An online system for classifying computer graphics images from natural photographs

Tian-Tsong Ng; Shih-Fu Chang

doi:10.1117/12.650162

16 February 2006 An online system for classifying computer graphics images from natural photographs

Tian-Tsong Ng, Shih-Fu Chang

Proceedings Volume 6072, Security, Steganography, and Watermarking of Multimedia Contents VIII; 607211 (2006) https://doi.org/10.1117/12.650162
Event: Electronic Imaging 2006, 2006, San Jose, California, United States

Abstract

We describe an online system for classifying computer generated images and camera-captured photographic images, as part of our effort in building a complete passive-blind system for image tampering detection (project website at http: //www.ee.columbia.edu/trustfoto). Users are able to submit any image from a local or an online source to the system and get classification results with confidence scores. Our system has implemented three different algorithms from the state of the art based on the geometry, the wavelet, and the cartoon features. We describe the important algorithmic issues involved for achieving satisfactory performances in both speed and accuracy as well as the capability to handle diverse types of input images. We studied the effects of image size reduction on classification accuracy and speed, and found different size reduction methods worked best for different classification methods. In addition, we incorporated machine learning techniques, such as fusion and subclass-based bagging, in order to counter the effect of performance degradation caused by image size reduction. With all these improvements, we are able to speed up the classification speed by more than two times while keeping the classification accuracy almost intact at about 82%.

Citation Download Citation

Tian-Tsong Ng and Shih-Fu Chang "An online system for classifying computer graphics images from natural photographs", Proc. SPIE 6072, Security, Steganography, and Watermarking of Multimedia Contents VIII, 607211 (16 February 2006); https://doi.org/10.1117/12.650162

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