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
Este artigo descreve um método de projeto de bancos de filtros modulados em cosseno (CMFB's) para uma codificação eficiente de imagens. Enquanto o CMFB apresenta vantagens de baixo custo de projeto e implementação, os filtros de sub-banda do CMFB não possuem propriedade de fase linear. Isto impede o emprego de uma extensão simétrica no processo de transformação e leva a uma degradação do desempenho da compressão da imagem. No entanto, uma extensão suave proposta recentemente alivia o problema com CMFBs. Como resultado, pode-se esperar que CMFBs bem projetados sejam bons candidatos para um bloco de transformação em aplicações de compressão de imagens. Neste artigo, apresentamos uma nova abordagem de design de CMFBs regulares. Depois de introduzir uma restrição de regularidade nos parâmetros de rede de um filtro protótipo em CMFBs paraunitários (PU), também derivamos uma condição de regularidade para CMFBs de reconstrução perfeita (PR). Finalmente, projetamos PUCMFB e PRCMFB regulares de 8 canais por uma otimização irrestrita dos parâmetros da rede residual, e vários resultados de simulação para imagens de teste são comparados com várias transformadas para avaliar o codificador de imagem proposto baseado nos CMFB com um grau de regularidade. Além disso, mostramos a complexidade computacional dos CMFB's projetados.
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Toshiyuki UTO, Masaaki IKEHARA, Kenji OHUE, "A Novel Design of Regular Cosine-Modulated Filter Banks for Image Coding" in IEICE TRANSACTIONS on Fundamentals,
vol. E92-A, no. 7, pp. 1633-1641, July 2009, doi: 10.1587/transfun.E92.A.1633.
Abstract: This paper describes a design method of cosine-modulated filter banks (CMFB's) for an efficient coding of images. Whereas the CMFB has advantages of low design and implementation cost, subband filters of the CMFB do not have linear phase property. This prevents from employing a symmetric extension in transformation process, and leads to a degradation of the image compression performance. However, a recently proposed smooth extension alleviates the problem with CMFB's. As a result, well-designed CMFB's can be expected to be good candidates for a transform block in image compression applications. In this paper, we present a novel design approach of regular CMFB's. After introducing a regularity constraint on lattice parameters of a prototype filter in paraunitary (PU) CMFB's, we also derive a regularity condition for perfect reconstruction (PR) CMFB's. Finally, we design regular 8-channel PUCMFB and PRCMFB by an unconstrained optimization of residual lattice parameters, and several simulation results for test images are compared with various transforms for evaluating the proposed image coder based on the CMFB's with one degree of regularity. In addition, we show a computational complexity of the designed CMFB's.
URL: https://global.ieice.org/en_transactions/fundamentals/10.1587/transfun.E92.A.1633/_p
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@ARTICLE{e92-a_7_1633,
author={Toshiyuki UTO, Masaaki IKEHARA, Kenji OHUE, },
journal={IEICE TRANSACTIONS on Fundamentals},
title={A Novel Design of Regular Cosine-Modulated Filter Banks for Image Coding},
year={2009},
volume={E92-A},
number={7},
pages={1633-1641},
abstract={This paper describes a design method of cosine-modulated filter banks (CMFB's) for an efficient coding of images. Whereas the CMFB has advantages of low design and implementation cost, subband filters of the CMFB do not have linear phase property. This prevents from employing a symmetric extension in transformation process, and leads to a degradation of the image compression performance. However, a recently proposed smooth extension alleviates the problem with CMFB's. As a result, well-designed CMFB's can be expected to be good candidates for a transform block in image compression applications. In this paper, we present a novel design approach of regular CMFB's. After introducing a regularity constraint on lattice parameters of a prototype filter in paraunitary (PU) CMFB's, we also derive a regularity condition for perfect reconstruction (PR) CMFB's. Finally, we design regular 8-channel PUCMFB and PRCMFB by an unconstrained optimization of residual lattice parameters, and several simulation results for test images are compared with various transforms for evaluating the proposed image coder based on the CMFB's with one degree of regularity. In addition, we show a computational complexity of the designed CMFB's.},
keywords={},
doi={10.1587/transfun.E92.A.1633},
ISSN={1745-1337},
month={July},}
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TY - JOUR
TI - A Novel Design of Regular Cosine-Modulated Filter Banks for Image Coding
T2 - IEICE TRANSACTIONS on Fundamentals
SP - 1633
EP - 1641
AU - Toshiyuki UTO
AU - Masaaki IKEHARA
AU - Kenji OHUE
PY - 2009
DO - 10.1587/transfun.E92.A.1633
JO - IEICE TRANSACTIONS on Fundamentals
SN - 1745-1337
VL - E92-A
IS - 7
JA - IEICE TRANSACTIONS on Fundamentals
Y1 - July 2009
AB - This paper describes a design method of cosine-modulated filter banks (CMFB's) for an efficient coding of images. Whereas the CMFB has advantages of low design and implementation cost, subband filters of the CMFB do not have linear phase property. This prevents from employing a symmetric extension in transformation process, and leads to a degradation of the image compression performance. However, a recently proposed smooth extension alleviates the problem with CMFB's. As a result, well-designed CMFB's can be expected to be good candidates for a transform block in image compression applications. In this paper, we present a novel design approach of regular CMFB's. After introducing a regularity constraint on lattice parameters of a prototype filter in paraunitary (PU) CMFB's, we also derive a regularity condition for perfect reconstruction (PR) CMFB's. Finally, we design regular 8-channel PUCMFB and PRCMFB by an unconstrained optimization of residual lattice parameters, and several simulation results for test images are compared with various transforms for evaluating the proposed image coder based on the CMFB's with one degree of regularity. In addition, we show a computational complexity of the designed CMFB's.
ER -