摘要
由于数字媒体的不断普及,DCT编码在JPEG,MPEG,H.26x等编码标准中有着越来越广泛的应用。但随着Shapiro关于小波的嵌入式零树小波编码以及Said等人提出的集合分裂等级树编码的成功应用,图像及视频信号的压缩编码迎来了一个新的阶段,这显然对传统DCT编码提出了挑战。然而,Xiong等人利用嵌入式DCT块变换之间直流系数(DC)的高度相关性也能获得较高的编码性能,因为对DCT后的系数进行重组,同样具有小波多分辨率图像的特性。文中主要提出DCT与DWT的比较,以及基于DCT与小波变换在图像中的性能比较。
DCT transforming coding has been widely used coding standards such as JPEG, MPEG and H. 26x due to the development of digital media. The compressing codings for image video signals have been advanced to a new stage since the EZW had been introduced by Shapiro and the SPIHT applied by Said et al, which are a competitive challenge against the conventional DCT＇ s coding. However,DCT＇ s coefficients have a similar multiresolutional attributes after reorganizing its datum like wavelet transforming. The paper mainly tell about the comparison of DC＇T and DWT in the image manipulation.
出处
《计算机技术与发展》
2006年第9期79-81,84,共4页
Computer Technology and Development
