... 最小残余法：minimum residual method 最小不觉差：just not noticeable difference 最小变化法：minimal-change method ...
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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。
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