A lossy image coding scheme for wireless multimedia sensor network

A simple, high-efficient and energy saving image coding scheme is proposed in this paper, which is suitable for wireless multimedia sensor network. The scheme is based on lifting wavelet transform and SPIHT algorithm. To solve the very low executing efficiency problem of the combined algorithm, we make improvements in two aspects. Firstly, by eliminating the computation and coding of the outmost high-pass coefficients, the energy consumption of the transform is reduced and the execution is speed up. Secondly, by using optimized quantization truncation pretreatment with high-pass subband coefficients, it is avoided that coding mass of small value coefficients of the high-pass subbands, which further improves the executing efficiency. The simulation results show up to 90% reduction in the executing time is achieved by choosing the optimized truncation threshold, with the guarantee for the image quality of 34.5dB.