余弦

Second order incident boundary condition on fixed incident boundary is derived for numerical simulations, based on the cnoidal or sinusoidal motions of wave maker paddle, which shows that the prediction with second order incident boundary condition is more accurate than the prediction with first order incident boundary condition. 2 The analytical solution for higher-order Boussinesq equations is derived and its applicable range is discussed. 3 A 2-D fully non-linear numerical model using boundary element method is developed to obtain wave forces acting on rectangular obstacle. 4 The three-dimensional fully non-linear waves are studied in a numerical wave tank using finite element method.The studies on the coupled numerical model combined Boussinesq equations with Laplace equation are following.

非耦合非线性波浪计算模型：1 根据造波板做椭圆余弦运动或正弦运动速度，推导出数值模拟波浪水槽时固定入射边界上的二阶波浪入射边界条件，数值计算结果和实验结果的对比表明采用二阶入射边界条件对波面升高的预报比采用一阶入射边界条件对波面升高的预报更为精确；2 推导了波浪水槽造波板做正弦运动所产生波浪的高阶Boussinesq方程摄动展开解析解，讨论了该解析解的适用范围；3 对整个波浪水槽应用边界元方法数值模拟了波浪对物体的非线性作用；4 用有限元法求解三维Laplace方程模拟了三维完全非线性波浪水槽。

Four segment vector quantizers of the local cosine transform coefficients are employed, and Linde-Gray-Buzol algorithm is applied to design the codebooks.

对局部余弦变换系数采用分维矢量量化方法进行量化，码书设计采用LGB算法。

VC prepared by an image processing procedures : it can transform the image, including Fourier transform, Discrete Cosine Tr...

用VC编写的一个图像处理的程序：它可以实现图像的变换，包括傅立叶变换、离散余弦变换和沃什变换。

Fourier transform, discrete cosine transform, orthogonal transformation code.

傅立叶变换，离散余弦变换，正交变换的代码。

At present,the research of digital watermarking focused on discrete fourier transform domain, Discrete cosine transform domain, Discrete wavelet transform domain and others, but its robustness need to be improved.

目前，对于频域数字水印技术的研究主要集中于离散傅里叶变换域、离散余弦变换域和离散小波变换域等，但其鲁棒性能都有待提高。

Adaptive filtering ; time-domain LMS ; discrete Fourier transform ; discrete cosine transform ; discrete wavelet transform

自适应滤波；时域LMS ；离散Fourier变换；离散余弦变换；小波变换

VC do image processing procedures, including tensile contrast, Fourier transform, discrete cosine transform, and so on Wiener filter.

用VC做的图象处理程序，包括对比度拉伸，傅立叶变换，离散余弦变换，维纳滤波等等。

This paper mainly discussed the design of the image transform technology, which includes the analyse of the algorithms about fourier transform, discrete cosine transform and radon transform, proposed new improved algorithms, detailed di...

本文重点论述了图像变换技术部分的设计，对其中的傅立叶变换、离散余弦变换和Radon变换算法都做了详细的分析，提出了改进的算法，并详细论述了图像变换模块的设计过程，最后通过实例对各算法进行了具体说明。

These math operations involve not only the simple plus, minus, and multiplication operation but also the function of signal analysis such as Fast Fourier Transform and Discrete Cosine Transform.

这些数学运算从简单的加减法和乘法到复杂滤波以及信号分析功能如快速傅立叶变换和离散余弦变换都具有显著的优势。

This paper is to VisualC++ tool for digital image processing techniques, the basic theory, algorithm modules, thus realize thorough understanding of the basic function of image processing, including images of gray histogram equalization, image transformation, the Fourier transform and discrete cosine transform, the image enhancement processing low-pass filter high-pass filter and transformation.

本文是以VisualC++为工具，对数字图像处理技术的基本理论、模块算法做了深入的了解，从而实现图像处理基本功能，其中包括图像的灰度变换，直方图均衡，图像傅里叶变换和离散余弦变换，图像增强处理中的低通滤波和高通滤波变换。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。