应用科学学报 ›› 2015, Vol. 33 ›› Issue (6): 615-627.doi: 10.3969/j.issn.0255-8297.2015.06.005

• 多媒体信息安全专刊 • 上一篇    下一篇

基于多码本矢量量化的图像篡改恢复

季平, 秦川   

  1. 上海理工大学光电信息与计算机工程学院, 上海 200093
  • 收稿日期:2015-06-30 修回日期:2015-08-06 出版日期:2015-11-30 发布日期:2015-11-30
  • 通信作者: 秦川,博士,副教授,研究方向:数字图像处理、多媒体信息安全,E-mail:qin@usst.edu.cn E-mail:qin@usst.edu.cn
  • 基金资助:

    国家自然科学基金(No.61303203);上海市自然科学基金(No.13ZR1428400);上海市教育委员会科研创新项目基金(No.14YZ087);上海智能家居大规模物联共性技术工程中心项目基金(No.GCZX14014);沪江基金研究基地专项基金(No.C14001);沪江基金(No.C14002)资助

Image Tampering Recovery Based on Multi-codebook Vector Quantization

JI Ping, QIN Chuan   

  1. School of Optical-Electrical and Computer Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
  • Received:2015-06-30 Revised:2015-08-06 Online:2015-11-30 Published:2015-11-30

摘要: 提出一种用于数字图像篡改检测与内容恢复的自嵌入脆弱图像水印算法.对原始图像每个不重叠分块进行基于边缘复杂度的内容分析,选择不同大小的矢量量化码本进行分块压缩,可获得相应的标识符和表示图像分块主要内容的索引值以构成压缩码.将其复制多份后作为参考比特,通过密钥嵌入至其他多个分块中.用于篡改定位的认证比特则被嵌入每个分块本身.由于在多码本矢量量化协同下生成的参考比特具有较高的内容表示效率,该算法在篡改率相同的条件下可取得更理想的内容恢复性能,这一结论得到了实验结果的验证.

关键词: 脆弱水印, 矢量量化, 多码本, 篡改检测, 内容恢复

Abstract: We propose a self-embedding fragile watermarking scheme to detect image tampering and recover original contents. By analyzing edge complexity of all non-overlapping blocks in the original image, the codebooks of vector quantization with different sizes are chosen to compress these blocks. The corresponding indicator and the index value representing the main content of the image block are collected to form the compression codes. They are duplicated to be used as reference-bits. These reference bits are then embedded into other multiple blocks according to secret keys, and authentication-bits are embedded into each block itself. Since the reference-bits based on multiple-codebook vector quantization have high efficiency in representing the image contents, the proposed scheme can achieve good performance of content recovery as compared to the reported methods. This is verified by experimental results.

Key words: fragile watermarking, vector quantization, multi-codebook, tampering detection, content recovery

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