Synthesis filter bank with low memory requirements for image subband coding
I. Sundsbø, T.A. Ramstad · 1998
One of the factors that makes subband coding seem less attractive for image processing compared to transform coding, is the extensive memory requirements for 2-D filtering. In this paper we present a filtering method that significantly lowers the memory requirements. A parallel, uniform and separable filter bank with 8 channels in each dimension is considered. It is shown that by a data reordering and a minor structural change to the filter bank, a blockwise filtering is made possible, thus reducing the total memory to 192 B registers and 9 KB RAM for an image of size 1152/spl times/1920 pixels.