说明：  通过调整小波系数的排序过程，用一维数组代替原有的链表结构，改变小波系数的重要性判断依据等措施对原有的SPIHT算法进行改进。
(By adjusting the wavelet coefficients of the sorting process, using one-dimensional array instead of the original list structure, the importance of changing the wavelet coefficients and other measures to determine the basis of the original SPIHT algorithm has been improved.)