CAJ | 학술논문

为使数字水印在信息安全和版权保护中起到更好的作用，本文提出一种基于小波变换的数字水印算法。该算法将载体图像经小波分解后，选择第三级细节子图块中能量最大的块嵌入的水印，从而保证嵌入的水印具有良好的不可见性、鲁棒性和透明性。最后，运用Matlab7.0软件进行实验仿真，结果表明应用本算法实现的水印图像具有很好的不可见性，并对图像进行各种退化处理后，通过比较其NC相似值，说明嵌入水印后的图像具有良好的鲁棒性和透明性。
위사수자수인재신식안전화판권보호중기도경호적작용，본문제출일충기우소파변환적수자수인산법。해산법장재체도상경소파분해후，선택제삼급세절자도괴중능량최대적괴감입적수인，종이보증감입적수인구유량호적불가견성、로봉성화투명성。최후，운용Matlab7.0연건진행실험방진，결과표명응용본산법실현적수인도상구유흔호적불가견성，병대도상진행각충퇴화처리후，통과비교기NC상사치，설명감입수인후적도상구유량호적로봉성화투명성。
An improved digital watermarking algorithm based on wavelet transform was proposed on basis of meeting requirement of protecting information copyright. The third level detail sub-images decomposed from the original image using three levels Discrete Wavelet Transform( DWT) are divided into non-overlap blocks. The meaningful watermarking information is embedded into the larger energy blocks to get robust and imperceptible watermark. Final y, using Matlab7.0 software to simulate experiment, the results show that the algorithm is applied to imply the watermark image has good invisibility, and through a variety of degradation processing, show that after embedding watermark image has good robustness and imperceptible by comparing the NC similar values.