查询词典 numeric coding

The experiment results show that SP-frames have lower coding efficiency than P-frames and significantly higher coding efficiency than Ⅰ-frames, and provide functionalities that usually unachieved with P-frames, at the same time greatly reduce bit cost.

从实验结果可知，SP帧的编码效率尽管略低于P帧，但却远远高于Ⅰ帧，而且提供的功能P帧是不具有的，同时大大降低了码流开销。

BACE algorithm has the desired property that does not reduce the encoding efficiency of the CABAC entropy encoder compared to the CIME algorithm for CAVLC entropy encoder. Both CIME and BACE algorithms can adapt to the content security level by choose the amount and different key parts of the video stream to be encrypted, the theoretical and experimental results show that both these algorithms can effectively encrypt the video content. Due to the ability of encrypting the video content without violating the syntax, the BIME and BACE algorithms can be employed used for many advanced H.264/AVC coding options without first decrypting the video stream, like Data Partition and UnEqualized Protection for the enhancement of transmission robustness, and the scalable coding in order to match the different channel capacity.

上述两种结合了H.264/AVC熵编码器特征的内容选择性加密算法，由于其加密后的视频码流的句法结构完全符合H.264/AVC视频编码标准，与传统的基于块数据的块加密算法相比较，本文提出的两种内容加密算法可以使得加密后码流在无需解密的情况下，实现H.264/AVC视频编码标准为移动视频应用而设计的诸多特性，如：增强传输鲁棒性的数据分割技术和非均衡保护技术，以及直接做匹配信道带宽的分级编码操作等，具有更高的灵活性和计算效率，从而可以灵活运用于各种应用场合。

A character-codes model based pattern recognition method by using amplitude data of targets frequency response is proposed after the establishment of high frequency response equation of radar targets. The method uses the same unvariant character-codes to express the same target of different angles and uses sequential separating of regions of target's reference variables to obtain multiple coding vectors of all regions for every target. The category and pose of target can be determined after a two-staged classification processing such as coding processing of target range profile data and errors correcting processing of coded data. The two-stage classification results are used to target identification as posterior hypothesis to be tested by sufficient convincing and necessary convincing. The character-codes model based pattern recognition method is also adaptive to variation of target angles and controllable in error probability. Time-consuming and complicated iterative computation is not necessary in the train process of pattern recognition.

首先建立了雷达目标的高频频率响应方程，这种方程将目标多散射中心理论与目标局部谐振理论有机地结合起来；进而提出了目标多频响应结构成像方法，这种方法将瑞利区频率响应或谐振区频率响应曲线的不同部位用各种不同的近似方法去逼近，通过特征谱估计方法将目标的局部频响特征与宽带距离响应特征结合起来；然后提出了一种基于姿态角变化区域的序贯划分与多模匹配的特征编码识别方法，这种方法具有能适应目标姿态角的变化以及能控制识别的差错概率α等优点，在目标识别时只需要目标在少数有限个频率激励下的幅频响应数据。

After the analysis of the algorithms model of MPEG-2 AAC, the thesis optimizes some blocks with great computation of Psychoacoustic Model, Filter banks and Quantization coding, etc. It omits some function blocks which have much computation and avail little to the gain of coding, for example, prediction in time domain, TNS, etc. It also adopts some fast algorithms to reconstruct some model for the reason of real time characteristic.

在对 MPEG-2 AAC算法模型进行分析之后，对心理声学模型，滤波器组和量化编码模块等计算量较大的模块进行优化，同时也省略了部分运算量大但对编码效果增益不明显的几个模块，如时域预测和 TNS 等，并使用了一些快速计算技术对算法模型进行实时化改造。

Based on this, this project firstly extensively studies, optimizes and ameliorates the key algorithm in coding -DCT and the movement estimation algorithm, so as to implement fast coding and the high compression ratio.

基于此，本课题首先对编码中的关键算法——DCT变换和运动估计算法进行重点研究、优化和改进，以实现快速的编码和高压缩比。

Three commixed still image coding algorithms are proposed based on them and such ideas as: zerotree coding, WMSE (which is based on mankind visual characteristics), classified vector quantization with different vectorstructures and classification methods.

首先回顾了矢量量化的基本原理和一般算法，对小波变换结合矢量量化技术的特点作出分析和总结。

Chapter 5 investigates the CWP-MC-CDMA system performance concatenating with space-time coding and Turbo coding.

论文第五章研究了级联空时编码和Turbo码的CWP-MC-CDMA系统及性能。

Based on this, we employ the Turbo code as channel code, and present a CWP-MC-CDMA system concatenating with space-time coding and Turbo coding, and give corresponding system model and principle analysis.

在此基础上，我们采用Turbo码作为信道编码，提出一种级联空时编码和Turbo码的CWP-MC-CDMA系统，给出相应的系统模型和原理性分析。

Based on the analysis of short-time calm characteristics of audio signal educing from produce-mechanism of audio signal , and the Linear Prediction coding technology , the basic principle of Code-Excited Linear-Prediction coding is discussed .

本文在分析了由语音信号的产生机理所得出的短时平稳特性的基础上，利用线性预测编码技术，分析了码激励线性预测编码的基本原理。

A new Wavelet Image Coding method based on Predictive Quadtree-split is proposed in this paper. This method hybridizes the intra-band and inter-band coding.

1引言小波变换有很强的去相关能力，但各频带内部以及各频带之间的小波系数还存在一定的相关性，如何利用这种相关性是小波变换图像编码的关键。

Pachomius manual labour was organized as an essential part of the monastic life; and since it is a principle of the monks as distinguished from the mendicants, that the body shall be self-supporting, external work of one sort or another has been an inevitable part of the life ever since.

根据圣pachomius体力劳动组织作为一个重要组成部分寺院生活；以来，这是一个原则的和尚，作为有别于乞丐，该机构应自支撑，对外工作的这种或那种已一个必然的一部分，生活至今。

In order to study the effects of parametrical rolling on the ship movement and tilts, in allusion to ship's navigating in regular following waves, the equation of ship rolling motion is transformed into normal Mathieu equation by proper variable replacement when strong parametrical excitation in restoring moment varied according to sine or cosine wave.

为研究参数横摇对船舶运动和倾覆的影响，通过对船在规则波上随浪航行时，恢复力矩中出现的1个以正余弦规律变化的强参数激励项进行适当的变量置换，将船舶的横摇运动方程转换成标准形式的Mathieu方程。