【作者】 李莉； 宗福建；

【Author】 Li Li, Zong Fu-Jian(Shandong Electric Power Research Institute, Jinan 250002; Physics And Microelectronics, Shandong University, Jinan 250100;

【机构】 山东电力研究院信息中心； 山东大学物理与微电子学院；

【摘要】 提出一种具有抗剪裁能力的针对24位bmp格式图像文件的基于LSB方法的数字水印算法,该方法具有较高的鲁棒性。由于剪裁操作可能发生在图片的任意位置,因此水印信息的定位成为该方法的关键技术。该方法的创新点为:采用自同步字节实现水印提取的自动同步,采用前标识标志水印信息的起始位置,采用后标识标志水印信息的结束并验证水印信息的完整性。采用该方法隐藏的数字水印,只要剪裁部分的宽度大于50个象素,就有可能检测到数字水印标识,剪裁图形的宽度大于70个象素时基本上都能检测到数字水印标识,剪裁图形的宽度大于100个象素时保证都能检测到数字水印标识。更多还原

【Abstract】 A method based on LSB algorithm is discussed that has high robustness to cutting operations occurring in 24 bits bitmap picture. Because cutting operations may occur at any place in the picture, the key technique is to locate the watermark. The new point of this method is using automatic synchronization byte to implement automatic synchronization in watermark extraction. Use beginning-flags to present the begin place of the watermark, and ending-flags to present the end place and to validate the integrity of the watermark information. Using this method, as the cutting picture’s wide is larger than 50 pixels, the watermark information may be extracted. The wider the cutting picture, the better the extraction. As the cutting picture’s wide is larger than 100 pixels, the watermark information must be extracted.更多还原