Methods for identifying imaging devices and classifying images acquired by unknown imaging devices
AssigneeForensic Pathways
InventorsLi Chang-Tsun, Richard Leary
Life of this patent
Estimating the term…
Abstract
A method of classifying an image taken by an image capture device, the method comprising the steps of: extracting an initial Sensor Noise Pattern (SNP) for the image; enhancing the initial SNP to create an enhanced SNP by applying a correcting model, wherein the correcting model scales the initial SNP by a factor inversely proportional to the signal intensity of the initial SNP; determining a similarity measure between the enhanced SNP for said image with one or more previously calculated enhanced SNPs for one or more different images; and classifying the image in a group of one or more images with similar or identical SNPs based on the determined similarity measure.
Claims25
A method of classifying an image taken by an image capture device, the method comprising the steps of:
- extracting an initial Sensor Noise Pattern (SNP) for the image;
- enhancing the initial SNP to create an enhanced SNP by applying a correcting model, wherein the correcting model scales the initial SNP by a factor which decreases as the magnitude of signal intensity of the initial SNP increases;
- determining a similarity measure between the enhanced SNP for said image with one or more previously calculated enhanced SNPs for one or more different images;
- and
- classifying the image in a group of one or more images with similar or identical SNPs based on the determined similarity measure.
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An apparatus for classifying an image taken by an imaging capturing device, the apparatus comprising:
- a processor enabled to extract an initial Sensor Noise Pattern (SNP) from the image;
- an enhancer enabled to enhancer the initial SNP to create an enhanced SNP by applying a correcting model, wherein the correcting model scales the initial SNP by a factor which decreases as the signal intensity of the initial SNP increases;
- a similarity measurer to determine the similarity between the enhanced SNP for said image with one or more previously calculated enhanced SNPs for one or more different images;
- and
- classifier to group of one or more images with similar or identical SNPs based on the determined similarity measure.
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Dependencies are inferred from the claim text.