Method and apparatus for identifying an imaging device
DCFirst Claim
1. A non-intrusive method for determining whether digital images are derived from the same electronic imager, comprising the steps of analyzing at least two-electronic images to determine whether an intrinsic imager noise pattern represented therein is consistent with an intrinsic imager noise pattern attributable to a common imager for the at least two digital images, and outputting an indicia of that determined consistency.
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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.
23 Citations
23 Claims
- 1. A non-intrusive method for determining whether digital images are derived from the same electronic imager, comprising the steps of analyzing at least two-electronic images to determine whether an intrinsic imager noise pattern represented therein is consistent with an intrinsic imager noise pattern attributable to a common imager for the at least two digital images, and outputting an indicia of that determined consistency.
- 11. Apparatus for determining whether a plurality of different digital images are derived from the same electronic imager, comprising an input for receiving the plurality of different digital images to be analyzed, a processor for analyzing the plurality of different digital images to determine whether an intrinsic imager noise pattern represented therein is consistent with an intrinsic imager noise pattern attributable to a common imager, and an output for presenting an indication of that determined consistency.
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23. A method for determining whether a plurality of different digital images are derived from the same electronic imager, comprising analyzing a plurality of different digital images to determine whether an intrinsic imager noise pattern comprising imager noise under varying states of illumination represented therein is consistent with an intrinsic imager noise pattern attributable to the same electronic imager, and outputting an indicia of that determined consistency.
Specification