3-D subband coding of video using recursive filter banks

A video coding technique based on a three-dimensional subband analysis with recursive spatial filter banks is proposed. Moreover a simple technique to compress digital data in the subbands is described. In order to avoid annoying artifacts at edges and thin lines the filter banks are switched adaptively. Flat areas are processed with recursive filters exhibiting long impulse responses and good selectivity, while object edges and other detailed regions are processed with recursive filters with highly attenuated impulse responses and poorer selectivity. For very simple encoding scheme good visual quality has been obtained for real test video sequences in the CIF format encode at the bitrates about 150 kbps. Obviously further bit rate reduction could be obtained using a more sophisticated coder. The very important advantage of the technique proposed is its simplicity.