期刊
FORENSIC SCIENCE INTERNATIONAL
卷 214, 期 1-3, 页码 33-43出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.forsciint.2011.07.015
关键词
Digital forensic; Copy-move forgery; Circle block; Region duplication detection
资金
- National Science Fund of China [60873117]
- Key Program of Natural Science Fund of Tianjin [07JCZDJC06600]
- Key Program of Natural Science Fund of Tianjin, China [11JCZDJC16000]
With the availability of the powerful editing software and sophisticated digital cameras, region duplication is becoming more and more popular in image manipulation where part of an image is pasted to another location to conceal undesirable objects. Most existing techniques to detect such tampering are mainly at the cost of higher computational complexity. In this paper, we present an efficient and robust approach to detect such specific artifact. Firstly, the original image is divided into fixed-size blocks, and discrete cosine transform (DCT) is applied to each block, thus, the DCT coefficients represent each block. Secondly, each cosine transformed block is represented by a circle block and four features are extracted to reduce the dimension of each block. Finally, the feature vectors are lexicographically sorted, and duplicated image blocks will be matched by a preset threshold value. In order to make the algorithm more robust, some parameters are proposed to remove the wrong similar blocks. Experiment results show that our proposed scheme is not only robust to multiple copy-move forgery, but also to blurring or nosing adding and with low computational complexity. (C) 2011 Elsevier Ireland Ltd. All rights reserved.
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