The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. ex. Some numerals are expressed as "XNUMX".
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The original paper is in English. Non-English content has been machine-translated and may contain typographical errors or mistranslations. Copyrights notice
La plupart des images naturelles sont bien modélisées sous forme de zones lissées segmentées par des bords. Les zones lisses peuvent être bien représentées par une transformée en ondelettes avec une grande régularité et avec moins de coefficients ce qui nécessite des filtres passe-haut avec quelques moments de fuite. Cependant, pour les régions situées autour des bords, des filtres passe-haut courts sont préférables. Dans une approche récemment proposée, ce problème a été résolu en changeant de banque de filtres en utilisant des filtres plus longs pour les zones lissées des images et des filtres plus courts pour les zones avec bords. Cette approche a été appliquée au codage d’images avec perte, entraînant une réduction des artefacts de sonnerie. Comme les contours étaient prédits à l’aide des pixels voisins, les transformations non linéaires ont rendu la décorrélation plus flexible. Dans cet article, nous proposons un banc de filtres variant dans le temps et l'appliquons au codage d'images sans perte. Dans ce schéma, nous estimons l'écart type des pixels voisins du pixel actuel en résolvant le problème du maximum de vraisemblance. Le banc de filtres est commuté entre trois bancs de filtres, en fonction de l'écart type estimé.
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Masahiro OKUDA, Sanjit K. MITRA, Masaaki IKEHARA, Shin-ichi TAKAHASHI, "Filter Banks with Nonlinear Lifting Steps for Lossless Image Compression" in IEICE TRANSACTIONS on Fundamentals,
vol. E84-A, no. 3, pp. 797-801, March 2001, doi: .
Abstract: Most natural images are well modeled as smoothed areas segmented by edges. The smooth areas can be well represented by a wavelet transform with high regularity and with fewer coefficients which requires highpass filters with some vanishing moments. However for the regions around edges, short highpass filters are preferable. In one recently proposed approach, this problem was solved by switching filter banks using longer filters for smoothed areas of the images and shorter filters for areas with edges. This approach was applied to lossy image coding resulting in a reduction of ringing artifacts. As edges were predicted using neighboring pixels, the nonlinear transforms made the decorrelation more flexible. In this paper we propose a time-varying filterbank and apply it to lossless image coding. In this scheme, we estimate the standard deviation of the neighboring pixels of the current pixel by solving the maximum likelihood problem. The filterbank is switched between three filter banks, depending on the estimated standard deviation.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/e84-a_3_797/_p
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@ARTICLE{e84-a_3_797,
author={Masahiro OKUDA, Sanjit K. MITRA, Masaaki IKEHARA, Shin-ichi TAKAHASHI, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={Filter Banks with Nonlinear Lifting Steps for Lossless Image Compression},
year={2001},
volume={E84-A},
number={3},
pages={797-801},
abstract={Most natural images are well modeled as smoothed areas segmented by edges. The smooth areas can be well represented by a wavelet transform with high regularity and with fewer coefficients which requires highpass filters with some vanishing moments. However for the regions around edges, short highpass filters are preferable. In one recently proposed approach, this problem was solved by switching filter banks using longer filters for smoothed areas of the images and shorter filters for areas with edges. This approach was applied to lossy image coding resulting in a reduction of ringing artifacts. As edges were predicted using neighboring pixels, the nonlinear transforms made the decorrelation more flexible. In this paper we propose a time-varying filterbank and apply it to lossless image coding. In this scheme, we estimate the standard deviation of the neighboring pixels of the current pixel by solving the maximum likelihood problem. The filterbank is switched between three filter banks, depending on the estimated standard deviation.},
keywords={},
doi={},
ISSN={},
month={March},}
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TY - JOUR
TI - Filter Banks with Nonlinear Lifting Steps for Lossless Image Compression
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 797
EP - 801
AU - Masahiro OKUDA
AU - Sanjit K. MITRA
AU - Masaaki IKEHARA
AU - Shin-ichi TAKAHASHI
PY - 2001
DO -
JO - IEICE TRANSACTIONS on Fundamentals
SN -
VL - E84-A
IS - 3
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - March 2001
AB - Most natural images are well modeled as smoothed areas segmented by edges. The smooth areas can be well represented by a wavelet transform with high regularity and with fewer coefficients which requires highpass filters with some vanishing moments. However for the regions around edges, short highpass filters are preferable. In one recently proposed approach, this problem was solved by switching filter banks using longer filters for smoothed areas of the images and shorter filters for areas with edges. This approach was applied to lossy image coding resulting in a reduction of ringing artifacts. As edges were predicted using neighboring pixels, the nonlinear transforms made the decorrelation more flexible. In this paper we propose a time-varying filterbank and apply it to lossless image coding. In this scheme, we estimate the standard deviation of the neighboring pixels of the current pixel by solving the maximum likelihood problem. The filterbank is switched between three filter banks, depending on the estimated standard deviation.
ER -