基于人眼对比度敏感视觉特性的彩色图像水印技术研究  

Color Image Watermark Technology Based on Contrast Sensitivity of Human Vision System

作　　者：申静[1] 

机构地区：[1]陕西理工学院,汉中723000

出　　处：《包装工程》2014年第3期78-83,106,共7页Packaging Engineering

基　　金：国家自然科学基金项目(10447005);陕西省教育厅专项科研基金项目(2013JK1195)

摘　　要：目的研究结合人眼对比度敏感视觉特性的彩色图像水印技术。方法结合图像变换域频谱特征和人眼对比度敏感视觉特性,提出一种新的人眼感知图像误差阈值的计算方法。依据计算的阈值,设计一种新的基于人眼视觉特性的彩色图像水印嵌入和提取技术方案,并进行仿真实验和多种攻击测试。结果嵌入了水印的彩色图像与原始彩色图像及提取的水印与原始水印相比,几乎一样,人眼无法分辨。经过3种攻击测试后提取的水印信息仍清晰可见,含水印图的PSNR和提取水印的相似度值均较高;在水印方案中,将彩色图像变换到与设备无关的CIELAB颜色空间进行水印的嵌入和提取,有效地提高了水印的实用性。结论文中提出的水印技术具有较好的透明性、鲁棒性和实用性。Objective To study the color image watermark technology based on contrast sensitivity of human vision system. Methods Combined with frequency spectrum feature of the image in transform domain and contrast sensitivity characteristics of human vision system, a new method was brought forward for calculating the error threshold of human perception image. According to the calculated threshold, a new color image watermarking scheme based on human vision system was designed, and simulation experiments and three attack test were carried out. Results There was no difference between the color image with watermark embedded and the original color image, and between the original watermark and extracted watermark, the human eye could not distinguish them. Watermark information extracted after three attacks were still visible. The PSNR value of the image with watermark embedded and the NC values of the extracted watermark were both higher. And in the watermark scheme, the original color image was transformed into the device-independent CIELAB color space, which efficiently further improved the practicality of the watermark. Conclusion The experiment results showed that the proposed watermarking technology had good transparency, robustness and practicality.

关 键 词：数字图像水印 人眼视觉特性 压缩攻击 峰值信噪比 颜色空间 

分 类 号：TS801.3[轻工技术与工程]