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基于P帧PU划分模式的H.264至HEVC视频转码重压缩检测算法 被引量:1
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作者 于丽芳 张珍珍 +1 位作者 杨贤 李赵红 《应用科学学报》 CAS CSCD 北大核心 2018年第2期278-286,共9页
提出了一种H.264至HEVC视频转码重压缩检测的新算法.基于HEVC编码标准中的一个新特性—–PU划分模式,利用直方图统计所有GOP的第1个P帧中各PU尺寸占据的8×8块数目,并将此作为视频的分类特征送入SVM进行判别分类.实验结果表明,所提... 提出了一种H.264至HEVC视频转码重压缩检测的新算法.基于HEVC编码标准中的一个新特性—–PU划分模式,利用直方图统计所有GOP的第1个P帧中各PU尺寸占据的8×8块数目,并将此作为视频的分类特征送入SVM进行判别分类.实验结果表明,所提出的算法能有效区分单压视频和转码视频,分类正确率达到90%以上. 展开更多
关键词 视频取证 重压:转码 H.264 HEVC
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A Quantum Secret Sharing Scheme Using Orbital Angular Momentum onto Multiple Spin States Based on Fibonacci Compression Encoding 被引量:1
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作者 Hong Lai Ming-Xing Luo +4 位作者 Yong-Jian Xu Josef Pieprzyk Jun Zhang Lei Pan Mehmet A.Orgun 《Communications in Theoretical Physics》 SCIE CAS CSCD 2018年第10期384-390,共7页
Since the use of a quantum channel is very expensive for transmitting large messages, it is vital to develop an effective quantum compression encoding scheme that is easy to implement. Given that, with the single-phot... Since the use of a quantum channel is very expensive for transmitting large messages, it is vital to develop an effective quantum compression encoding scheme that is easy to implement. Given that, with the single-photon spin-orbit entanglement, we propose a quantum secret sharing scheme using orbital angular momentum onto multiple spin states based on Fibonacci compression encoding. In our proposed scheme, we can represent the frequency of any secret message which is typically collection of bits encodings of text or integers as a bitstring using the base Fibonacci sequence, which is encoded multiple spin states for secret shares transmitted to participants. We demonstrate that Fibonacci compression encoding carries excellent properties that enable us to achieve more robust quantum secret sharing schemes with fewer number of photons. 展开更多
关键词 spin-orbit entanglement multiple spin states Fibonacci compression encoding quantum secretsharing
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