Abstract: 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.Integrating the characteristic of Lifting Wavelet Transform and DCT transform，the thesis advanced a new scheme.Experiments show that the PSNR value is more than that of the original SPIHT at the same bit rate.

Key words: Lifting Wavelet Transform, DCT transform, SPIHT algorithm

摘要： 针对小波变换和多级树集合分裂图像编码具有浮点数运算、算法复杂等特点，采用整数实现的提升格式代替了原来的小波变换，并结合提升小波变换和DCT变换的特点，提出了一种改进方案。仿真结果表明，在相同的较低比特率情况下，与原算法相比，峰值信噪比有明显提高，取得了更优的压缩效果。

关键词: 提升小波变换, DCT变换, SPIHT编码算法