First Quantization Coefficient Extraction from Double Compressed JPEG Images

  • Fausto Galvan
  • Giovanni Puglisi
  • Arcangelo R. Bruna
  • Sebastiano Battiato
Part of the Lecture Notes in Computer Science book series (LNCS, volume 8156)

Abstract

In the forensics domain can be useful to recover image history, and in particular whether or not it has been doubly compressed. Clarify this point allows to assess if, in addition to the compression at the time of shooting, the picture was decompressed and then resaved. This is not a clear indication of forgery, but it can justify further investigations. In this paper we propose a novel technique able to retrieve the coefficients of the first compression in a double compressed JPEG image when the second compression is lighter than the first one. The proposed approach exploits the effects of successive quantizations followed by dequantization to recover the original compression parameters. Experimental results and comparisons with a state of the art method confirm the effectiveness of the proposed approach.

Keywords

Double JPEG Compression Forgery Identification 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2013

Authors and Affiliations

  • Fausto Galvan
    • 1
  • Giovanni Puglisi
    • 2
  • Arcangelo R. Bruna
    • 2
  • Sebastiano Battiato
    • 2
  1. 1.University of UdineItaly
  2. 2.Dipartimento di Matematica e Informatica - Image Processing LabUniversity of CataniaItaly

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