同源视频帧内复制-粘贴篡改检验摘要针对现有方法中篡改检测效率不高、定位不精确的问题，提出了一种结构相似度（SSIM）的同源视频复制-粘贴篡改检测及恢复的方法。首先，将视频转换为灰度图像序列,算法将结构相似度用于度量视频两帧的相似度，并利用结构相似度对搜索策略得到的起始帧进行复检。因为复制视频序列对应两帧的相似度高于未篡改序列对应两帧之间的相似度，本文针对视频帧内的复制一粘贴篡改，基于结构相似度的检测算法，延伸用于图像质量评估的结构相似度来度量视频帧内的相似性，然后把视频帧序列划分为多个重叠的子序列，因为复制帧之间的相似度值会高于正常视频帧内的相似度，所以通过时间域上子序列间的匹配策略可以寻找出存在复制关系的子序列对，最后合并子序列对并剔除误匹配对，从而可以检测出篡改视频并对视频中的复制片段进行精确定位。实验表明该算法对帧内复制一粘贴篡改的视频进行有效检测。关键词:复制粘贴检测；同源视频；视频篡改；结构相似度AbstractAimingattheproblemofinefficienttamperingandinaccuratelocationinexistingmethods,amethodofhomologousvideocopy,pasteandtamperdetectionandrecoveryisproposedbasedonSSIM.First,thevideoisconvertedtoagrayimagesequence.Thealgorithmusesstructuralsimilaritytomeasurethesimilaritybetweentwoframesofvideo,andusesstructuralsimilaritytorechecktheinitialframeobtainedbysearchstrategy.Thesimilarityofcopyofthevideosequencecorrespondingtothetwoframewashigherthanthesequencebetweentwoframescorrespondingtotampering,accordingtothevideoframecopypastetamperingdetectionalgorithmbasedonstructuralsimilarity,structuresimilarityforextensionofimagequalityassessmenttomeasurethesimilarityinthevideoframe,thentheframeisdividedintoapluralityofvideosequencesoverlappingsubsequences,becauseofthesimilarityvaluebetweenduplicateframeswillbehigherthanthenormalsimilaritywithinavideoframe,sothematchingstrategysequenceinthetimedomaincanfindouttheexistingsubsequencesofreplication,andeliminatethefalsematchesonthefinalmergersubsequence,whichcandetecttheaccuratepositioningofthecopiedfragmentsinthevideoandvideotampering.Theexperimentshowsthatthealgorithmcaneffectivelydetectthevideoofacopyandpasteofacopyintheframe.Keywords:copyandpastedetection;homologousvideo;videotampering;structuralsimilarity目录摘要..............................................................................................................................1Abstract........................................................................................................................21、引言........................................................................................................................31.1研究背景与意义..............................................................................................31.2国内外研究现状..............................................................................................41.3研究的主要内容与结构安排..........................................................................62、相关理念概述........................................................................................................62.1视频的复制—粘贴篡改的分类......................................................................61.2复制—粘贴篡改的发展..................................................................................73、基于结构相似度的复制—粘贴篡改检测.............................................................83.1结构相似度理论..............................................................................................
