基于HVS的DCT域数字水印技术

Digital watermarking technology based on HVS in DCT domain

提出了一种结合HVS的DCT域自适应图像水印算法,该算法根据人类视觉系统的频率、亮度、对比度特点,利用JND阈值自适应地调整要嵌入的水印强度,并根据人类视觉频率响应函数表征的人眼对中频信息敏感度较低频信息敏感度低的特点,把水印信息嵌入到经过DCT变换后的原始图像中频区域,完成数字水印的嵌入。

This paper presented a adaptive image watermarking algorithm that considered HVS in DCT domain, the algorithm can adaptively adjust the strength of the embedded watermark making use of the JND threshold that based on the frequency, brightness, contrast the characteristics of the human visual system. And according to the frequency of the human visual frequency response function, the human eye was more sensitive for the lower frequency region than the IF region. So the watermark information was embedded into the IF region of original image that was transform to complete the digital watermark embedding.