Detecting doctored JPEG images

Details Detecting doctored JPEG images Detecting doctored JPEG images

2006-02-17

2008-10-21

Nguyen, Phu K (Department: 2628)

Computer graphics processing and selective visual display system

Computer graphics processing

Graphic manipulation

C345S619000, C382S112000, C382S170000

Reexamination Certificate

active

07439989

ABSTRACT:
Systems and methods for detecting doctored JPEG images are described. In one aspect, a JPEG image is evaluated to determine if the JPEG image comprises double quantization effects of double quantized Discrete Cosine Transform coefficients. In response to results of these evaluation operations, the systems and methods determine whether the JPEG image has been doctored and identify any doctored portion.

REFERENCES:
patent: 7227998 (2007-06-01), Nakayama et al.
Popescu et al., Statistical Tools for Digital Forensics, Department of Computer Science at Dartmouth College, Lecture Note for Computer Science, pp. 128-147, 2004.
Popescu et al., Exposing Digital Forgeries by Detecting Traces of Resampling, IEEE transaction on Signal Processing, Feb. 2005, pp. 758-767.
Wang et al., Exposing Digital Forgeries in Video by Detecting Double MPEG Compression, MM&Sec'06, Sep. 2006, pp. 37-47.
Popescu et al., Exposing Digital Forgeries by Detecting Duplicated Image Regions, Computer Science, Dartmouth College, Lecture notes, 2006, pp. 1-11.

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