Regularity-constrained pre- and post-filtering for block DCT-based systems

  title={Regularity-constrained pre- and post-filtering for block DCT-based systems},
  author={Wei Dai and Trac D. Tran},
  journal={IEEE Trans. Signal Processing},
It is well known that the traditional block transform can only have at most one degree of regularity. In other words, by retaining only one subband, these transforms, including the popular discrete cosine transform (DCT), can only capture the constant signal. The ability to capture polynomials of higher orders is critical in smooth signal approximation, minimizing blocking effects. This paper presents the theory, design, and fast implementation of regularity constrained pre-/post-filters for… CONTINUE READING
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