To promote the robustness better, watermark algorithm based on DCT domain to embed in low frequency area and the watermark algorithm based on wavelet transform are studied.
为了更好的提高水印的鲁棒性,研究了把水印嵌入低频区域的基于DCT域的水印算法及基于小波变换的水印算法。
参考来源 - 数字水印算法及其应用的研究·2,447,543篇论文数据，部分数据来源于NoteExpress
Thus research has been going on for some time in the area of low frequency active (LFA) towed array sonar.
如此研究一直在低频率活跃的 （LFA） 被拖的排列声纳的区域中继续有一些时间之久。
Signal is in low frequency, while noise in high frequency and minutia in image is also in this area.
信号主要分布在低频区域，而噪声主要分布在高频区域，同时图像的细节也分布在高频区域。
The backwashof low frequency, high compressive strength, no powder, no hardening, high activity and large specific surface area, good regeneration effect.
反洗频率低，抗压强度高，不粉化、不板结，比表面积大，活性高，再生效果好。
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