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 -