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National Repository of Grey Literature

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Video Watermarking Zlomek, Martin ; Pelikán, Josef (advisor) ; Doubek, Petr (referee) Nazev prace: Watermarking videa Autor: Martin Zlomek Katedra (ustav): Kabinet software a vyuky informatiky Vedouci diplomove prace: RNDr. Josef Pelikan e-mail vedouci'ho: josef.pelikan@mff.cuni.cz Abstrakt: Navrzeny a implementovany byly tfi ruzne metody pro watermarking video sekvencf, ktere jsou komprimovany podle standardu H.264. Dve z techto metod reprezentujf metody, ktere watermark vkladaji ve frekvencni oblasti, zati'mco tfeti path' mezi metody, ktere watermark vkladaji do obrazove oblasti. Vkladani watermarku ve frekvencni oblasti probiha zmenou transformacnich koeficientu, ktere jsou ziskany pri'mo z komprimovaneho proudu dat. Watermark, ktery ma byt vlozen v obrazove oblasti, je pred vlozenim do techto koeficientu nejprve transformovan do frekvencnioblasti. Dale byl navrzen a implementovan obecny watermarkovaci system, ktery poskytuje jednoduche rozhrani usnadnujici implementaci konkretnich metod. Odolnost navrzenych metod vuci ruznym utokum byla provefena a vzajemnc porovnana sadou nekolika testu. Testy simuluji nasledujici utoky: rekompresi, zmenu mefitka, ofezani, zbaveni sumu, zasumeni, rozmazani, zaostfeni, mnohonasobne vkladani watermarku a tzv. konspiracni utok. S ohledem na robustnost a viditelnost watermarku v obraze je metoda, ktera watermark vklada do obrazoveoblasti, preferovana pfed... Detailed record

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