Forensic verification utilizing forensic markings inside halftones

1. A non-transitory computer readable medium comprising computer executable instructions that when executed cause a processor to:

extract an interior of a halftone of an image of printed media, wherein at least a portion of the interior of the halftone is encoded with a print signature;

authenticate the printed media based on a forensic-level statistical image analysis,

wherein the forensic-level statistical analysis comprises:

accessing a reference signature stored in a registry, wherein an interior of the reference signature is encoded with payload information, wherein the payload information is employed to index the print signature;

comparing the print signature to the payload information to determine differences between the print signature and the payload information; and

verifying that the printed media is authentic based on the comparison.

2. The non-transitory computer readable medium of claim 1 , wherein the halftone is encoded with the payload information to form a stegatone.

3. The non-transitory computer readable medium of claim 1 , further comprising a preprocessor to preprocess the halftone via a bandpass filter to mitigate low and high frequencies within a captured image.

4. The non-transitory computer readable medium of claim 3 , wherein the preprocessor employs a difference analyzer that subtracts an image from an aligned captured hardcopy to produce a difference signal image.

5. The non-transitory computer readable medium of claim 1 , further comprising a subdivide area processor that processes the halftone via an equi-spaced grid to segment the halftone into smaller processing portions to mitigate computing and storage requirements.

6. The non-transitory computer readable medium of claim 5 , wherein the subdivide area processor processes the halftone according to concentric regions of an image to mitigate computing and storage requirements.

7. The non-transitory computer readable medium of claim 5 , further comprising an area code generator to produce a print signature based on output from the subdivide area processor.

8. The non-transitory computer readable medium of claim 7 , wherein the area code generator determines a normalized variance for each processing portion generated by the subdivide area processor.

9. A non-transitory computer readable medium comprising computer executable instructions that when executed cause a processor to:

extract a print signature from an interior of a halftone of an image of printed media, wherein the halftone is encoded with payload information;

compare the print signature to a reference signature stored in a registry to determine differences between the print signature and the reference signature; and

perform a forensic-level statistical image analysis on the print signature and the reference signature based on the comparison to authenticate the printed media,

wherein the halftone is generated with a unique payload to form a one-to-one mapping between the print signature and the payload information.

10. A non-transitory computer readable medium comprising computer executable instructions that when executed cause a processor to:

extract a print signature from an interior of a halftone of an image of printed media, wherein the halftone is encoded with payload information;

compare the print signature to a reference signature stored in a registry to determine differences between the print signature and the reference signature; and

perform a forensic-level statistical image analysis on the print signature and the reference signature based on the comparison to authenticate the printed media,

wherein the halftone is generated with a common payload to form a many-to-one mapping between the print signature and the payload information.

11. A method, comprising:

recovering a print signature from an interior of a halftone of a captured image of printed media, wherein the halftone is encoded with the print signature;

accessing a reference signature stored in a registry, wherein an interior of the reference signature is encoded with payload information, wherein the payload information is employed to index the print signature;

comparing the print signature to the payload information to determine differences between the print signature and the payload information; and

verifying that the printed media is authentic based on the comparison.

12. The method of claim 11 , wherein the halftone is encoded with the payload information to form a stegatone,

further comprising performing bandpass filtering or digital subtraction on the stegatone to facilitate further image analysis.

13. The method of claim 12 , further comprising subdividing the halftone to mitigate computing and storage requirements.

14. A system comprising:

a memory for storing computer executable instructions; and

a processing unit for accessing the memory and executing the computer executable instructions, the computer executable instructions comprising:

a preprocessor to generate a filtered signal or a difference signal from a captured image of printed media;

a subdivide area processor to segment the filtered signal or the difference signal in preparation of further image processing of the captured image of printed media;

an area code generator to process segmented output from the subdivide area processor and to recover a print signature from an interior of a halftone that is encoded with payload information; and

a forensic verification system to authenticate the printed media by comparing the recovered print signature with a reference signature stored in a print signature registry, wherein the reference signature comprises payload information that is employed to index the print signature and comprises a unique payload to form a one-to-one mapping between the print signature and the payload information or a common payload to form a many-to-one mapping between the print signature and the payload information.