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Occultamento degli errori di immagine
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ISBN10: 6208644623
ISBN13: 9786208644628
Publisher: Edizioni Sapienza
Published: Feb 12 2025
Pages: 92
Weight: 0.30
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Italian
ISBN13: 9786208644628
Publisher: Edizioni Sapienza
Published: Feb 12 2025
Pages: 92
Weight: 0.30
Height: 0.22 Width: 6.00 Depth: 9.00
Language: Italian
Gli errori di trasmissione in JPEG2000 possono essere raggruppati in tre classi principali, a seconda dell'area interessata: LL, alte frequenze ai livelli di decomposizione inferiori e alte frequenze ai livelli di decomposizione superiori. Il primo tipo di errori è il più fastidioso, ma può essere nascosto sfruttando il segnale a livello spaziale; il secondo tipo di errori è meno fastidioso, ma più difficile da nascondere; il terzo tipo di errori è spesso impercettibile. Questo libro intende affrontare il problema della dissimulazione degli errori quando vengono danneggiati i piani di bit elevati, proponendo un nuovo approccio basato sulla teoria delle proiezioni su insiemi convessi; di conseguenza, gli effetti dell'errore vengono mascherati applicando interattivamente due procedure: il filtraggio passa-basso (LP) nel dominio spaziale e il ripristino dei coefficienti wavelet non corrotti nel dominio della trasformazione. È stato osservato che un filtraggio LP uniforme portava ad alcuni effetti collaterali indesiderati che compensavano negativamente i vantaggi. Questo problema è stato superato applicando una soluzione adattiva, che sfrutta una mappa dei bordi per scegliere la dimensione ottimale della maschera del filtro.
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