学术报告信息 DMIC沙龙2012-6-30

报告人： 胡东辉

报告题目：On Digital Image Trustworthiness

时间：周六（2012年6月30日），下午15:00

地点：斛兵楼416

摘要：Digital images are facing a crisis of trustworthiness with the emerging of various digital image processing and steganography tools. This paper proposes a new method that can evaluate the trustworthiness of digital images. In our proposal, an information fusion method is used to combine current digital image forensic models at feature level and decision level. We find that uncertainties exist when using current forensic models to detect multi-manipulations, and evidences supported by different forensic models may conflict with each other. We use Dempster-Shafer (D-S) evidence theory to allow for the uncertainties of forensic models and reduce the conflicts among evidences. The lower limit and upper limit of digital image trustworthiness can be reliably evaluated by D-S theory. Three models based on D-S theory and information fusion are proposed. The first model uses D-S theory at feature fusion level. The second model uses D-S theory at decision fusion level, and moreover, an improved least square method is designed to reduce the conflicts of the evidences. The last model is a combination of the first and second models, where D-S theory is applied to both feature fusion and decision fusion levels. Experimental results show that the three models can evaluate digital image trustworthiness effectively, among which,the last one is the most effective.

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