The watermark is embedded in the significant coefficient in the low frequency was found to be robust, but the watermarked image is easily visible distortion.

• 将浮水印藏在影像频率域中的低频带的重要系数，经研究可使浮水印较具强韧性来抵抗外部影像处理攻击，但也因此牺牲影像的品质。