Improvement of SPIHT algorithm based on lifting scheme
基于提升小波的SPIHT改进算法

Due to the computational complexity of SPIHT, the integer-to-integer lifting scheme, which could simplify the computational process, was adopted instead of the normal wavelet transform. Wavelet coefficients were divided into blocks, based on which the spatial orientation trees were re-organized. The context-based model was constructed according to the correlativity of neighboring coefficients in blocks, and the outputting signals were encoded by adaptive arithmetic code to improve coding efficiency. Experiments show that the PSNR value is more than that of the original SPIHT at the same bit rate.