基于线性预测的图像可擦除水印算法

通过研究自然图像的空间相关性和线性预测方法,提出一种在图像中嵌入可擦除水印的新方法。该方法在图像分块的基础上,利用邻近像素之间的相关性在每一图像块中嵌入1位水印,水印信号是用有意义的水印图像,嵌入位置由预测样本的平均值和密钥决定,具有非常好的安全性和易碎性,水印的提取和擦除不需要原始图像。实验表明,该方法嵌入的水印不可见性好,擦除水印的图像与原始图像完全一致,适合于图像的精确认证。

Erasable Watermark Algorithm for Images Based on Linear Prediction

After studying image space correlation and the method of linear prediction,a new erasable watermark algorithm for images is presented.The algorithm splits the original image to some blocks,using correlation of neighboring pixels,a bit watermark is embedded into erery block,the watermark is a binary sequence based on significative watermark image,and using key and average of prediction swatch to determine the position of watermark in the image block,which can assure very good security for the watermark.The watermark is extracted and erased without the original unmarked image.The experiments show that the algorithm can assure good imperceptibility for watermarked image and the watermark is fit for exact authentication of image,this watermark can be successfully erased.