中文摘要：

星云图和MPEG-4中运动补偿后得到的残差图像通常是点线奇异性明显的图像.小波变换是表示点奇异性的有效工具,脊波变换（ridgelet）是表示线奇异性的理想工具.该文基于二者的优点提出了一种基于脊波变换和小波变换的混合编码框架用来处理压缩点线奇异性明显的图像.实验结果表明这种混合编码可以有效地对点线奇异性明显的图像进行编码,其效果优于基于单独的小波变换的SPIHT编码和脊波变换的SPIHT编码.

英文摘要：

Galaxy images and motion compensated images in MPEG-4 are typically zero-dimensional and linear singularities images. Wavelet transform is a powerful instrument in catching zero-dimensional singularities. Ridgelet are a powerful instrument in catching and representing mono-dimensional singularities in bidimensional space. Based on their strongpoint we propose an adaptive hybrid video coder scheme using ridgelet and wavelet transform that compresses zero-dimensional and linear singularities images. Experimental results show that the adaptive hybrid video coder scheme can effectually code zero-dimensional and linear singularities images, performs much better than separately the Compression Algorithm using FRIT with Modified SPIHT and the Compression Algorithm using wavelet Transformation with Modified SPIHT.