Physics-motivated features for distinguishing photographic images and computer graphics

Tian Tsong Ng, Shih Fu Chang, Jessie Hsu, Lexing Xie, Mao Pei Tsui

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

181 Citations (Scopus)

Abstract

The increasing photorealism for computer graphics has made computer graphics a convincing form of image forgery. Therefore, classifying photographic images and photorealistic computer graphics has become an important problem for image forgery detection. In this paper, we propose a new geometry-based image model, motivated by the physical image generation process, to tackle the above-mentioned problem. The proposed model reveals certain physical differences between the two image categories, such as the gamma correction in photographic images and the sharp structures in computer graphics. For the problem of image forgery detection, we propose two levels of image authenticity definition, i.e., imaging-process authenticity and scene authenticity, and analyze our technique against these definitions. Such definition is important for making the concept of image authenticity computable. Apart from offering physical insights, our technique with a classification accuracy of 83.5% outperforms those in the prior work, i.e., wavelet features at 80.3% and cartoon features at 71.0%. We also consider a recapturing attack scenario and propose a counter-attack measure. In addition, we constructed a publicly available benchmark dataset with images of diverse content and computer graphics of high photorealism.

Original languageEnglish
Title of host publicationProceedings of the 13th ACM International Conference on Multimedia, MM 2005
Pages239-248
Number of pages10
DOIs
Publication statusPublished - 2005
Externally publishedYes
Event13th ACM International Conference on Multimedia, MM 2005 - Singapore, Singapore
Duration: 6 Nov 200511 Nov 2005

Publication series

NameProceedings of the 13th ACM International Conference on Multimedia, MM 2005

Conference

Conference13th ACM International Conference on Multimedia, MM 2005
Country/TerritorySingapore
CitySingapore
Period6/11/0511/11/05

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