The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 19, 2019
Filed:
Sep. 29, 2016
The United States of America As Represented BY the Director, National Security Agency, Washington, DC (US);
Sarah T. Charlton, Frederick, MD (US);
Katelyn J. Meixner, Columbia, MD (US);
The United States of America, as represented by Director National Security Agency, Washington, DC (US);
Abstract
The present invention discloses a method for comparing a camera fingerprint to a query fingerprint. An estimate of a camera fingerprint is obtained from a set of one or more images, and the query fingerprint is obtained from one or more images. Using these values, normalized cross-correlations values are determined for each possible alignment of the two fingerprints. Prior to calculating the noise floor, a set including the highest normalized cross-correlation values is identified. A universal noise floor is then calculated excluding this set from the noise floor calculation. The universal noise floor is utilized in calculating a correlation energy for each possible shift. The correlation energy values are then examined to determine whether the camera fingerprint and the query fingerprint match. A visualization tool may also be used to compare the camera fingerprint and the query fingerprint and determine whether the camera fingerprint and the query fingerprint match. The visualization tool may provide a plot utilizing surfaces or heat maps. The plots allow for a quick and easy analysis and determination as to whether the camera fingerprint and the query fingerprint match.