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PSUEDO REVERSIBLE SYMMETRIC EXTENSION FOR LIFTING-BASED NONLINEAR-PHASE PARAUNITARY FILTER BANKS
![](https://sigport.org/sites/default/files/styles/home/public/BoundaryProcess_K3_.png?itok=g_sCAtbg)
- Citation Author(s):
- Submitted by:
- Taizo Suzuki
- Last updated:
- 15 September 2017 - 4:30am
- Document Type:
- Poster
- Document Year:
- 2017
- Event:
- Presenters:
- Taizo Suzuki
- Paper Code:
- ICIP1701
- Categories:
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This study presents a pseudo reversible symmetric extension (P-RevSE) that solves the signal boundary problem of lifting-based nonlinear-phase paraunitary filter banks (L-NLPPUFBs), which have high compression rates thanks to their not having a constraint on the linear-phase property unlike the existing transforms used in image coding standards. The conventional L-NLPPUFBs with a periodic extension (PE) yield annoying artifacts at the signal boundaries. However, the P-RevSE is implemented smoothly at the signal boundaries by using a nonexpansive convolution of a symmetric extension (SE) and determinant control for the lifting factorization. Although the determinant control causes a pseudo SE, not a true SE, the resulting L-NLPPUFB with P-RevSE outperforms not only the L-NLPPUFB with PE but also the current transform used in JPEG XR.