，在经过过去的岁月的洗礼之后，慢慢地揭开了它的面纱，而这也正是我所需要的道路。
The third path now, almost invisible at first, has more and more unveiled over the last years. That path is the one I need to walk on.
实验和分析结果表明，算法具有较高的安全性和人眼不可察觉性。
Experiment and analysis show this method has more security and vision invisible.
实验和分析结果表明，算法具有较高的安全性和人眼不可察觉性。
Experiment and analysis show this method has more security and vision invisible.
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