Research on discrete cosine transformation coding and its persent and feature
Zhu Ren-yi · Journal of China Institute of Communications · 2004
DCT(Discrete Cosine Transform) transforming coding has been widely used in such coding-standards as JPEG、MPEG and H.26x excluding of JPEG2000 at present. With the embedded image coding using zerotree of wavelet coefficients introduced by Shapiro and the successful application based on set partitioning in hierarchical trees by Said entered into the new phase on the video/image compressing coding. However ,Xiong et al have applied the high correlation between DCS by means of a DCT-based embedded image coding and the same multiresolution characteristics as the wavelet transforming after reorganizing the DCT coefficients transformed. DCT by a suitable coding scheme can provide requirements for transmission of image signal in terms of a fine granularity scalability in the internet. Besides, all those based on EZHDCT、SA-DCT、TR-DCT、RS-DCT and MRDCT have improved the conventional DCT transforming coding further to a higher stage. DCT transforming would have further enlarged it抯 an applying scale and leaving more room based on the conventional DCT after the being reorganized DCT coefficients and by the aid of some improved transformations .Object-based coding for DCT is a promising technique for next-generation coding .All mentioned above have been studied deeply in this paper.