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一种基于GOP的视频水印算法
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作者 鲁晓辉 《商丘师范学院学报》 CAS 2015年第6期58-62,共5页
利用MPEG-2协议中画面组(GOP)的结构特点,利用修改每个GOP中B帧亮度最高分块的亮度增加或减少趋势实现水印信息的嵌入.在嵌入强度的设置中,充分考虑人类视觉特性.实验结果表明该算法能够抵抗各种常规攻击,具有良好的安全性、鲁棒性和不... 利用MPEG-2协议中画面组(GOP)的结构特点,利用修改每个GOP中B帧亮度最高分块的亮度增加或减少趋势实现水印信息的嵌入.在嵌入强度的设置中,充分考虑人类视觉特性.实验结果表明该算法能够抵抗各种常规攻击,具有良好的安全性、鲁棒性和不可见性. 展开更多
关键词 人类视觉系统 画面组 鲁棒性 数字水印
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Genetic polymorphism of mitochondrial DNA HVS-I and HVS-II of Chinese Tu ethnic minority group 被引量:2
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作者 Feng Chen Yajun Deng +6 位作者 Yonghui Dang Bo Zhang Haofang Mu Xiaoguang Yu Lin Li Chunxia Yan Teng Chen 《Journal of Genetics and Genomics》 SCIE CAS CSCD 北大核心 2008年第4期225-232,共8页
We analyzed the two hypervariable segments HVS-I and HVS-II of 108 Chinese Tu ethnic minority group samples for forensic and population genetics purposes, Comparing with Anderson sequence, 79 polymorphic loci in HVS-I... We analyzed the two hypervariable segments HVS-I and HVS-II of 108 Chinese Tu ethnic minority group samples for forensic and population genetics purposes, Comparing with Anderson sequence, 79 polymorphic loci in HVS-I and 40 in HVS-II were found in Chinese Tu ethnic minority group mtDNA sequences, and 90 and 64 haplotypes were then defined. Haplotype diversity and the mean pairwise differences were 0.9903±0.0013 and 5.7785 in HVS-I, and 0.9777±0.0013 and 3.5819 in HVS-II, respectively. By analyzing the hypervariable domain from nucleotide 1,6180 to 1,6193 in HVS-I, we defined some new types of sequence variations. We also compared the relationship between Tu population and other populations using mtDNA HVS-I sequences. According to Rst genetic distances, the phylogenetic tree showed that the Tu population, the Xi'an Han population, the Chinese Korean, and the Mongol ethnic group were in a clade. This indicated a close genetic relationship between them. There were far relations between the Tu population and other Chinese southern Han populations, Siberian, European, African, and other foreign populations. The results suggest that Tu population has a multi-origin and has also merged with other local populations. 展开更多
关键词 mtDNA HVS-I HVS-II Chinese Tu ethnic minority group population genetics
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区间值直觉模糊超子群 被引量:6
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作者 詹建明 《Journal of Mathematical Research and Exposition》 CSCD 北大核心 2007年第4期755-761,共7页
在K.Atanassov引进区间值直觉模糊集的基础上,给出了区间值直觉模糊超子群的定义,刻画了其特征结构,研究了这类区间值直觉模糊超群的同态像及原像等问题.同时,讨论了区间值直觉模糊超子群与区间值直觉模糊子群的关系.
关键词 超群 区间值直觉模糊超子群 同态 区间值直觉模糊子群
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