A Dct-based Embedded Image Coder Using Wavelet Structure Of Dct For Very Low Bit Rate Video Codec

This paper presents an efficient DCT-based embedded image coder designed for I(Intra)-frame coding in very low bit rate video codec. Motivated by the recognition that a DCT 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 embedded zerotree coding. Simulation results show the better rate-distortion performance than conventional H.263 as well as EZW-style coders.