Please use this identifier to cite or link to this item:
標題: 合併直序展頻與跳頻展頻之影像浮水印架構
Image Watermarks Combining Direct Sequence
作者: 張詠翔
Chang, Yung-Hsiang
關鍵字: Watermark;影像浮水印
出版社: 電機工程學系
展頻通訊區分為直接序列展頻(Direct Sequence Spread Spectrum DSSS)與跳頻展頻(Frequency Hopping Spread Spectrum FHSS)二種,因此,我們針對這二種展頻技術而設計。並融合跳頻展頻與直序展頻的Combine-S Watermarking技術。Combine-S Watermarking可同時擁有跳頻展頻浮水印與直序展頻浮水印的優點,我們藉由調整Slow DSSS Watermarking與Slow FHSS Watermarking的比例抵抗不同的影像攻擊,藉此可以抵抗較多種的破壞,達到提高數位浮水印強韌度之目的。
最後我們得到Slow DSSS Watermarking與Slow FHSS Watermarking採用2:8的比例,可以抵抗大多數的攻擊,而且取出的浮水印仍有一定品質,因此2:8是一個可接受且優良的比例分配。

With the rapid growth of Internet, information exchange is getting more and more convenient. As it is so easy to obtain others information in the networks, the issues of the privacy and copyright protection become more important to prevent unauthorized access.
In the thesis, we developed two watermarking techniques using spread-spectrum technique. The watermarking technology can be viewed as a communication system. The watermark was the signal to be transmitted. The frequency domain of the original image was the transmission channel. The attacks were regarded as channel noise. There were two methods to implement the spread-spectrum system: direct- sequence spread- spectrum (DSSS) and frequency-hopping spread-spectrum (FHSS). Based on these two methods, we developed a method that combined FHSS Watermarking and DSSS Watermarking. We called the new method “combine-S Watermarking”. The experimental results proved that combine-S Watermarking had both the advantages of FHSS Watermarking and DSSS Watermarking. Therefore, combine-S Watermarking was more robust and can withstand many different attacks.
Appears in Collections:電機工程學系所

Show full item record

Google ScholarTM


Items in DSpace are protected by copyright, with all rights reserved, unless otherwise indicated.