查询词典 quantizer

According to the existing communication bandwidth of sensor nodes, the quantizer and the encoder used to wavelet compression are selected.

依据节点的可用通信带宽确定量化位和编码方法，并设计算法选择待传输的高频小波系数，自适应地调整传感数据的压缩率。

"Grain Quantitative Quantizer" is precise device to measure the percentage of the various conponents under the microscope.

本文介绍的"数字式颗粒定量仪"是用于显微镜下对各种成分含量百分比测定的精密仪器。

Because quantizer has not existed at optimizing gain filter, the quantization SNR can not be used to evaluate its performance.

但是，由于考察增益预测器时量化器还不存在，因此无法用量化信噪比评价滤波器性能。

More detailed content of this dissertation are as follows In the second section the definition of vector quantizer is firstly given. Then the features of conventional codebook design algorithm are briefly presented.

本文的绪论部分对相关技术作了充分的回顾，其后的内容如下：第二章首先介绍矢量量化器的定义，接着简要给出常用的码本设计算法的特点，最后讨论矢量量化器的设计与实现。

First, we have designed an effective method independent of quantizing signal noise rate in evaluating the performance of gain filter. This provides a way to compare and evaluate different optimizing schemes before gain quantization, forms a way of independent research between gain predictor and gain quantizer.

第一，提出了一种不依赖量化信噪比评价增益滤波器性能的方法，可在增益量化之前直接比较评价增益预测器的各种优化方案，形成了增益预测器与增益量化器分别独立进行优化的方法。

Some important transform coefficients of the original image are firstly mapped into the nearest neighboring lattice points by using lattice vector quantizer, then watermark signal is added to the lattice points.

基于格矢量量化的图像水印：本文提出了基于格矢量量化的多比特盲水印算法，不需要原始图象就可以实现水印信号的检测和译码。

In Chapter 2, a detailed survey on digital image watermarking is presented. InChapter 3, an optimal scheme is proposed to use Human Visual System model tocompute masking function. It will be used to control the strength of watermark signalfor optimal embedding. In Chapter 4, we propose a novel watermarking scheme based on lattice vectorquantization. Some important transform coefficients of the original image are firstlymapped into the nearest neighboring lattice points by using lattice vector quantizer,then watermark signal is added to the lattice points.

本文讨论了数字图像水印及其在多媒体安全中的应用，主要围绕下列问题进行研究和创新：1、优化的水印嵌入模型：本文对基于直接序列扩频技术的水印算法进行了改进，根据人类视觉系统感知模型，提出了优化的水印嵌入模型，在不可感知性条件的限制下，使水印的鲁棒性达到最高。2、基于格矢量量化的图像水印：本文提出了基于格矢量量化的多比特盲水印算法，不需要原始图象就可以实现水印信号的检测和译码。

The thesis also gives the estimated upper bounds of error decision probability. When the compressor is confined to be a lattice vector quantizer, a explicit mathematic equation for the rate of the performance convergence to the optimum is derived. On the other hand, Distortion Ratio Aproachs to the design of testing system on the basis of vector quantization are put forward, and methods for building the variable length decision tree as well as the fixed length one presented.

在算法方面，提出了失真比矢量量化检验器的设计方法以及可变长和固定码长分类判决树的生成算法；为了解决以矢量量化器为核心的处理系统运算量大，不易实时实现的问题，论文中引入了熵减的概念，在此基础上提出一种快速最近邻搜索编码方法，理论分析及实验结果均证实了这种算法的有效性。

A continuously variable slope delta modulation codec is implemented, in which step size of the quantizer is syllabically adapted according to the slope of the input signal. The CVSD codec poses least hardware complexity and offers excellent noise immunity.

连续可变斜率增量调制是一种性能良好的音节压扩自适应增量调制，非常适合语音信号的编解码，其硬件实现简单，抗噪声能力强。

Secondly, the author has researched the wavelet coefficients distribution property based on the histgram of detail subimages, and proposed an adaptive image quantization algorithm according to local data distribution in every subimage. In this quantization procession, every subimage will be disparted to some sub-blocks, and the sub-blocks will be quantized with different quantizer according the coefficients distribution; when the bias is large, the sub-block will be quantized with high accuracy; when the bias is little, the sub-block will be quantized coarsely.

其次，作者通过对小波高频子带图像系数分布直方图的分析研究，根据高频子带图像中绝大多数系数的幅度很小、幅度大的系数出现的几率很小的特点，提出了一种基于子带图像局部数据分布特征的自适应量化算法：先把高频子带图像分成较小尺度子块，子块系数离散性越大，采用精度越高的量化器：子块系数分布越集中，使用精度较低的量化器。

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。