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1·The embedding strength is decided by the just noticeable difference of the image, and the cover image is not needed during the extraction of watermark.

水印的嵌入强度由图像的视觉临界差异决定，水印的提取不需要载体图像。

2·The resource requirements are just as noticeable as the speed difference.

资源需求与速度差别一样明显。

3·Tweak the amount of Compression with the compression slider to just before the difference in sound quality is noticeable.

用压缩滑动条（Compression）来调整压缩量，前后音质的差异是明显的。