Through the computer simulation , the experimental results are obtained . the main contents of this thesis are as follows : ( l ) the statistic properties of one dimensional signal and noise based on wavelet transform are studied 探讨了一维信号和噪声在小波变换域中的不同的统计特性，它是小波变换应用于舰船辐射噪声信噪分离的理论基础。
( 3 ) hi the discrete cosine domain , the watermark is embedded by quantifying the coefficient of the dct domain and the quantification procession is given ; the watermark can be extracted without the original audio ( 3 )在离散余弦变换域，通过对变换域系数进行量化来嵌入水印信息，给出了量化方案；在水印的提取过程中不需要原始音频信号的参与。
This dissertation selects two - dimension binary image as watermark information , and selects audio as embedding object , and embed the watermark in the coefficient of the dft domain , the dct domain , the dwt domain 本文以直观的二值图像作为水印信息，以音频数据为嵌入对象，分别在离散傅立叶变换域、离散余弦变换域、离散小波变换域的系数上嵌入水印。
Based on the theoty of statistical dctection and research on distribution of dct coefficiefits , the chapter 3 proposes a robust 3d motion blind watermark detection algorithin , which is a sign correlation detection scheme 第三章基于统计检测理论与dct变换系数分布的研究，提出一个鲁棒的三维运动盲水印检测算法，它是一个dct变换域上的符号相关性检测算法。
The ridge characteristic related closely to the instantaneous frequency of the signal . a serial of ridge extraction and signal reconstruction algorithms have been developed using phase or module information of parameters on the ridges 由此发展出一系列根据变换域参数的相位信息、模值信息等提取脊的方法，同时也发展出各种利用脊上的信息对信号进行重建的方法。
Due to the energy distribution difference between targets and nature texture background in wavelet multiscale decomposing , the energy signature of sub - bands coefficients can be chosen as a simple but effective characterization of spatial texture 在小波变换域，纹理背景和目标区域的多级小波系数具有不同的能量分布，能量特徵可作为简单、有效的空间特徵来检测目标。
This paper introduces a bispectrum - based channel estimation algorithm to improve the accuracy of the channel estimation at pilots and proposes an equalization method with the view of the reduction of the interpolation error 为了提高信道估计的精度，本文分别从提高导频处信道估计精度和减小插值误差的角度出发提出了基于导频双谱的信道估计算法和基于变换域滤波的插值方法。
By applying generalized gaussian distribution to statistically model the alternating current coefficient of discrete cosine transform , the technology of the blind image watermark is studied and the performance of the new detector is analyzed 摘要根据数字图像离散余弦变换域交流系数的广义高斯分布模型，对盲图像水印技术进行研究，并给出了水印检测器检测性能的理论分析结果。
Experimental results show that the estimation error of snr and psnr is less than 1 db . according to this relationship , we design an adaptive insertion strategy that can be employed to embed watermarks in natural images with assigned snr or psnr 建立了分块dct变换域密信信号嵌入深度与含密图象客观降质评估量之间的关系，得到了可以实现恒降质信息隐藏的嵌入深度估计公式。
Results show that with preserving the appearance during the watermarking , the proposed scheme effectively improves the capacity and enhances the robustness of mesh watermarking . the icp algorithm is widely used for mesh alignment and registration 本文的外观水印算法在基本保持原始网格外观的基础上，能有效地提高网格水印的容量，并能取得与其他变换域水印算法相当的鲁棒性能。
