摘要
網路使生活更加便利，但方便之餘必有其脆弱之處，即容易被複製及偽造，所以保護智慧財產權就顯得格外重要，數位浮水印技術便是用來防止這個問題產生，且在多媒體共有情形下，雙重版權有其必要性。本研究結合視覺密碼學技術及快速傅立葉轉換(FFT)提出雙重音訊浮水印技術，首先將音訊利用快速傅立葉轉換(FFT)轉換至頻率域，再將雙重浮水印利用視覺密碼學技術產生兩張分享影像，然後將其中一張分享影像嵌入至音訊頻率域係數中，最後，嵌入完成後再進行快速傅立葉反轉換(IFFT)，以完成雙重音訊浮水印設計。印證時，萃取出分享影像，再利用視覺密碼學技術即可辨識雙重浮水印。
關鍵字：雙重音訊浮水印、視覺密碼學、快速傅立葉轉換
ABSTRACT
Internet makes our life more convenient, but with that comes some weaknesses: such as easy duplication and the counterfeit; therefore, the intelligence proprietary protection becomes critical issue. The digital watermarking technology can be used to prevent these weaknesses from occurring; also, most multimedia can have multiple ownerships, so, it’s a necessity to have dual copyright. This research proposes a dual audio watermarking technology that combines visual cryptography technology and Fast Fourier transform (FFT). The process transforms the audio into a frequency domain by FFT, then, uses the visual cryptography to generate two share images from two digital watermarking, then, embeds one share image into the frequency coefficients of the audio, finally, applies the inverse Fast Fourier transform (IFFT) to complete the dual watermarked audio design. When verifying the ownership, the share image can be extracted from the watermarked audio and verified the dual watermarking by applying the visual cryptography.
Keywords: Dual Audio Watermarking; Visual Cryptography; Fast Fourier Transform (FFT)
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