查询词典 cosine wave

Pairs of images FFT transform and inverse transform example, discrete cosine transform and cosine inverse transform.

详细说明：对图像进行FFT变换和反变换的例子，离散余弦变换和余弦反变换。

This procedure according to the formula to achieve the inverse discrete cosine transform, you can write your own validation of discrete cosine transform is correct, understanding the formula help.

详细说明：这个程序根据公式实现了离散余弦逆变换，可以验证自己编写的离散余弦变换是否正确，对理解公式有帮助。

MDCT (Modified Discrete Cosine Transform) and IMDCT (Inverse Modified Discrete Cosine Transform) are two of the most complex computation modules.

改进离散余弦变换与其反变换是当今主流音频压缩标准中普遍采用的时频变换单元，也是计算量最密集的模块之一。

In every period, do the following operations:# For each 8*8 block, do the discrete cosine transform, then take out direct current coefficient in each block, using the transformation above for each DC coefficient, the gold stands for the code of the spread-spectrum we use when embedding the different watermark bit in different frames, after all of the watermark information which we want to embed is embedded, then do the inverse discrete cosine transformation, and store the current frame in a new file.

于是利用DCT变换域的这点重要的几何不变性，我们可以推导出一种能够抵抗几何攻击的视频水印算法，即将所需要嵌入的水印信息以127位扩频序列作为辅助，以求和值形式嵌入到DCT变换后的每个宏块的每个DC系数当中，具体嵌入和提取算法如下：根据使用的扩频序列的长度N，基于相关的嵌入器需要选取包含N帧的视频子序列，令这N帧视频子序列作为一个嵌入周期，对于每N帧视频子序列做如下的操作，#即对于每个8×8的像素块进行DCT变换，然后取出每个DCT变换后的直流分量，对于每个DC系数，做如上所述的变换，其中gold为在第k帧中嵌入第i位水印信息时使用的扩频码字值，待将所有需要嵌入的水印信息全部嵌入后，再做反DCT变换，保存当前帧。

In the method the discrete cosine transform DCT is first applied to noisy facial images to remove its high frequency component noise, the removed noisy face images can be obtain through performing inverse discrete cosine transform. Then the two dimensional principal component analysis (2DPCA) is exploited to the removed noisy face images to obtain a set of eigenvectors that have larger correspondent eigenvalues, and the features of images with lower information dimensions are extracted to get fast recognition speed.

这方法首先对具杂讯脸部影像进行离散余弦转换去除高频杂讯，取得低频影像以降低高频杂讯干扰，然后再对低频影像以二维主分量分析(2DPCA)撷取前几个较高特徵值所对应的一组特徵向量，以降维与资讯集中达到快速辨识的目的。

Program is divided into three parts: phase.m symbol of the baseband shaping pulse sequences, optional rectangular pulse, the square root raised cosine pulse and raised cosine pulse model.m-based procedures, completed a variety of base-band signal constellation mapping , pulse shaping and modulation command.m given spectrum shows a simple test.

程序分成三个部分：phase.m对基带码元序列进行脉冲成型，可选矩形脉冲，升余弦脉冲和平方根升余弦脉冲； model.m 为主程序，完成各种信号的基带星座图映射、脉冲成型和调制； command.m给出一个简单的频谱显示测试。

Based on the theory of cosine crossing point, the combination of three-sector approximate cosine crossing point and regulation sampling to compute trigger angle on line was given.

根据余弦交点法的原理，提出了三段近似余弦同步波和规则采样结合的一种在线计算触发延迟角的方法。

Based on cylinder and plane dual-cosine oscillating tooth gear transmission,deduce the 3D dual-cosine oscillating tooth gear transmission,and analysis its multi-tooth mesh characteristics.

在圆柱面及平面双余弦活齿传动基础上，推演出空间双余弦活齿传动，并对其多齿啮合特性进行了分析。

Firstly, in the frequency domain, differentiatial operator is decomposed into magnitude and phase operator, and the fractional order expressions of periodical signals, such as sine wave, cosine wave and complex exponent signal, are deduced.

首先，在频域中将微分算子分解为幅度算子和相们算子，导出正弦、余弦和复指数信号的分数阶微分表达式；然后考察矩形、三角形、梯形等常用周期信号的分数阶微分。

Secondly, the direct demodulation detection system of 8mm wave band 32-channel on the background of millimeter-wave focal plane imaging is built, according to millimeter-wave passive detection theory, at the same time, the principle experiment is carried out, and the basic theory of millimeter-wave detection are confirmed.

其次，根据被动毫米波探测理论搭建了以毫米波焦平面成像为应用背景的8mm波段32通道直接检波式探测系统，并进行了原理性实验，验证了被动毫米波探测的基本理论。

Diabetes is a social disease that affects several million people worldwide.

糖尿病是一个社会性疾病，全世界有数百万人罹患此病。

I'll call you on Friday to see if we can reschedule our luncheon meeting at your convenience.

我星期五会给您打电话在您方便的时候我们重新安排我们的午餐约会。