一种基于块的彩色图像认证水印方法

A Color Image Authentication Watermarking Algorithm Based on Image Block

内容认证是数字水印的主要用途之一 ,结合新颖的样本选取方法提出了一种有效的彩色图像认证水印方法 .水印信号为利用混沌序列生成的二值图像 ,水印的嵌入位置由密钥和 8× 8块中的 48个像素共同决定 ,具有非常好的安全性 ;水印的提取和图像认证不需要原始图像 .实验表明 ,该方法嵌入的水印不可见性好 ,对 JPEG压缩、图像剪切和图像变换等处理具有很好的易碎性 ,适合于图像的区域认证和完整性验证 .

Image authentication is one of the main purpose of watermark. An image authentication watermarking algorithm is presented based on the choice swatch method. The watermark is a binary image based on chaotic sequences, and uses key and 48 pixels in the block to determine the position of watermark in the image, which can assure very well security for the watermark. The watermark is extracted without the origial unmarked image. The experiments show that the algorithm can assure good imperceptibility for watermarked image and the watermark embedded using the algorithm has good fragility against the attacks such as JPEG compression, image shearing and transforming, and beseem to authenticate region and integrality for image.