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.
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