英语翻译由于信息技术的蓬勃发展,远程教育正处于以计算机网络和多媒体技术为基础的第三代远程教育阶段,即网络教育阶段.在网络

英语翻译
由于信息技术的蓬勃发展,远程教育正处于以计算机网络和多媒体技术为基础的第三代远程教育阶段,即网络教育阶段.
在网络教育实践中,由于图像信息具有直观、形象、易懂和信息量大等特点,因此在远程教育实践中得到了最广泛的应用而且无疑具有举足轻重的作用.虽然图像信息有着许多的优点,但也存在不可回避的潜在问题,其中一个主要问题就是其数据量过于庞大.大数据量的图像信息会给存储器的存储容量,通信干线信道的带宽,以及计算机处理速度增加极大的压力,对远程教育实践而言也是具有重大的影响的,会造成通信堵塞、网络延迟、语音图像不同步等一系列问题.因此,需要在保持原图像中包含的本质信息的基础上,对通信和存储时必需的数据进行压缩.利用图像压缩,可以减轻图像存储和传输的负担,使图像在网络上实现快速传输和实时处理.
有关图像压缩编码的国际标准很多,基于离散小波变换为主的多分辨率编码方式JPEG2000是目前静态图像中压缩比最高图像质量最好的,但也有不足之处,主要体现在编解码时间较长,重构图像边缘有毛刺,不平滑等.本文对JPEG2000压缩算法进行了初步的研究并尝试对其进行改进.

Due to the rapid development of information technology,distance education is in a computer network and multimedia technology-based stage of the third generation of distance education,that is,network education.
Educational practice in the network,as the image information with visual images,such as easily understood and informative features,and therefore the practice of distance education has been the most widely used and undoubtedly plays a decisive role.Although the image information has a lot of advantages,but there are also potential problems that can not be evaded,one of the main problems is that too large amount of data.Large amount of data will give the image information storage memory,communications bandwidth channel trunk,as well as greatly increase computer processing speed of the pressure on the practice of distance education is also of great impact will be caused by communication congestion,network delay,images are not synchronized voice problems.Therefore,the need to maintain the original image information contained in the basis of the nature of communications and the need to store compressed data.The use of image compression,image can reduce the burden of storage and transmission,so that the image on the network for rapid transmission and real-time processing.
Of the image compression coding a lot of international standards,based on the discrete wavelet transform-based multi-resolution JPEG2000 encoding is the static image compression ratio of the highest image quality,but there are also deficiencies,mainly in a long time codec ,Reconstruction of the image edge burr,such as non-smooth.JPEG2000 compression algorithm in this article to a preliminary study carried out and try to improve it.