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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 multimedia digital product copyright protection technology. The characteristic of visible watermark is analyzed. An adaptive visible watermarking scheme based on image brightness and texture features is proposed. With the YUV color model, only the Y-component watermark is embedded for both color or grayscale images. The watermark embedding factor is determined by the local brightness and texture features of the image. Under the precondition of meeting the watermarking characteristics, the watermark embedding strength is increased and the watermarking robustness is improved. The experimental results show that the watermarked image is more robust to attack operations such as median filtering, lossy compression and random noise, and then filtering. The robustness of the watermarked image is more smooth while keeping the histogram of gray histogram unchanged , Indicating that the statistical properties of the watermark and the original image are more consistent. It is very difficult to remove or destroy the visible watermark in the image without damaging the quality of the image.