一种模糊自适应图像水印算法的研究

提出了一种基于离散余弦变换（DCT）的模糊自适应水印算法。利用人类视觉系统的照度掩蔽特性和纹理掩蔽特性，结合原始图像的特点，设计了二阶模糊控制器，建立了合理的模糊推理规则，根据图像的灰度值和块均匀度可以决定水印嵌入的强度，使之能够自适应于原始图像。实验结果证明，算法在保证水印化图像质量的前提下，对一些常见的图像处理和噪声干扰具有良好的鲁棒性。算法将二值图像作为水印，将模糊集合理论引入数字水印技术领域，有一定的实用价值和发展前景。

Fuzzy Adaptive Image Watermarking Algorithm

Digital watermarking technology has been proposed as an effective method to protect the copyright of multimedia data. An adaptive watermarking algorithm of image based on fuzzy set theory that in discrete cosine transform (DCT) domain is proposed. By exploiting the visual masking and texture characteristics of human visual system (HVS) and considering the properties of the original image, a two?dimension fuzzy controller is designed, whose inputs are parameters of gray and texture of the original image. The strength of embedded watermarks is decided by the rules of fuzzy controller. It ensures the strength of the watermark adapting to the image itself entirely.The experimental results show that the watermarks generated with the proposed algorithm are invisible and robust against noise such as guassian, salt?pepper noise, and commonly used image processing methods such as JPEG, crop procession?etc.