一种邻域像素差预测的可逆水印算法

针对现有高容量水印嵌入算法中载体图像失真问题,提出一种邻域差值预测的可逆水印算法,该算法通过计算相邻像素差值的绝对值来决定是否嵌入水印.为确保较高的图像质量,设置理想阈值,嵌入过程中如果绝对差值高于预设的阈值,则像素保持不变.结果表明,与同类算法相比,该算法具有较好的图像质量和高嵌入容量.

A Reversible Watermarking Algorithm of Neighboring Pixel Difference Predict

To solve the image distortion of its carrier that occurs in high capacity reversible watermarking,a reversible watermarking algorithm was proposed to determine whether the pixel is embeddable or not by calculating the absolute difference of its neighboring pixels. In order that the image might be in a higher quality,and that the threshold should be an ideal one,the pixel should be unchanged in insetting if the absolute difference is higher than the threshold expected. Experimental results and performance comparisons showed that the proposed method has much better visual quality and higher capacity than the methods recently proposed.