The algorithm of VQ must be improved to reducing amount of calculation, increasing compression rate and steadying the quality of rebuilt image at same time.
通过对矢量量化图像编码算法进行改进，达到低运算量，高压缩比以及稳定的图像质量的目的。
Experiments show that the improved SPIHT algorithm could provide higher PSNR value than the original SPIHT algorithm at the same compression rate.
实验结果表明，SPIHT改进算法与原来的SPIHT算法相比，在相同的压缩比下可以获得更高的峰值信噪比。
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