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Integracja SVD z transformacją falkową w znakowaniu wodnym wideo
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ISBN10: 6200725799
ISBN13: 9786200725790
Publisher: Wydawnictwo Nasza Wiedza
Published: Jul 22 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Polish
ISBN13: 9786200725790
Publisher: Wydawnictwo Nasza Wiedza
Published: Jul 22 2025
Pages: 64
Weight: 0.22
Height: 0.15 Width: 6.00 Depth: 9.00
Language: Polish
Cyfrowe znakowanie wodne to technika umieszczania znaku lub wzoru w dowolnym obiekcie multimedialnym w celu zapobieżenia jego nieuprawnionemu użyciu. Znak lub wzór, który ma zostac osadzony, nazywany jest znakiem wodnym i musi jednoznacznie wskazywac wlaściciela znaku wodnego. W niniejszej pracy przedstawiono technikę pólślepej cyfrowej znakowania wodnego wideo, slużącą do umieszczania niewidocznych znaków wodnych w celu wzmocnienia odporności, niewidoczności i bezpieczeństwa znaków wodnych osadzonych w znakowanym wideo. Wykorzystano polączenie dwóch transformacji matematycznych, a mianowicie dekompozycji wartości osobliwych i dyskretnej transformacji falkowej opartej na wlaściwości entropii. Znak wodny jest osadzany w klatce wideo na podstawie wlaściwości entropii zastosowanej do warstw klatki w obszarach o wysokiej entropii. W ten sposób entropia sluży do zwiększenia niewidoczności znaku wodnego w filmie. Aby uzyskac odpornośc znaku wodnego, zastosowano dyskretną transformację falkową. Jakośc filmu jest utrzymywana dzięki zastosowaniu dekompozycji wartości osobliwej. Dekomponuje ona macierz klatki na trzy ortogonalne macierze osobliwe, a następnie znak wodny jest osadzany w jednej z tych trzech macierzy. W ten sposób jakośc jest odpowiednio utrzymana.
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