Novel watermarking method in spatial domain using differential matrix
一种新的多窗口差分矩阵图像水印加载技术研究

This paper proposed a new algorithm to embed watermark into a digital image in spatial domain. Normally, the watermarking in spatial domain suffered from noises, it presented a differential matrix, which generated using several random keys, to construct the result watermarked image. The first step of proposed method was to generate 4 random keys which used to subtract from different regions of original image. Then it added the watermark image into differential matrix using a linear function. The random keys ensured the security of the system and linear combination of differential image and watermark image made the extraction easier than previous methods. Experiments show the proposed method is effectively prevent the noise interferes with, achieving accurate loading and extracting the watermark.