计算机工程与应用
計算機工程與應用
계산궤공정여응용
COMPUTER ENGINEERING AND APPLICATIONS
2010年
9期
88-91
,共4页
彩色图像%盲水印%离散小波变换%分块DFT%嵌入模板矩阵%Arnold置乱%相关性
綵色圖像%盲水印%離散小波變換%分塊DFT%嵌入模闆矩陣%Arnold置亂%相關性
채색도상%맹수인%리산소파변환%분괴DFT%감입모판구진%Arnold치란%상관성
color images%blind watermarking%Discrete Wavelet Transform(DWT)%Discrete Fourier Transform(DFT)%embedded template matrix%Arnold transform%correlation
为了扩大数字水印的适用范围,提出了一种彩色图像盲水印算法.在嵌入过程中,将宿主图像从RGB空间转换到YIQ空间,对其进行小波分解后再进行分块DFT变换,结合一个嵌入模板矩阵和两个伪随机序列,将Arnold置乱以后的二值图像水印嵌入到宿主图像中;在提取过程中,根据嵌入模板矩阵提取出嵌入到每一图像小块的序列,分别计算该序列和两个伪随机序列的相关性,根据相关性的大小关系恢复水印信息.实验结果表明,算法具有良好的不可见性和鲁棒性.
為瞭擴大數字水印的適用範圍,提齣瞭一種綵色圖像盲水印算法.在嵌入過程中,將宿主圖像從RGB空間轉換到YIQ空間,對其進行小波分解後再進行分塊DFT變換,結閤一箇嵌入模闆矩陣和兩箇偽隨機序列,將Arnold置亂以後的二值圖像水印嵌入到宿主圖像中;在提取過程中,根據嵌入模闆矩陣提取齣嵌入到每一圖像小塊的序列,分彆計算該序列和兩箇偽隨機序列的相關性,根據相關性的大小關繫恢複水印信息.實驗結果錶明,算法具有良好的不可見性和魯棒性.
위료확대수자수인적괄용범위,제출료일충채색도상맹수인산법.재감입과정중,장숙주도상종RGB공간전환도YIQ공간,대기진행소파분해후재진행분괴DFT변환,결합일개감입모판구진화량개위수궤서렬,장Arnold치란이후적이치도상수인감입도숙주도상중;재제취과정중,근거감입모판구진제취출감입도매일도상소괴적서렬,분별계산해서렬화량개위수궤서렬적상관성,근거상관성적대소관계회복수인신식.실험결과표명,산법구유량호적불가견성화로봉성.
A blind watermarking algorithm for color images is proposed in order to extend the range of applying.In procedures of embedding,host image in RGB space is converted to YIQ space.DWT and block-DFT are applied on it.Combining a template matrix and two pseudo random sequences,the binary watermarking image which has been scrambled by implementing Arnold transform is embedded into the host image.In procedures of extracting,embedded sequences in each image blocks are extracted.Correlations between extracted sequence and two pseudo random sequences are calculated respectively.Binary watermarking image is recovered lying on the correlation.Experimental results show the proposed algorithm has good performance in both invisibility and robustness against common image processings.
