Optimized perfect reconstruction tree-structured filter banks for image coding
Ilangko Balasingham, T.A. Ramstad · 2002
By employing nonuniform nonunitary filter bank in an image coder increased performance in terms of both theoretical and practical (PSNR) coding gains, and subjective quality can be obtained. One possible candidate is octave-band tree-structured filter banks. An optimized perfect reconstruction octave-band three-stage tree-structured filter bank is proposed. The filter coefficients are optimized at each stage for subband coding gain. The performance of the proposed filter bank outperforms both traditional octave-band three-stage tree-structured filter banks and parallel filter banks in terms of both PSNR and visual quality.