自适应盲水印图像小波变换算法及实现

Adaptive Blind Watermarking Image Algorithm Based DWT and Its Realization

关键词:  盲水印  自适应量化  鲁棒性  离散小波变换

Key words:  blind watermarking  self adaptive quantization  robustness  discrete wavelet transform

摘要:

针对传统基于人类视觉系统特性的空间域与变换域结合算法中嵌入信息量小和检测准确率低的缺点,利用图像的局部纹理特性生成扩频码,并在水印嵌入过程中引入加密方法,通过计算相邻特征平均值为自适应调整待量化小波系数的量化间隔,提出并实现一种基于小波变换的数字图像自适应盲水印新算法,并用新算法进行仿真实验。仿真实验结果表明新算法通过阈值检测准确率高,对常见的图像处理有较好的鲁棒性,并且简便易行,计算量小。新算法在应用中有较大的灵活性,可嵌入信息容量大,运算速度快,可操作性强。

Abstract:

A novel self adaptive digital image blind watermarking algorithm,aimed at the disadvantages of traditional method which combine spatial and DWT domain based on the characteristics of human visual system is put forward and realized.Patulous code is built by using local veins characteristic of image and encrypting means is introduced in the course of embedding watermark and it can adaptively adjust the quantized interval by calculating the border upon characters' mean value of the wavelet coefficients which is selected to embed watermark.Result of emulator experiment indicates that veracity of threshold value is higher than that of traditional method and is of better robustness.The new algorithm shows the following traits:easier actuality,less and faster calculation,better flexibility,great capacity of embedding information,and stronger operation capability.