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MEDIAFORENSICS
2010

Improving re-sampling detection by adding noise

9 years 21 days ago
Improving re-sampling detection by adding noise
Current image re-sampling detectors can reliably detect re-sampling in JPEG images only up to a Quality Factor (QF) of 95 or higher. At lower QFs, periodic JPEG blocking artifacts interfere with periodic patterns of re-sampling. We add a controlled amount of noise to the image before the re-sampling detection step. Adding noise suppresses the JPEG artifacts while the periodic patterns due to re-sampling are partially retained. JPEG images of QF range 75-90 are considered. Gaussian/Uniform noise in the range of 28-24 dB is added to the image and the images thus formed are passed to the re-sampling detector. The detector outputs are averaged to get a final output from which re-sampling can be detected even at lower QFs. We consider two re-sampling detectors - one proposed by Poposcu and Farid [1], which works well on uncompressed and mildly compressed JPEG images and the other by Gallagher [2], which is robust on JPEG images but can detect only scaled images. For multiple re-sampling op...
Lakshmanan Nataraj, Anindya Sarkar, B. S. Manjunat
Added 29 Oct 2010
Updated 29 Oct 2010
Type Conference
Year 2010
Where MEDIAFORENSICS
Authors Lakshmanan Nataraj, Anindya Sarkar, B. S. Manjunath
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