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Digital Image Tamper Detection Technique Based on Spectrum Analysis of CFA Artifacts

González Fernández, Edgar, Sandoval Orozco, Ana, García Villalba, Luis, Hernandez-Castro, Julio C. (2018) Digital Image Tamper Detection Technique Based on Spectrum Analysis of CFA Artifacts. Sensors (Basel, Switzerland), 18 (9). ISSN 1424-8220. (doi:10.3390/s18092804)

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https://doi.org/10.3390/s18092804

Abstract

Existence of mobile devices with high performance cameras and powerful image processing applications eases the alteration of digital images for malicious purposes. This work presents a new approach to detect digital image tamper detection technique based on CFA artifacts arising from the differences in the distribution of acquired and interpolated pixels. The experimental evidence supports the capabilities of the proposed method for detecting a broad range of manipulations, e.g., copy-move, resizing, rotation, filtering and colorization. This technique exhibits tampered areas by computing the probability of each pixel of being interpolated and then applying the DCT on small blocks of the probability map. The value of the coefficient for the highest frequency on each block is used to decide whether the analyzed region has been tampered or not. The results shown here were obtained from tests made on a publicly available dataset of tampered images for forensic analysis. Affected zones are clearly highlighted if the method detects CFA inconsistencies. The analysis can be considered successful if the modified zone, or an important part of it, is accurately detected. By analizing a publicly available dataset with images modified with different methods we reach an 86% of accuracy, which provides a good result for a method that does not require previous training.

Item Type: Article
DOI/Identification number: 10.3390/s18092804
Uncontrolled keywords: Bayer Filter; CFA artifacts; Color Filter Array; Discrete Cosine Transform; Image Forensics; image tamper detection
Subjects: Q Science > Q Science (General)
Q Science > QA Mathematics (inc Computing science) > QA 76 Software, computer programming,
Divisions: Faculties > Sciences > School of Computing
Depositing User: Julio Hernandez-Castro
Date Deposited: 02 Oct 2018 12:02 UTC
Last Modified: 29 May 2019 21:13 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/69341 (The current URI for this page, for reference purposes)
González Fernández, Edgar: https://orcid.org/0000-0002-1176-2057
Sandoval Orozco, Ana: https://orcid.org/0000-0002-2846-9017
García Villalba, Luis: https://orcid.org/0000-0001-7573-6272
Hernandez-Castro, Julio C.: https://orcid.org/0000-0002-6432-5328
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