TY - CONF
T1 - An SVD Approach to Forensic Image Resampling Detection
T2 - EUSIPCO
Y1 - 2015
A1 - David Vázquez-Padín
A1 - Pedro Comesaña
A1 - Fernando Pérez-González
KW - compass
KW - digital image forensics
KW - resampling detection
KW - SVD
KW - tampering detection
AB -
This paper describes a new strategy for image resampling detection whenever the applied resampling factor is larger than one. Delving into the linear dependencies induced in an image after the application of an upsampling operation, we show that interpolated images belong to a subspace defined by the interpolation kernel. Within this framework, by computing the SVD of a given image block and a measure of its degree of saturated pixels per row/column, we derive a simple detector capable of discriminating between upsampled images and genuine images. Furthermore, the proposed detector shows remarkable results with blocks of small size and outperforms state-of-the-art methods.
JF - EUSIPCO
ER -