Título: | SUB-BAND IMAGE CODING | ||||||||||||
Autor: |
EDMAR DA COSTA VASCONCELLOS |
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Colaborador(es): |
WEILER ALVES FINAMORE - Orientador |
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Catalogação: | 05/JUL/2006 | Língua(s): | PORTUGUESE - BRAZIL |
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Tipo: | TEXT | Subtipo: | THESIS | ||||||||||
Notas: |
[pt] Todos os dados constantes dos documentos são de inteira responsabilidade de seus autores. Os dados utilizados nas descrições dos documentos estão em conformidade com os sistemas da administração da PUC-Rio. [en] All data contained in the documents are the sole responsibility of the authors. The data used in the descriptions of the documents are in conformity with the systems of the administration of PUC-Rio. |
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Referência(s): |
[pt] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=8635&idi=1 [en] https://www.maxwell.vrac.puc-rio.br/projetosEspeciais/ETDs/consultas/conteudo.php?strSecao=resultado&nrSeq=8635&idi=2 |
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DOI: | https://doi.org/10.17771/PUCRio.acad.8635 | ||||||||||||
Resumo: | |||||||||||||
This work focus on the problem of image compression, with
exploring the techniques of subband coding.
The basic structure, used in the sirst part of this tesis,
encompass the uniform decomposition of the image into 16
subbands. This procedure aims at reproducing the reults of
Woods [1]. The component of the 16 subbands are quatized
and coded and bits are optimally allocated among the
subbands to minimize the mean-squared error. The
quantizers desingned match the Generelized Gaussian
Distribuition, which model the subband components.
In the coding process, the lowest subband is DPCM coded
while the higher subbands are coded with PCM.
As an innovation, it is proposed the use of the algorithm
LZW for coding without error (compaction) the quantized
subbands.
In the compactation process, the Huffamn and LZW
algorithms are used. The simulation results are presented
in terms of rate (bits/pel) versus peak signal-to-noise
and subjective quality. The performance of the subband
decomposition tecnique obtained with the Huffamn´s
algorithm is about 2dB better than that obtained with the
LZW. The universality of the Lempel-Ziv algorithm is,
however, an advantage that leads us to think that further
investigation should still be pursued.
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