查询词典 DWT

Then the digital audio signal is set into segments and DWT is performed. Finally the modulated signal is embedded in the coefficients with relatively large absolute value on middle frequency range detail signal adaptively. The original digital audio signal is necessary when detecting the watermark.

在应用扩频技术的算法中，首先将视觉上可辨的二值水印图像降维为一维序列，再将一维水印序列伪随机排序并与m序列作扩频调制，最后对数字音频信号进行分段离散小波变换，把经过调制的水印信息自适应地嵌入到原音频信号小波分解中等尺度绝对值较大的分量上。

Combining the definition of CWT and the derivative property of convolution, we constructed a general method to calculate the approximate derivative of signal through CWT by using the first and second derivative of Gaussian function, Haar, and the first derivative of three-order-Spline function as wavelets. As compared with the other approaches of calculating derivative, which include the numerical differentiation, polynomial filters, Fourier transform, and the recently proposed DWT method, fast calculation and simple mathematical operation were remarkable advantages of CWT method. For the signal corrupted by severe noise (Signal-toNoise Ratio=5), the satisfactory results could also obtained via CWT method through appropriately adiusting the dilations.

在此基础上，(1)结合连续小波变换的特点和卷积的微分性质，提出了使用Gaussian函数的一阶和二阶导数，Haar和三次样条函数的一阶导数作为小波函数的连续小波变换计算信号近似导数的一般性方法，与其他导数计算方法(包括数字微分法，多项式滤波法，Fourier变换法和离散小波变换法)相比，本法简单便捷，计算速度快，对于噪声含量较高的信号(S/N为5)，只要适当调节尺度即可获得比较满意的结果。

It measures weight quickly and accurately and displays weight is gram, avoirdupois ounce, troyounce, or penny weight, totally 4 units.

它迅速测量重量并且准确地和显示克、盎司、ozt 或 dwt ， 4 个计量单位。

Bulk cement truck, concrete mixer truck, the former dump concrete mixer, lime powder carrier, silt materials transport vehicles, dust dump truck, crane bucket truck, dump trucks, such as suitable for a variety of engineering construction, metallurgy , electricity and other industries, according to users need to provide different types of transport vehicles and dwt.

散装水泥车、混凝土搅拌运输车、前卸式混凝土搅拌车、石灰粉运输车、粉粒物料运输车、粉尘自卸运输车、吊斗式自卸车、翻斗车等适合于各种工程建设、冶金、电力等行业，根据用户需要提供不同车型及载重吨位的运输车辆。

The DIONE is a 75,172 dwt Panamax dry bulk carrier built in 2001. The previous time charter contract for the DIONE was at the gross charter hire rate of US$28,500 per day.

DIONE轮2001年建造，75172载重吨，此期租合同签约前该船总计日租金为28500美元。

The algorithm is in the context of DCT and DWT, watermarks will be embedded the intermediate frequency coefficient of DCT domain.

首先从信息隐藏技术产生的背景出发，概括了数字水印技术的框架、特性、性能、算法、应用以及发展动态。

While embedding watermarking, the watermarking sequences are produced by the chaos system,and are embedded into the low frequent coefficient of DWT domain to guarantee the robustness of watermarking.

该技术在水印嵌入时，由混沌系统生成水印序列，并在离散小波变换的低频子带上嵌入水印，保证了水印的鲁棒性。

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。

The AAL North Asia service currently employs four modern multi-purpose tween deckers 30,000 dwt vessels and the AAL South East Asia service also employ four multi-purpose tween deckers but slightly smaller in capacity which is at 23,000 dwt.

这些船只特别适宜于装载成套的件杂货，钢铁，重机械，车辆及集装箱。澳亚北亚船只的船吊更是能操作重达200吨的大件货物，澳亚东南亚船只的船吊也可操作78吨的重物。

Free living marine nematodes are the most dominant group, accounting for 89.702% of the abundance of meiofauna, with benthic harpacticoid copepods in the second, accounting for 4.193%.

小型底栖动物的平均生物量和生产量分别是(1120.72±487.21)μg dwt 10cm~(-2)和(10086.49±4384.85)μg dwt 10cm~(-2) a~(-1)。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。