A Middle Frequency Compensation Scheme For Wavelet Transform Coding

To overcome the degradation problem existed in conventional wavelet transform coding, this paper presents a new approach for still image compression. The approach is based on the concept of middle frequency compensation scheme [l] and combines the zerotree coding and the Vector Quantization (VQ) technique for middle frequency compression. The proposed approach can improve the JPEG method over 2.8dB for 0.25bpp. Also, the result is substantially better than the embedded zerotreeof wavelet (EZW) coding [2] which can achieved a compression ratio of 33.17dB for 0.25 bpp in which the adaptive arithmetic coding is included.