| Paper: | IMDSP-P2.2 | ||
| Session: | Restoration | ||
| Time: | Tuesday, May 18, 13:00 - 15:00 | ||
| Presentation: | Poster | ||
| Topic: | Image and Multidimensional Signal Processing: Image and Video Filtering | ||
| Title: | HIDDEN MARKOV TREE IMAGE DENOISING WITH REDUNDANT LAPPED TRANSFORMS | ||
| Authors: | Laurent Duval; Institut Français du Pétrole | ||
| Truong Nguyen; University of California, San Diego | |||
| Abstract: | Hidden Markov trees (HMT) wavelet models have demonstrated superior performance in image filtering, by their ability to capture features across scales. Recently, we proposed to extend the HMT framework to the Lapped Transform domain, where Lapped Transforms (LT) are M-channel linear phase filter banks. When the number of channels is a power of 2, the block partition provided by LT is remapped to an octave-like representation, where an HMT is able to model the statistical dependancies between intra- and inter-band coefficients. Due to better energy compaction and reduced aliasing properties, LT outperforms discrete wavelet transforms at moderate noise levels, both subjectively and objectively. However, critically-decimated LT suffers from a lack of shift-invariance, resulting in a degraded performance. In this paper, we study the improvement of HMT modeling in the LT domain, combined with a redundant decomposition, in order to increase the performance for image denoising. | ||
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