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Digital image watermarking
Číka, Petr ; Krbilová, Izabela (referee) ; Makáň, Florian (referee) ; Němec, Karel (advisor)
Digital image watermarking has developed for the purpose of protecting intellectual property rights to multimedia data. The focus of this thesis is searching for an alternative solution of digital image watermarking methods. A detailed analysis of watermarking methods particularly in the frequency domain, and the modification of these methods are the main aim of this work. Improved performance in watermark extraction is one of the main goals. First, the common static image watermarking methods, possible attacks on the watermarked data and techniques for objective measurement of watermarked image quality are shortly introduced. Techniques which use the space domain for watermarking ar described in the next part of this work. It is about techniques which insert the watermark into the least significant bits of an image both in the RGB domain and in the YUV domain. The main part of the thesis depicts modified and newly developed static image watermarking methods in the frequency domain. These methods use various transforms and error-correction codes, by means of which the watermark robustness increases. All the methods developed are tested in MATLAB. Results together with tables and graphs are one part of work. The end of the thesis is devoted to a comparison of all the developed methods and their evaluation.
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Design and Implementation of a Codec for Iwadari Code
Křivánek, Jan ; Drábek, Vladimír (referee) ; Sekanina, Lukáš (advisor)
This thesis deals with the design, the implementation and oncoming testing of circuits implementing the encoder and the decoder of the Iwadari code with universal correction ability. The design according to the theory of forward error correction systems is well-founded by mathematic modeling. Describing of the implementation prefers VHDL language. The implemented encoder and decoder were simulated in specialized development environments to verify their correct operation. Final demonstrational physical implementation of testing connection of the encoder and the decoder in experimental educational platform FIT-kit was made to show their function and mechanism.
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Design and Implementation of a Codec for Iwadari Code
Křivánek, Jan ; Drábek, Vladimír (referee) ; Sekanina, Lukáš (advisor)
This thesis deals with the design, the implementation and oncoming testing of circuits implementing the encoder and the decoder of the Iwadari code with universal correction ability. The design according to the theory of forward error correction systems is well-founded by mathematic modeling. Describing of the implementation prefers VHDL language. The implemented encoder and decoder were simulated in specialized development environments to verify their correct operation. Final demonstrational physical implementation of testing connection of the encoder and the decoder in experimental educational platform FIT-kit was made to show their function and mechanism.
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Digital image watermarking
Číka, Petr ; Krbilová, Izabela (referee) ; Makáň, Florian (referee) ; Němec, Karel (advisor)
Digital image watermarking has developed for the purpose of protecting intellectual property rights to multimedia data. The focus of this thesis is searching for an alternative solution of digital image watermarking methods. A detailed analysis of watermarking methods particularly in the frequency domain, and the modification of these methods are the main aim of this work. Improved performance in watermark extraction is one of the main goals. First, the common static image watermarking methods, possible attacks on the watermarked data and techniques for objective measurement of watermarked image quality are shortly introduced. Techniques which use the space domain for watermarking ar described in the next part of this work. It is about techniques which insert the watermark into the least significant bits of an image both in the RGB domain and in the YUV domain. The main part of the thesis depicts modified and newly developed static image watermarking methods in the frequency domain. These methods use various transforms and error-correction codes, by means of which the watermark robustness increases. All the methods developed are tested in MATLAB. Results together with tables and graphs are one part of work. The end of the thesis is devoted to a comparison of all the developed methods and their evaluation.
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