基于全相位IDCT滤波器的内插重采样分层编码技术

A Hierarchical Coding Technique Based on All Phase IDCT Interpolation

该文提出了一种基于全相位逆离散余弦变换(APIDCT)内插滤波器的重采样分层编码技术。全相位数字滤波器(APDF)是一种新型的线性相位滤波器。该文给出了APIDCT的设计方法,并通过比较几种APDF的性能,证明APIDCT在图像内插方面性能优异。在此内插方法基础上,结合重采样和自适应算术编码形成了分层图像编码技术,这种技术算法简单,适用于空间可分级编码。实验结果表明仅用其中3层,重建图像的峰值信噪比和压缩率就可达到略优于JPEG的效果,并且压缩率高时也不会出现块效应。

This paper proposes a hierarchical coding technique based on the All Phase Inverse Discrete Cosine Transform (APIDCT) interpolation. The All Phase Digital Filter (APDF) is a new type of linear phase filter. This paper compares the performances of several kinds of APDF and demonstrates that the APIDCT filter has the best performance in image interpolation. By combining the interpolation filter with multi-subsampling and adaptive arithmetic coding, a simple hierarchical image coding method is shaped up. This technique can be used to scalable coding in spatial resolution. Simulation results show that the compression ratio and restored image quality better than JPEG compression can be achieved by only three layers, and no block effect is found even in high compression ratio.