Image coding using vector quantization of wavelet coefficients

Abstract

In this paper, we introduce a new image compression scheme that it involves three steps: First a multiresolution decomposition of the images is performed using the Wavelet Transform (WT). A thresholding algorithm is then used for the wavelet coefficients. Finally, the coefficients derived from the second step are vector quantized using a multiresoltuion codebook. The LGB algorithm is used for the Vector Quantization (VQ). Our experimental results showed that the Lena image can be coded by a two-level system at the rate of 0.24 bpp having a PSNR of 30.40 db.