Spectral Methods to Determine the Exact Scaling Factor of Resample Digital Images

TitleSpectral Methods to Determine the Exact Scaling Factor of Resample Digital Images
Publication TypeConference Paper
Year of Publication2012
AuthorsPfennig, S., & Kirchner M.
Other Numbers3370
Abstract

This paper combines analytical models of periodic interpolationartifacts with recent empirical findings on the spectralenergy distribution of rescaled images to infer exact transformationparameters in a passive-blind forensic setting. Wepresent a measure to solve a long-known ambiguity betweenupscaling and downscaling in the forensic analysis of resampledsignals and thus substantially limit the range of candidatescaling factors. The effectiveness of our method is backed withempirical evidence on a large set of images and scaling factors.

Acknowledgment

This work was partially funded by the Deutscher Akademischer Austausch Dienst (DAAD) through a postdoctoral fellowship.

URLhttp://www.icsi.berkeley.edu/pubs/vision/ICSI_spectralmethods.pdf
Bibliographic Notes

Invited paper, "Image Forensics Techniques" special session, proceedings of the 5th International Symposium on Communications, Control, and Signal Processing (ISCCSP), Rome, Italy

Abbreviated Authors

S. Pfennig and M. Kirchner

ICSI Research Group

Vision

ICSI Publication Type

Article in conference proceedings