摘要
对SPIHT进行了研究,提出了基于9-7整数小波变换的改进的SPIHT。它首先对图像进行整数小波分解,然后对低频子带图像采用DPCM预测编码,对高频子带改变扫描方式来获得最大系数和按照频率优先的原则输出系数。实验结果表明算法在相同的输出码率情况下不仅得到了更好的恢复效果,而且缩短了编码时间。
ARer the research of SPIHT, an improved SPIHT algorithm on the basis of 9-7-tap integer wavelet transform was presented. At first, image is decomposed by using integer wavelet, then the low-frequency sub-image wavelet coefficients were processed by using predictive coding. Meanwhile, the high-frequency ones were changed scanning mode to obtain the biggest coefficient and used frequencypriority to export the coefficients. The result shows the image compressed effectively via high PSNR was obtained in the same output bit rate, and processing time is reduced.
出处
《计算机工程与设计》
CSCD
北大核心
2006年第5期884-886,共3页
Computer Engineering and Design
