公开(公告)号：US07065227B2

公开(公告)日：2006-06-20

申请号：US09834365

申请日：2001-04-13

申请人： Masaaki Taniguchi ,  Shuhichi Shimuzu ,  Kohichi Kamijoh

发明人： Masaaki Taniguchi ,  Shuhichi Shimuzu ,  Kohichi Kamijoh

IPC分类号： G06K9/00

CPC分类号： G06T1/0028 ,  G06T2201/0065 ,  G06T2201/0202 ,  H04N1/32144

摘要： Watermark data that indicate additional information, such as copyright information, are optimized in accordance with the contents of object data, and the watermark data is embedded in image data. An image divider 200 divides image data Vi into image blocks Iij, and corresponds a selected basic pattern Phij with each of the image blocks Iij. Orthogonal transformation units 24 and 202 generate DFT coefficients I′ij and P′hij, and power element calculators 208 and 264 generate power elements I″ij and P″ij. A basic pattern adjustment unit 26 adjusts the coefficient of P′hij to generate P′hij1 to P′hijn. A watermark pattern generator 28 calculates variations before and after P′hij1 to P′hijn are embedded in I″ij, and selects, from P′hij1 to P′hijn, P′″hij1 to P′″hij1 that provide variations equal to or smaller than the threshold value e. Then, the watermark pattern generator 28 selects, as a watermark pattern P′ij, the pattern that is most easily detectable, and a pattern embedding unit 204 that adds P′ij to I′ij.

摘要翻译： 指示附加信息（例如版权信息）的水印数据根据对象数据的内容进行优化，水印数据嵌入在图像数据中。 图像分割器200将图像数据Vi分割为图像块Iij，并且将所选择的基本图案Phij与每个图像块Iij对应。 正交变换单元24和202生成DFT系数I'ij和P'hij，功率元件计算器208和264产生功率元件I'ij和P''ij。 基本模式调整单元26调整P'hij的系数以产生P'hij 1至P'hijn。 水印图案生成器28计算P'hij 1至P'hijn之前和之后的变化，并且从P'hij 1至P'hijn中选择P“hij 1至P” hij 1，其提供等于或小于阈值e的变化。 然后，水印图案生成器28选择最容易检测的图案作为水印图案P'ij，以及将P'ij添加到I'ij的图案嵌入单元204。