Contrast Modification Forensics Algorithm Based on Merged Weight Histogram of Run Length

Contrast Modification Forensics Algorithm Based on Merged Weight Histogram of Run Length

Liang Yang, Tiegang Gao, Yan Xuan, Hang Gao
Copyright: © 2016 |Pages: 9
DOI: 10.4018/IJDCF.2016040103
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Abstract

A novel image forensic algorithm against contrast modification based on merged weight histogram of run length is proposed. In the proposed algorithm, the run length histogram features were firstly extracted, and then those of different orientation were subsequently merged; after normalization of the prior features, the authors calculated leaps in the histogram numerically; lastly, the generated features of authentic and tampered images were trained by a SVM classifier. Large amounts of experiments show that, the proposed algorithm has low cost of computation complexity, compared with some existing scheme, and it has better performance with many test databases, furthermore, the proposed algorithm can effectively detect local contrast modification of image.
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Preliminaries

Contrast Enhancement Detection Based on Histogram

Stamm et al. (2010) have proposed an algorithm of contrast enhancement detection based on histogram peak/gap artifacts left by attacked image; the main steps are described in the following:

  • 1.

    Calculate the image’s pixel value histogram IJDCF.2016040103.m01 and the modified histogram IJDCF.2016040103.m02 such that:

    IJDCF.2016040103.m03
    (1)

where, IJDCF.2016040103.m04 is a pinch off function, whose role is to eliminate the low end or high end saturated effect in image.
  • 2.

    Calculate the high-frequency measurement F according to the following formula:

    IJDCF.2016040103.m05
    ,
    IJDCF.2016040103.m06
    (2)

where, N is the total number of pixels, IJDCF.2016040103.m07is the discrete Fourier frequency transform of IJDCF.2016040103.m08, and IJDCF.2016040103.m09 is the cutoff function deemphasizing the low frequency components of G(k):
IJDCF.2016040103.m10
(3) where, T corresponds to a desired cutoff frequency.

  • 3.

    At last, for a given threshold IJDCF.2016040103.m11, F is compared with the IJDCF.2016040103.m12 to determined whether the image has been modified.

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