The new extended JPEG coder with variable quantizer using block wavelet transform

This paper describe the new extended JPEG coder with variable quantizer using the block wavelet transform which has more flexibility in representing the image dye to a pyramid-like multiresolution decomposition. We replace the discrete cosine transform (DCT) module by block-wise discrete wavelet transform (BDWT) module while keeping all the building blocks of the JPEG extension coder. In addition, we generate the variable quantization matrix (Q-matrix) based on the human visual system (HVS) and utilize the activity of the each block to control the bit and image quality. The simulation results show that the proposed scheme has substantially better performance than the JPEG extensions.