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基于峭度图像的视频指纹算法
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作者 聂秀山 董飞 孙建德 《计算机工程》 CAS CSCD 2013年第2期141-144,共4页
为解决网络视频的非法拷贝问题,提出一种基于峭度图像的视频指纹算法。对视频片段进行预处理后,利用均匀分布的随机变量提取关键帧以及关键帧的峭度图像,并对峭度图像进行离散余弦变换(DCT),采用较大的DCT系数构造视频指纹,在视频指纹... 为解决网络视频的非法拷贝问题,提出一种基于峭度图像的视频指纹算法。对视频片段进行预处理后,利用均匀分布的随机变量提取关键帧以及关键帧的峭度图像,并对峭度图像进行离散余弦变换(DCT),采用较大的DCT系数构造视频指纹,在视频指纹的匹配过程中,通过滑动窗的方法对不同长度的指纹进行匹配,从而达到视频认证的目的。实验结果证明,该算法提取的视频指纹在常见视频攻击下误码率均小于10%。 展开更多
关键词 基于内容的视频指纹 视频哈希 视频拷贝 峭度图像 离散余弦变换 区分性
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Comparison of Coal-Based Dimethyl Ether and Diesel as Vehicle Fuels from Well to Wheel in China
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作者 张亮 黄震 《Journal of Shanghai Jiaotong university(Science)》 EI 2009年第2期210-214,共5页
With life cycle assessment(LCA) methodology,a life cycle model of coal-based vehicle fuels(CBVFs) including coal-based dimethyl ether(CBDME) and coal-based diesel(CBD) is established.Their primary energy consumption(P... With life cycle assessment(LCA) methodology,a life cycle model of coal-based vehicle fuels(CBVFs) including coal-based dimethyl ether(CBDME) and coal-based diesel(CBD) is established.Their primary energy consumption(PEC) and global warming potential(GWP) from well to wheel including feedstock extraction,fuel production,fuel consumption in vehicle and energy transportation are calculated and compared.Results show that the life cycle PEC and GWP of CBD pathway are 1.17 and 1.34 times as CBDME pathway.Based on the above results,CBDME will become a choice with great potential to replace conventional petroleum-based diesel (CPBD) in China. 展开更多
关键词 coal-based vehicle fuel (cbvf) life cycle assessment (LCA) primary energy consumption (PEC) global warming potential (GWP)
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