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.
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.
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.
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.
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.
该文根据离散余弦变换(DCT)和量化运算的特点，提出了一种新的用于低比特率视频编码的全零块预先判别方法。
A new method for predetermination of all-zero blocks in low rate video coding is proposed, which is based on characters of discrete cosine transform (DCT) and quantization.
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.
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.
实验结果表明，该算法具有较好的图像复原质量和较快的编码速度，整体性能明显优于EZW方案（特别是低比特率下）。
The experiment results show that the new still image compression scheme provides higher perceptual quality and less encoding time than EZW, especially at low bit rates.
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.
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.
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.
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.
本次系统实现了基于AMBE2000的低速率语音通信，该芯片采用改进的多带激励(MBE)算法，能实现可变速率低比特率、高语音音质的语音压缩编码。
This system realized a voice communication system based on the AMBE2000, this chip USES the MBE algorithm to obtain low changeable communication rate, and high speech quality.
仿真实验结果表明，所提出的图像编码方法是一种高效的图像压缩算法，其压缩效果明显优于SPIHT等编码方法(特别是低比特率下)。
The experiment results show that the new still image compression scheme provides higher perceptual quality and higher PSNRs than SPIHT etc., especially at low bit rates.
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.
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.
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.
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