In this paper , we summarize and compare the previous method of image data compression , analyze and give a method of jpeg image encoder - decoder based on dct 本文主要工作是跟踪研究iso / iec推出的新一代静止图像压缩标准jpeg2000 ，使用该标准实现图像压缩和解压缩问题。
Mpeg - 4 is a popular standard of moving picture compression encoding today . delivering mpeg - 4 video on narrow - band networks , we can gain video with high quality Mpeg - 4是当今比较流行的一种动态图像压缩编码标准，采用该压缩标准，可以在很窄的带宽下传输高质量的图像。
Namespace to read and write data with the gzip compression and decompression standard , described in the ietf rfc 1951 and rfc 1952 specifications , which are available at the 命名空间中的类以gzip压缩和解压缩标准读写数据， ietf rfc 1951和rfc 1952规范描述了该标准，可在
In recent years , with the development and spread of many compression standard ( jpeg , mpeg , h . 261 , etc ) , compressed image was used more and more popular and widely 近年来，随着许多压缩标准(如jpeg 、 mpeg 、 h . 261等)的制定和推广，压缩格式的图象使用越来越普遍和广泛。
Together , i try to compare this kind of design plan of video compression / decompression system based on wavelet transform with other international video compression standard in many respects 并将这种基于小波变换的视频压缩解压缩方案与其它国际通用的视频压缩标准从很多方面进行比较。
The image compression standard in pacs now is the jpeg standard based on the dct ( discrete cosine transform ) algorithm , which can only be applied in the limited areas 目前在pacs系统中较多采用的是jpeg图像压缩标准，该标准采用以离散余弦变换算法为主的区块编码方式,但有一定的局限性。
H . 264 offers significantly better video compression efficiency than the previous itu - t standards and mpeg standards , but its computational complexity is too large for implementation H . 264的三个主要目标之一是提高编码效率,在同样的保真度条件下,平均码率比现有的h . 263视频压缩标准低50 % 。
For this reason , image and video compression standards have been developed to eliminate picture redundancy , allowing information to be transmitted and stored in a compact and efficient manner 所以，只有发展通用的、效率较高的视频压缩标准，才能缓解图像数据与有限的计算机资源之间的矛盾。
Secondly , the algorithms used in mpeg - 4 video compression standard are explored in detail , and we deeply study the algorithms including motion estimation , dct transform and quantification 其次，详细说明了mpeg ? 4视频压缩标准采用的算法，深入研究了运动估计、 dct变换、量化等算法并进行了优化。
The core algorithm of still image compression standard jpeg2000 are simulated with watcom c , including the algorithm of ebcot , the lifting wavelet transform and mq arithmetic coder 同时，本文还对静止图象压缩标准jpeg2000的核心算法进行了c语言实现，包括ebcot算法、小波提升算法、 mq算术编码器等。
