计算机技术与发展
計算機技術與髮展
계산궤기술여발전
COMPUTER TECHNOLOGY AND DEVELOPMENT
2014年
5期
146-149
,共4页
音频水印%零水印%离散余弦变换%鲁棒性%系数符号
音頻水印%零水印%離散餘絃變換%魯棒性%繫數符號
음빈수인%령수인%리산여현변환%로봉성%계수부호
audio watermark%zero-watermark%discrete cosine transform%robustness%coefficients symbol
为了解决现有音频水印算法透明性与鲁棒性之间的矛盾，提出了一种基于DCT系数符号的音频零水印算法。算法按水印尺寸对时域音频数据做等长分帧，求取每帧数据的绝对值平均值，依次按时序做离散余弦变换( DCT)。算法选取数值最大的DCT系数，利用水印属性与最大DCT系数符号做异或运算，得到水印密钥，实现了零水印的嵌入。实验结果表明该算法可以很好地抵抗各类常规的信号处理破坏，水印鲁棒性较强。
為瞭解決現有音頻水印算法透明性與魯棒性之間的矛盾，提齣瞭一種基于DCT繫數符號的音頻零水印算法。算法按水印呎吋對時域音頻數據做等長分幀，求取每幀數據的絕對值平均值，依次按時序做離散餘絃變換( DCT)。算法選取數值最大的DCT繫數，利用水印屬性與最大DCT繫數符號做異或運算，得到水印密鑰，實現瞭零水印的嵌入。實驗結果錶明該算法可以很好地牴抗各類常規的信號處理破壞，水印魯棒性較彊。
위료해결현유음빈수인산법투명성여로봉성지간적모순，제출료일충기우DCT계수부호적음빈령수인산법。산법안수인척촌대시역음빈수거주등장분정，구취매정수거적절대치평균치，의차안시서주리산여현변환( DCT)。산법선취수치최대적DCT계수，이용수인속성여최대DCT계수부호주이혹운산，득도수인밀약，실현료령수인적감입。실험결과표명해산법가이흔호지저항각류상규적신호처리파배，수인로봉성교강。
In order to solve the contradiction between the transparency and the robustness in the existing audio watermark algorithm,a zero-watermark algorithm based on DCT coefficients processing is proposed. The audio is split into equal frames based on size of watermark, and then calculate the average of the absolute value of each frame and using the average do DCT. The algorithm selects the maximum val-ue of the DCT coefficient,applying the watermark characteristic and maximum value of DCT coefficient for XOR operation to get water-mark key,accomplishing the zero-watermarking embedded. The experimental results show that the algorithm is a strong watermark ro-bustness which can be very good resistance to various types of conventional signal processing.
