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Kontekstno komprimiranje slik : doktorska disertacijaGleich, DušanV doktorski disertaciji je opisana metoda za kontekstno komprimiranje slik, ki uporablja izgubno transformacijsko shemo. Metoda je sestavljena iz valčne transformacije, kvantizacije in entropijskega ... kodiranja. Kontekstna metoda uporablja modele pri kvantizaciji in entropijskemu kodiranju, ki so načrtovani z mehko logiko. Doktorska disertacija vključuje izboljšanje znane mrežne kvantizacije. Tukaj so uporabljena stanja mrežne kvantizacije, namesto mreže pa je uporabljena mehka logika za napoved stanja mreže kvantiziranega koeficienta. Načrtana so mehka pravila in funkcije pripadnosti tako, da je dosežen najmanjši srednji kvadratični pogrešek med originalno sekvenco in rekonstruirano sekvenco. Ta metoda se imenuje mehka metoda kvantizacije (MK). Kvantizirani indeksi se pretvorijo v bite s pomočjo bitnih ravnin. Biti se kodirajo z adaptvnim artimetičnim kodirnikom. V doktorski disertaciji je predlagana metoda za estimacijo pogojne verjetnosti, ki je potrebna za delovanje aritmetičnega kodirnika. Biti, ki so kodirani pred opazovanim bitom,so uporabljeni kot vhodne spremenljivke v mehko logiko, ki na podlagi pomembnosti posameznih bitov dodeli verjetnost kodiranemu bitu. Nova metoda se imenuje metoda z mehko kvantizacijo in mehkim kodiranjem ali krajše MKMC. V doktorski disertaciji je predlagana nova metoda, ki je kombinacija frekvenčno prostorske kvantizacije (SFQ) in MKMC in se imenuje mehko kodirana SFQ (FSFQ). Metode so ocenjene v objektivnem in subjektivnem merilu za optične slike in imajo učinkovitost, ki je primerljiva z metodami zadnjega stadija. Učinkovitost metod je v objektivnem smislu prikazana nad testnimi slikami SAR. Kakovost rekonstruiranih SAR slik je primerjana s histogrami. Najboljši rezultati v smislu kodirnega popačenja so dobljeni s FSFQ metodo, sledi pa ji MKMC metoda. Pri nižjih bitnih stopnjah pa metodi FSFQ in MKMC dajeta podoben vizualen vtis kakor metoda JPEG 2000.Type of material - dissertation ; adult, seriousPublication and manufacture - Maribor : [D. Gleich], 2002Language - slovenianCOBISS.SI-ID - 120350720
Author
Gleich, Dušan
Other authors
Čučej, Žarko |
Planinšič, Peter
Topics
valčna transformacija |
kodiranje signalov |
mehka logika |
mehka kvantizacija |
kontekstno kodiranje |
komprimiranje slik |
wavelet transform |
fuzzy logic |
fuzzy quantization |
context-based image coding |
entropy coding
Library | Call number – location, accession no. ... | Copy status |
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Library of Technical Faculties, Maribor | pisarna A-003 (FERI) DD GLEICH D. KONTEKSTNO | available - reading room |
University of Maribor Library | Skladišče II 55742 | available - reading room |
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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Database name | Field | Year |
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Links to authors' personal bibliographies | Links to information on researchers in the SICRIS system |
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Gleich, Dušan | 20862 |
Čučej, Žarko | 04778 |
Planinšič, Peter | 04799 |
Source: Personal bibliographies
and: SICRIS
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