文献类型：期刊文献

英文题名：Geometrically invariant watermarking scheme based on local feature points

作者：Jing, Li[1]; Zhang, Xiaowen[2]

第一作者：景丽

通讯作者：Jing, L.|[1048412295f21ea]景丽;

机构：[1] School of Computer and Information Engineering, Henan University of Economics and Law, Zhengzhou, China; [2] Department of Computer Science, University College Cork, College Road, Cork, Ireland

第一机构：河南财经政法大学计算机与信息工程学院

通讯机构：[1]School of Computer and Information Engineering, Henan University of Economics and Law, Zhengzhou, China|[1048412]河南财经政法大学计算机与信息工程学院;[10484]河南财经政法大学;

年份：2012

卷号：7

期号：3

起止页码：231-238

外文期刊名：Journal of Multimedia

收录：EI(收录号：20123215308878);Scopus(收录号：2-s2.0-84864518540)

语种：英文

外文关键词：Digital watermarking - Image enhancement - Image watermarking - Modulation

摘要：Based on local invariant feature points and cross ratio principle, this paper presents a feature-point-based image watermarking scheme. It is robust to geometric attacks and some signal processes. It extracts local invariant feature points from the image using the improved scale invariant feature transform algorithm. Utilizing these points as vertexes it constructs some quadrilaterals to be as local feature regions. Watermark is inserted these local feature regions repeatedly. In order to get stable local regions it adjusts the number and distribution of extracted feature points. In every chosen local feature region it decides locations to embed watermark bits based on the cross ratio of four collinear points, the cross ratio is invariant to projective transformation. Watermark bits are embedded by quantization modulation, in which the quantization step value is computed with the given PSNR. Experimental results show that the proposed method can strongly fight more geometrical attacks and the compound attacks of geometrical ones. ? 2012 ACADEMY PUBLISHER.