Classification of digital camera-models based on demosaicing artifacts

Sevinc Bayram, Husrev T. Sencar, Nasir Memon

    Research output: Contribution to journalArticle

    Abstract

    We utilize traces of demosaicing operation in digital cameras to identify the source camera-model of a digital image. To identify demosaicing artifacts associated with different camera-models, we employ two methods and define a set of image characteristics which are used as features in designing classifiers that distinguish between digital camera-models. The first method tries to estimate demosaicing parameters assuming linear model while the second one extracts periodicity features to detect simple forms of demosaicing. To determine the reliability of the designated image features in differentiating the source camera-model, we consider both images taken under similar settings at fixed sceneries and images taken under independent conditions. In order to show how to use these methods as a forensics tool, we consider several scenarios where we try to (i) determine which camera-model was used to capture a given image among three, four, and five camera-models, (ii) decide whether or not a given image was taken by a particular camera-model among very large number of camera-models (in the order of hundreds), and (iii) more reliably identify the individual camera, that captured a given image, by incorporating demosaicing artifacts with noise characteristics of the imaging sensor of the camera.

    Original languageEnglish (US)
    Pages (from-to)49-59
    Number of pages11
    JournalDigital Investigation
    Volume5
    Issue number1-2
    DOIs
    StatePublished - Sep 2008

    Fingerprint

    Digital cameras
    Artifacts
    artifact
    Cameras
    Periodicity
    Noise
    Linear Models
    linear model
    Classifiers
    scenario
    Imaging techniques
    Sensors

    Keywords

    • Camera
    • Camera-model
    • Color filter array
    • Demosaicing
    • Image forensics
    • Source identification

    ASJC Scopus subject areas

    • Computer Science Applications
    • Law
    • Medical Laboratory Technology

    Cite this

    Classification of digital camera-models based on demosaicing artifacts. / Bayram, Sevinc; Sencar, Husrev T.; Memon, Nasir.

    In: Digital Investigation, Vol. 5, No. 1-2, 09.2008, p. 49-59.

    Research output: Contribution to journalArticle

    Bayram, Sevinc ; Sencar, Husrev T. ; Memon, Nasir. / Classification of digital camera-models based on demosaicing artifacts. In: Digital Investigation. 2008 ; Vol. 5, No. 1-2. pp. 49-59.
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