Abstract
In this work, we propose several new methods for detecting photographic composites using circles. In particular, we focus on three kinds of scenes: (1) two coplanar circles with the same radius; (2) a single circle with its discriminable center; (3) a single circle with geometric constraints for camera calibration. For two circles’ situation, we first estimate the focal length based on the equality of the sizes of two coplanar circles, and then estimate the normal vector of the world circle plane. Inconsistencies in the angles among the normal vectors (Each circle determines a normal vector) are used as evidence of tampering. On the other hand, for the single circle case, we warp the circle to make metric measurement. To demonstrate the effectiveness of the approach, we present results for synthetic and visually plausible composite images.
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Shuyi Zhu received the BE from the College of Mathematics and Computer Science, Hebei University, China, in 2008. She worked as a research assistant in Computer Vision Laboratory from April 2009 to January 2012. Her research interests lie in the computer vision field, covering multimedia forensics, multiple view geometry, and 3D reconstruction.
Xiaochun Cao received the BE and ME both in Computer Science from Beihang University, China. He received the PhD in Computer Science from the University of Central Florida, Orlando, USA, with his dissertation nominated for the university-level award for outstanding dissertation.
After graduation, he spent about three years at ObjectVideo Inc. as a research scientist. Since August 2008, he has been with Tianjin University, China, where he is currently a professor of computer science. He has authored and coauthored over 50 peer-reviewed journal and conference papers, and has been in the organizing and the technical committees of several international colloquia.
In 2004 and 2010, Dr. Cao was the recipients of the Piero Zamperoni best student paper award at the International Conference on Pattern Recognition.
Handong Zhao received the BE from the School of Computer Science and Technology, Tianjin University, China, in 2010.
He is currently a second-year graduate student with the School of Computer Science and Technology, Tianjin University, China. He has been working as a research assistant in Computer Vision Laboratory since 2010. His research interests lie in the computer vision field, covering multimedia forensics, object segmentation, and image processing.
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Zhu, S., Cao, X. & Zhao, H. Photographic composite detection using circles. Front. Comput. Sci. 6, 741–755 (2012). https://doi.org/10.1007/s11704-012-1248-2
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DOI: https://doi.org/10.1007/s11704-012-1248-2