A DCT-based embedded image coder using wavelet structure of dct for very low bit rate video codec

被引:0
作者
Jeong, YA
Cheong, CK
机构
[1] LG Corp, Inst Technol, DSP Gr, Seocho Gu, Seoul 137140, South Korea
[2] Hoseo Univ, Coll Engn, Dept Comp & Informat Engn, Asan, South Korea
关键词
D O I
10.1109/TCE.1998.713180
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
This paper presents an efficient DCT-based embedded image coder designed for I(Intra)-frame coding in very low bit rare video codec. Motivated by the recognition that a DCT (Discrete Cosine Transform) on NxN blocks of an image can be viewed as a wavelet decomposition with a uniform NxN-subband decomposition, the proposed coder rearranges the DCT transformed image into 2-level wavelet pyramid structure and makes use of improved embedded zerotree coding. The proposed rearrangment structure is quite well coupled with a embedded zerotree coding. Resulting DCT-based embedded image coder shows the better rate-distortion performance than conventional H.263 and MPEG4 as well as EZW-style coders. Also, the performance of the proposed new coder is comparable to that of state-of-art still image compression methods. In addition, embedded feature of the proposed coder makes it possible to encode I-frame at the exactly chosen bit I-ate.
引用
收藏
页码:500 / 508
页数:9
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