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Higuchi, Tatsuo,Kawamata, Masayuki,Yoshie, Tomotaka 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
This paper proposes parallel separable (PS) two-dimensional (2-D) adaptive filters. Their adaptation algorithms are formulated and their computational complexities are estimated. They are applied to 2-D identification for comparison of the proposed adaptive filter and a conventional 2-D adaptive filter. A PS 2-D recursive adaptive filter and a 1PS 2-D non-recursive adaptive filter are realized in the form of the 2-D adaptive line enhancer, and they are applied for restoration of noisy images.
Higuchi, Tatsuo,Kawamata, Masayuki,Nagahisa, Masaki 대한전자공학회 1994 ISPACS:Intelligent Signal Processing and Communica Vol.1 No.1
Iterated Transformation Theory-Based Coding (ITTBC) suffers from very high computational complexity in encoding phase. This is due to its exhaustive search. This paper proposes Multi-resolution Tree Search ITTBC (MTS-ITTBC) to reduce the encoding complexity. MTS-ITTBC searches ITT-code using a multi-resolution search-tree. The computational load of MTS-ITTBC is O(NlogN), while that of full search ITTBC is O(N²), where N is the number of range blocks or domain blocks in an image. Numerical examples show that the encoding time of MTS-ITTBC can be reduced to 12% of that of the full search ITTBC, while the loss in quality relative to the full search ITTBC is about 0.5 dB in PSNR, which is visually negligible.