【摘要】 工程图直观简洁,图元对象化,内容抽象化.这种特点导致其知识产权不能有效地利用数字水印技术加以保护.提出了一种将二值图标作为水印,以图标的各个像素作为水印信息依次嵌入到AutoCAD图形数据库实体参数中的算法.直线实体经微量修改其构造函数二个端点参数后重新写回到图形数据库.结果表明,这种修改为数据库所接受,该算法具备了透明性和较强的健壮性,并符合数字水印体系的规范,有一定的实用价值.更多还原

【Abstract】 The mechanical drawing consists of metafiles with object c haracteristic,which demands logical deduction to figure out.These cause its in tellectual property right vulnerable to piracy.A scheme of digital watermarking technology is proposed to make a dent in this paper.A black-white image is em bedded into the AutoCAD drawing file by means of slightly modifying line entity ’s construction function parameters,i.e.,the start-point and end-point.The de tection and test show that the algorithm is robust against geometric attacks and oblivious to human vision.更多还原