Method and apparatus for identifying an imaging device
AssigneeThe Research Foundation of State University of New York
InventorsJessica Fridrich, Miroslay Goljan, Jan Lukas
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Abstract
A new technique for identifying whether images are derived from a common imager, e.g., a camera, or other imaging device such as a scanner, based on the device's measured or inferred reference noise pattern, a unique stochastic characteristic of all common digital imaging sensors, including CCD, CMOS (Foveon™ X3), and JFET. The measured or inferred noise pattern of two images may be extracted and then cross correlated, with a high correlation being consistent with a common imager. Various preprocessing techniques may be used to improve tolerance to various types of image transform. It is also possible to perform the analysis without explicit separation of inferred image and inferred noise.
Claims20
A method for determining whether digital images are derived from the same electronic imager, comprising the steps of analyzing the images to determine whether an inferred noise pattern represented therein is consistent with a noise pattern attributable to a common imager, and outputting an indicia of that determined consistency.
Apparatus for determining whether digital images are derived from the same electronic imager, comprising an input for receiving the digital images to be analyzed, a processor for analyzing the digital images to determine whether an inferred noise pattern represented therein is consistent with a noise pattern attributable to a common imager, and an output for presenting an indication of that determined consistency.
Dependencies are inferred from the claim text.