Research on Still Image Coding Method in MPEG-4
Lou Dong-sheng · Journal of Beijing Broadcasting Institute · 2002
Of coding methods about still image,JPEG is widely used and has had a good effect,in which the main technologies is DCT transform and Huffman entropy coding.But in latest international video compression standard such as MPEG-4 and JPEG2000,DCT transform is replaced by DWT transform.In this paper,firstly we'll compare DWT's advantage with DCT,then we'll show the course of still image coding in MPEG-4,finally we'll receive conclusion by comparing the images coded by JPEG and MPEG-4.