【作者】 姜东升； 许文才；

【Author】 Dongsheng Jiang,Wencai Xu Beijing Institute of Graphic Communication,Beijing,102600,China

【机构】 北京印刷学院印刷与包装工程学院；

【摘要】 为了将数字水印嵌入印刷图像当中并能准确的读取出来,对数字水印的嵌入和提取算法进行了设计。分别对水印算法和JPEG图像嵌入数字水印设计。嵌入和提取程序是对JPEG图像量化后的DCT(离散余弦变换)系数进行。采用数码打印的方式生成原图片印刷品和含有水印的图片印刷品,通过将数字图像转换为印刷品并利用人眼视觉的真实感觉来判断数字水印算法不可见性的鲁棒性。更多还原

【Abstract】 For inserting a digital watermark into digital image and reading it out exactly,design the watermarking and extracting algorithm.One of which is designed for the algorithm of digital watermark and the other is for digital watermarks inserting into JPEG image.The programs of inserting and extracting digital watermark aim at the DCT(Discrete Cosine Transform) modulus after quantization.In the program the places of inserting digital watermarks are decided by the input password,the way of inserting digital watermarks is decided by the algorithm.Print the original image and the image with digital watermarks into presswork by digital printing.Judge the robustness of invisible quality of the digital watermark algorithm by the true sense of human vision from the presswork.更多还原