然而在低比特率，这种限制降低了编码器的性能。
At low bit rates, this restriction degrades the performance of the coder.
低比特率JPEG压缩图象往往产生严重的方块效应。
Low bit rate JPEG compressed images usually demonstrate serious blocking effects.
因此，在低比特率条件下的视频编码逐渐被人们重视。
Therefore, there is an increasing interest in video coding at such low bit rates.
结果显示较好解决了低比特率和高图像质量的一对矛盾。
The result shows that this system solves the contradiction between low bit-rat and high image quality better.
因此，在低比特率情况下的编码质量必须得到进一步改善。
Therefore, further coding improvements are required to reach an acceptable picture quality at these low bit rates.
提出一个用于低比特率视频编码的快速块匹配运动估计算法。
A fast block matching motion estimation algorithm for low bit rate video coding is proposed.
提出了一种有效的适用于甚低比特率视频编码的运动估计新技术。
This paper presents an efficient motion estimation technique for very low bit rate video coding.
本文设计并实现了一个基于DSP的低比特率视频压缩硬件平台。
This paper designs and realizes a low-bit video compression hardware platform based on DSP.
高清晰度，低比特率的图像压缩技术是研究井下电视的关键技术之一。
High quality, low bit rate image compression method is one of the key technologies to develop downhole video logging instrument.
本附件包括含有低比特率LD - CELP实现测试矢量的电子资料。
This annex includes electronic material containing low bit rate LD_CELP implementation test vectors.
本文回顾了近年来在低比特率图像压缩技术研究、开发及应用领域的简况。
The recent research, development and applications of low bitrate picture compression techniques are reviewed in this paper.
本发明提供了一种能够在低比特率时恢复高质量音频信号的音频编码与解码装置。
Provided are audio encoding and decoding apparatuses capable of recovering a high-quality audio signal at a low bit rate.
低比特率时，基于块离散余弦变换(BDCT)的图像压缩方法常常会引起块效应。
At low bit rates, the block Discrete Cosine Transform (BDCT) compression methods often give rise to blocking artifacts.
提出了一种在非常低比特率情况下具有高质量的图像编码技术——特征头像集编码方案。
This paper presents a video coding technique that achieves high visual quality at very low bit rates.
因此，人们不断地寻求新的编码方法，以求在低比特率的前提下，提供较高的语音质量。
Therefore, researchers in the related field are constantly seeking new coding method to provide a high quality voice at low bit rate.
这种算法是快速和近匀称(除了在低比特率方面)的，这使它适于实时交互式多媒体应用。
This algorithm is fast and near symmetric (except in very low bit rates), which makes it suitable for real-time interactive multimedia applications.
然而，基于DCT的传统视频压缩方法由于在低比特率下出现块失真严重影响恢复视频质量。
Unfortunately, in these situations, the notorious blocking artifacts resulting from block DCT set a severe limit on the achievable bit-rate with acceptable quality.
近几年来，视频编码的研究集中在两个方面，一是低比特率编码，二是基于对象的视频编码。
The research of video coding is mainly focused on two aspects in recent years, one is the very low-bit rate coding, the other is the video coding based on objects.
在低比特率音频感觉编码中，预回声失真更为突出，而对其处理的前提是瞬态信号的有效检测。
In perceptual audio coding with low bit rate application, the pre-echo artifact is more distinct, and the effective detection of transient signals is the precondition.
本文深入讨论和研究了低比特率通信系统中视音频信号的实时处理及优化技术，并进行了软件实现。
This paper deeply discuss the video and audio real-time processing technology and its optimize technology of low bits rate communication systems. The system has been realized with software.
设计中采用了DSP、低比特率语音压缩编解码、信道复用、快闪存储、串口和调制解调器通信等技术。
In this design many technologies such as DSP, low bit-rate speech compression, channel multiplexing, Flash Memory and communication with modem through se rial port are used.
因此，有必要继续深入研究视频图像的特点与压缩机理，以实现甚低比特率下视频图像实时传输的目标。
So it is necessary to further study the characteristics of video and compression mechanism deeply and to achieve live transmission of videos at very low bit rate.
本论文的研究来源于科研项目“低比特率多媒体远程教学系统”及“基于网上的视音频监控及报警系统”。
The research in this paper is based on the projects which are "A Low Bit Rate Multimedia Remote Instruction System" and "A Video-Audio Monitoring-Control and Alarm System".
块离散余弦变换在低比特率时其恢复图像的块边界上会出现明显可见的方块效应，从而降低了图像的视觉质量。
The block-Based Discrete Cosine Transform (BDCT) suffers from visible blocking artifacts between adjacent image blocks at low bit rates, which reduces the image visual quality.
视频序列的时域亚采样对于低比特率信道上的视频传输和存储空间受限条件下的视频存储具有十分重要的意义。
The temporal sub-sampling technique of the video sequence is very important for the video transmission in the low-bit-rate channel and the video storage in the limited storage space.
实验表明嵌入式零材编码方法可以用在非分离型二维子波变换情况，在低比特率时有很好的巅值信噪比PSNR。
The experiment shows that the embedded zerotree coding method can be used in the case of nonseparable wavelet transform and has good PSNR at low compression ratio.
首先，论文介绍了基于小波的视频编码器的基本原理，提出一种新的适用于低比特率压缩场景的视频编码器方案。
First, the theoretical foundations of wavelet based video coder as well as a new video coder for low bit rate video compression used in this research are presented.
并指出基于小波变换的SPIHT编码算法具有对水下图像低比特率编码性能好、可以与纠错技术结合使用等特点。
Our research has showed that SPIHT performs better than JPEG while the underwater images are coded in low bit rate. SPIHT also has a good progressive transmission characteristic.
在低比特率视频编码时，全零块的预先判断，能够有效地减少编码器的计算复杂性，是优化编码器常用的技术之一。
In the low rate video encoding process, predetermination of all-zero blocks which can be applied to reduce the computational complexity is a common method to optimize the software coder.
在低比特率视频编码时，全零块的预先判断，能够有效地减少编码器的计算复杂性，是优化编码器常用的技术之一。
In the low rate video encoding process, predetermination of all-zero blocks which can be applied to reduce the computational complexity is a common method to optimize the software coder.
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