CAJ | 학술논문

　　为了提高常规小波域水印算法的自适应性，在此提出了一种在小波域嵌入数字水印的新算法。首先，对载体图像进行一层小波分解；然后，对具有较大纹理强度的中频子带进行二层小波分解，并选取二层中频子带HL1作为嵌入区域；最后，计算嵌入区域中每一点的亮度差异值，并根据HVS原理将混沌置乱后的二值水印信息自适应的嵌入到具有较大亮度差异的位置上。经仿真实验表明，该算法具有很好的不可见性，且对JPEG压缩、加噪、滤波等常见的图像攻击具有很强的鲁棒性。
　　위료제고상규소파역수인산법적자괄응성，재차제출료일충재소파역감입수자수인적신산법。수선，대재체도상진행일층소파분해；연후，대구유교대문리강도적중빈자대진행이층소파분해，병선취이층중빈자대HL1작위감입구역；최후，계산감입구역중매일점적량도차이치，병근거HVS원리장혼돈치란후적이치수인신식자괄응적감입도구유교대량도차이적위치상。경방진실험표명，해산법구유흔호적불가견성，차대JPEG압축、가조、려파등상견적도상공격구유흔강적로봉성。
In order to improve the self?adaptability of normal digital watermarking algorithm in discrete wavelet transform (DWT)domain,a novel algorithm of embedding digital watermark into wavelet transform domain is proposed in this paper. The first?level wavelet decomposition for a carrier image is executed first,and then the second?level wavelet decomposition for the middle frequency sub?band with high texture strength and the second?level middle frequency sub?band HL1 is selected as an em?bedding area. Finally,brightness difference of each point in the embedding area is calculated,and according to HVS principle, the binary watermark information with logistic chaos scramble is self?adaptively embedded into the location with high brightness difference. Simulation results prove this algorithm has a good invisibility and robustness against attacks such as JPEG compres?sion,adding noise,filtering and other image manipulations.