基于亮度和纹理特征的可见水印技术

Visible watermarking technique based on luminance and texture features

数字水印是一种多媒体数字产品版权保护技术。分析了可见水印应具有的特性,提出了基于图像亮度和纹理特征的自适应可见水印方案。采用YUV颜色模型,只对Y分量水印嵌入,以同时适用于彩色或灰度图像。水印嵌入因子是由图像的局部亮度和纹理特征确定,可在满足水印特性的前提下,增加水印嵌入强度,提高水印鲁棒性。试验表明:嵌入水印的图像对中值滤波、有损压缩、加入随机噪声后再滤波等攻击性操作具有较强的鲁棒性,在保持灰度直方图分布基本不变的基础上更加平滑集中,说明水印和原图的统计特性较一致,想在不损坏图像使用质量的前提下,去除或毁坏图像中的可见水印是很困难的。

Digital watermarking is a technique for protection of ownership rights on multimedia product. By analyzing the characteristics of visible watermarking, an adaptive visible watermarking scheme based on the luminance and texture features is proposed. In order to adapt the scheme to both the color image and the gray image, the YUV color model is employed. While embedding the watermarking into the image, the scaling factors are determined by the local luminance feature and texture features of the image. It can improve the embedding strength and the watermarking robustness. From the experimental results, the stego\|images are extremely robust to common image processing such as median filter, JPEG compression and denoising after adding the stochastic noises. Meanwhile, the distributions of those gray\|value histograms of stego\|images are more concentrated than those of cover\|images. It seems that removing the visible watermarking without damaging the cover\|image is very difficult and time consuming.