【摘要】 设计并实现了一个基于参数导引随机共振的DCT域数字图像水印算法。在嵌入方,将伪随机的水印序列上采样后与DCT交流系数相加得到嵌入水印的系数,在检测方,待检测图像的DCT交流系数当作随机共振信号处理器的惟一输入,通过调节随机共振信号处理器的参数实现水印的检测。仿真结果表明,算法在保证水印不可感知的前提下能抵抗包括加噪声污染、直方图均衡等信号处理攻击。更多还原

【Abstract】 An algorithm of digital image watermarking was designed based on the stochastic resonance,where the watermark was looked as the weak signal and the DCT ac coefficients of the image were looked as the noise.The watermark,the DCT ac coefficients and the bi-stable system made up of a stochastic resonance signal processor to detect the watermark.Numerical simulations results show that the algorithm can resist against several attacks,such as JPEG compression,adding Gauss noise,histogram equalization and so on,keeping the watermark imperceptible.更多还原