%0 Journal Article
%T Analysis and Improvement of Formulas for Evaluating Similarity Degree of Digital Watermarks<br>评价数字水印相似程度的公式分析及改进
%A LI Xu-Dong
%A <br>李旭东
%J 自动化学报
%D 2008
%I 
%X Currently familiar formulas called normalized cor- relation,which are used for evaluating the similarity degree of digital watermarks,showed their big shortage when expressing the similarity degree of extracted watermark and original wa- termark in inverse similarity.Therefore,in this paper,several common formulas of normalized correlation are analyzed firstly. Then by inheriting the rationality and effectivity of these formu- las,and overcoming the shortage of them,a novel formula named polarized correlation is constructed,which can more scientifi- cally,rationally,and effectively evaluate the similarity degree of digital watermarks.Lastly,contrasting experiments of polarized correlation and normalized correlation are done,and the experi- mental results validate the science,rationality,and effectivity of polarized correlation.
%K Digital watermarking
%K similarity degree
%K polarized correlation
%K normalized correlation<br>数字水印
%K 相似度
%K 两极化相关值
%K 归一化相关值
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=8240383F08CE46C8B05036380D75B607&jid=E76622685B64B2AA896A7F777B64EB3A&aid=04ACEE10437147345CE82A40C709E1C2&yid=67289AFF6305E306&vid=339D79302DF62549&iid=0B39A22176CE99FB&sid=3D9746C06EC12B45&eid=AA27B676BFCAA4BE&journal_id=0254-4156&journal_name=自动化学报&referenced_num=1&reference_num=12