CAJ | 학술논문

为对MPEG视频是否经受恶意篡改实施有效认证,提出一种融合全局内容特征和局部内容特征的MPEG视频分层CFA认证方案.该方案选取的特征具有两类"半脆弱"的特征,即全局特征和局部特征.全局特征由I帧分块DC系数矩阵的相关系数构建,而局部特征则反映了视频宏块的基本信息.基于两类特征的构建,使得方案对于可接受的"内容保持"处理具有鲁棒性,而对恶意篡改具有敏感性,从而增强了对内容篡改行为的识别能力.同时,方案能够以较小的计算复杂度对视频内容是否遭受恶意篡改进行快速判决,平均运算时间减少了约20%.
위대MPEG시빈시부경수악의찬개실시유효인증,제출일충융합전국내용특정화국부내용특정적MPEG시빈분층CFA인증방안.해방안선취적특정구유량류"반취약"적특정,즉전국특정화국부특정.전국특정유I정분괴DC계수구진적상관계수구건,이국부특정칙반영료시빈굉괴적기본신식.기우량류특정적구건,사득방안대우가접수적"내용보지"처리구유로봉성,이대악의찬개구유민감성,종이증강료대내용찬개행위적식별능력.동시,방안능구이교소적계산복잡도대시빈내용시부조수악의찬개진행쾌속판결,평균운산시간감소료약20%.
An MPEG video hierarchical content watermarking authentication scheme that utilized the local and global features among video frames was proposed to find out whether the content of video had been maliciously changed or not. The two employed kinds of features in the scheme,the global one and the local one,are semi-fragile,which can tolerate the legal content persistent operation and sensitive to the tamper operations. The global feature was abstracted from the relation coefficients of DC coefficient matrix in the I type pictures,which could detect the content tamper with a lower computation payload. After the tamper frame was decided,the tamper positions could be further localized with the local features. Experimental results show the satisfying performance of the proposed scheme. The fit choosing strategy in this scheme can reduce the computing payload about 20 percent. In a word,the content feature based video authentication scheme can lighten the way to build practical video authentication methods.