计算机工程

• 安全技术 • 上一篇    下一篇

基于LCD模型的LCU选择性视频加密

徐博文,王晓东,章联军,郭磊,王健   

  1. (宁波大学 信息科学与工程学院,浙江 宁波 315211)
  • 收稿日期:2016-10-17 出版日期:2017-11-15 发布日期:2017-11-15
  • 作者简介:徐博文(1993—),男,硕士,主研方向为多媒体信息安全、视频图像处理;王晓东,副教授;章联军,研究员;郭磊、王健,硕士。
  • 基金项目:
    国家自然科学基金(U1301257);国家科技支撑计划项目(2012BAH67F01);浙江省教育厅科研计划项目(Y201327703);浙江省科技厅创新团队自主设计项目(2012R10009-08);浙江省自然科学基金(Y1110161);宁波市科技创新团队研究计划项目(2011B81002)。

LCU Selective Video Encryption Based on LCD Model

XU Bowen,WANG Xiaodong,ZHANG Lianjun,GUO Lei,WANG Jian   

  1. (School of Information Science and Engineering,Ningbo University,Ningbo,Zhejiang 315211,China)
  • Received:2016-10-17 Online:2017-11-15 Published:2017-11-15

摘要: 为满足视频加密中部分信息加密的需求,提出一种基于最大编码单元(LCU)的选择性视频加密方案。结合高效视频编码标准得到四叉树分割下的编码单元差值图,设计LCU灰度相关度与中心距离加权融合的LCU相关距离模型,统计差值图的LCU相关性,使LCU具备可选择性加密能力,并将Arnold置乱算法应用于方块化的LCU,通过多LCU块的加密增加破解难度。实验结果表明,与现有视频加密方案相比,该方案对于视频关键区域的加密具有更高的安全性。

关键词: 高效视频编码, 视频加密, 最大编码单元, LCU相关距离, Arnold加密

Abstract: Aiming at realizing the demand for local refinement in video encryption,a scheme of selective video encryption based on Largest Coding Unit(LCU) is proposed.Combined with High Efficiency Video Coding(HEVC),it obtains the difference charts of CU on quad-tree partition.It designs a LCU Correlation Distance(LCD) model based on the center distance weight and gray correlation of LCU to count the LCU correlation of all the difference charts,so that all LCUs have selective encryption capability.Arnold scrambling algorithhm for the LCU block can be directly carried out and encrypting multi LCU blocks makes the decryption greatly difficult.Experimental results show that this scheme has a really safe encrypting capability for the video key areas compared with existing videl encryption schemes.

Key words: High Efficiency Video Coding(HEVC), video encryption, Largest Coding Unit(LCU), LCU Correlation Distance(LCD), Arnold encryption

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