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|a eng
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|a 621.372.852.1
|h PREGRADE KONAČNE DEBLJINE. VALOVODNI FILTERI
|j FILTERI
|e 621.372.852
|9 1065
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|9 30517
|a Vrankić, Miroslav
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|a Two-dimensional adaptive perfect reconstruction filter banks using lifting scheme = Dvodimenzionalni adaptivni filtarski slogovi s potpunom rekonstrukcijom realizirani metodom podizanja :
|b master thesis = magistarski rad /
|c Miroslav Vrankić ; [mentor Damir Seršić]
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|a Zagreb :
|b N. Vrankić ; Fakultet elektrotehnike i računarstva,
|c 2003.
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|a X, 123 str. :
|b ilustracije ;
|c 30 cm +
|e CD
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|a Bibliografija str. 113-115.
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|a Ključne riječi: wavelet filtarski slogovi, waveleti druge generacije, multirezolucijska analiza, adaptivna shema podizanja, quincunx polifazno razlaganje, neseparabilni filtri, interpolacijski filtri, rekonstrukcija slike s gubicima.
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|a More efficient coding, modelling and image analysis generate the need for search for better methods of the multiresolution image analysis, i.e. for more efficient wavelet filter bank structures. This thesis is based on a previous research of one-dimensional filterbankstructuresthathadthepossibilitytoadaptfilterparameterstotheproperties of the analyzed signal. In this thesis we present the construction of a two-dimensional adaptive wavelet filter bank that is based on a lifting scheme. The filter bank is nonseparable, based on a quincunx polyphase decomposition and nonseparable filters. The lifting scheme has beenchosensinceitallowsforaneasyconstructionofspacevaryingfilterbankswitha perfectreconstructionproperty. Theproposedfilterbankadaptstotheanalyzedimage foreverypixelinalldecompositionlevelswhilestillpreservingthegoodpropertiesof the wavelet decomposition. A number of vanishing moments is guaranteed by the fixed part of the filter bank. Without degrading the overall filter bank properties, the variable part can be changed in order to adapt to the analyzed image. The paper explores various one-dimensional and two-dimensional adaptation methods based on the least squares criterion. Adaptation results have been shown for a number of synthetic and real-world images. Effects of lossy image reconstruction and impact of filter coefficients’ quantization to the efficiency of the image decomposition have been presented.
Keywords: wavelet filter banks, second generation wavelets, multiresolution analysis, adaptive lifting scheme, quincunx polyphase decomposition, nonseparable filters, interpolating filters, lossy image reconstruction
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|4 ths
|9 9580
|a Seršić, Damir
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