| 高铁杠,杨富圣,盛国瑞.一种新的基于DCT域系数对直方图的图像篡改取证方法[J].光电子激光,2014,(11):2196~2202 |
| 一种新的基于DCT域系数对直方图的图像篡改取证方法 |
| A novel image forensic method based on coefficient-pair histogram in DCT domain |
| 投稿时间：2014-06-29 |
| DOI： |
| 中文关键词: 图像取证 像素对直方图 系数对直方图 支持向量机(SVM) |
| 英文关键词:image forensics pixel-pair histogram coefficient-pair histogram support vec tor machine (SVM) |
| 基金项目:天津市自然科学基金重点(11JCZDJC16000)资助项目 (南开大学 软件学院,天津 300071) |
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| 中文摘要: |
| 提出了一种基于离散系数变换(DCT)域系数对直方 图特征的图像篡改取证方法。首先对图像进行 DCT,并在给定的阈值下,对变换后的DCT系数进行系数对直方图化；而后对直方图化后 的值进行归一化处理,再用主成分分析(PCA)对上述数据进行降维处理取得系数对直方图特 征；最后将真 实图像和篡改后图像的系数对特征用支持向量机(SVM)进行分类识别。实验结果证明,和现 有的一些算 法相比,提出的方法计算复杂度低,在CASIA v1.0平均识别率为97.92%,CASIA v2.0平均 识别率为91.20%,对未压缩图像和压缩图像的拼接篡改都具有良好的 识别性能。 |
| 英文摘要: |
| Digital images can be forged easily with today’s widely available ima ge processing software. One of the most common practices in image tampering involves cropping a patch fr om a source and pasting it onto a target.This task,when images are used as evidence to influen ce or decide judgment such as in a court of law,can be crucial.A novel image forensic method based o n coefficient-pair histogram in discrete cosine transform (DCT) domain is proposed.In the method, firstly,the image is transformed by DCT,then with the given threshold,coefficient-pa ir histogram is computed for the DCT coefficients,and normalization processing is excuted on the coefficient-pa ir histogram.After that, principal component analysis (PCA) is used to reduce the dimension of the above data to get the final image features.Lastly,support vector machine (SVM) is exploited to classify th e authentic and spliced images through training the feature vectors of them. In CASIA v1.0,the recognition rate reach 97.92%,and it is 91.20% in CASIA v2.0.The experim ental results show that compared with some existing methods, the proposed approach has low com puting complexity and good recognition performance in both uncompressed and comp ressed images. |
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