A Robust Watermarking Approach by Using Balanced Incomplete Block Design
碩士 === 國立臺北大學 === 通訊工程研究所 === 95 === Digital watermarking is a kind of technique by which information can be embedded into digital contents. In recent years, digital contents are extensively used, especially over the Internet. Digital copyright protection thus becomes a more and more serious problem...
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| Format: | Others |
| Language: | en_US |
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2007
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| Online Access: | http://ndltd.ncl.edu.tw/handle/25871144098121461828 |
| Summary: | 碩士 === 國立臺北大學 === 通訊工程研究所 === 95 === Digital watermarking is a kind of technique by which information can be embedded into digital contents. In recent years, digital contents are extensively used, especially over the Internet. Digital copyright protection thus becomes a more and more serious problem. Digital watermarking may be a good solution due to its robustness and invisibility. This study aims to present a new watermarking approach base on the balanced incomplete block designs (BIBD). The watermark is embedded into the high frequency wavelet coefficients of an original image. Characteristics of human visual system are used to control the watermark strength. At the receiver site, the original image is used to extract the embedded watermark, and then the mathematical structure of the BIBD is used to identify the copyright date. Robustness is achieved by utilizing the mathematical structure of the BIBD. Because of the invisibility and big capacity of information are both satisfy, this approach is adaptable to cover communication.
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