【摘要】 提出了一种改进的图像高逼真度盲水印算法 ,用相邻特征平均值和奇偶判决法在图像小波域的 3阶子带上内嵌水印的同时 ,利用 2阶子带的频率特性 ,来增加或减少 3阶子带的水印强度 ,在水印检测过程中不需要原始图像。实验结论和攻击测试表明 ,本文所提出的算法从PSNR值的提高和主观视觉效果上都证明了能得到高逼真度的加水印图像 ,并改善了对如JPEG有损压缩、中值滤波、附加噪声等各种图像处理攻击的稳健性。更多还原

【Abstract】 This paper proposes an improved watermarking algorithm for high fidelity of image. While the watermark is embedded in the third level subband of wavelet domain according to neighboring symbol’s mean value and odd-even adjugement rule,the watermark embedding strength of the third level subband can be increased or decreased according to frequency characteristics of the second level subband. This is a blind watermarking which can confirm the copyright without the original image. Experimental results and attack analyses show that the watermark algorithm can produce the watermarked image which has high fidelity and is robust against some image processing operations, such as JPEG lossy compression, filtering and additive noise attacks.更多还原