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Journal of Electronic Imaging

Color filter array pattern identification using variance of color difference image
Author(s): Hyun Jun Shin; Jong Ju Jeon; Il Kyu Eom
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Paper Abstract

A color filter array is placed on the image sensor of a digital camera to acquire color images. Each pixel uses only one color, since the image sensor can measure only one color per pixel. Therefore, empty pixels are filled using an interpolation process called demosaicing. The original and the interpolated pixels have different statistical characteristics. If the image is modified by manipulation or forgery, the color filter array pattern is altered. This pattern change can be a clue for image forgery detection. However, most forgery detection algorithms have the disadvantage of assuming the color filter array pattern. We present an identification method of the color filter array pattern. Initially, the local mean is eliminated to remove the background effect. Subsequently, the color difference block is constructed to emphasize the difference between the original pixel and the interpolated pixel. The variance measure of the color difference image is proposed as a means of estimating the color filter array configuration. The experimental results show that the proposed method is effective in identifying the color filter array pattern. Compared with conventional methods, our method provides superior performance.

Paper Details

Date Published: 7 August 2017
PDF: 12 pages
J. Electron. Imag. 26(4) 043015 doi: 10.1117/1.JEI.26.4.043015
Published in: Journal of Electronic Imaging Volume 26, Issue 4
Show Author Affiliations
Hyun Jun Shin, Pusan National Univ. (Republic of Korea)
Jong Ju Jeon, Pusan National Univ. (Republic of Korea)
Il Kyu Eom, Pusan National Univ. (Republic of Korea)

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