Security document carrying machine readable pattern

• US 8,009,893 B2
• Filed: 06/29/2009
• Issued: 08/30/2011
• Est. Priority Date: 05/08/1995
• Status: Expired due to Fees

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Rhoads, Geoffrey B., Rodriguez, Tony F.
• Primary Examiner(s): Johns; Andrew W
• Application Number:
  US12/493,983
• Publication Number:
  US 20100163629A1
• Time in Patent Office: 792 Days
• Field of Search: 382/100, 382/135, 382/137, 382/232, 380/54, 380/55, 283/72, 283/85, 283/93, 283/113, 283/901, 283/902, 340/5.86, 713/176, 358/3.28
• US Class Current: 382/135
• CPC Class Codes: G06T 1/0064 Geometric transfor invariant watermarking, e.g. affine transform invariant
• CPC Class Codes: G06T 2201/0052 Embedding of the watermark in the frequency domain
• CPC Class Codes: H04N 1/32144 embedded in the image data, i.e. enclosed or integrated in the image, e.g. watermark, super-imposed logo or stamp
• CPC Class Codes: H04N 1/32203 Spatial or amplitude domain methods H04N1/32309 takes precedence
• CPC Class Codes: H04N 1/32309 in colour image data
• CPC Class Codes: Y10S 283/902 Anti-photocopy

Abstract

The present invention relates generally to security documents (e.g., banknotes, ID documents, certificates, packaging, etc.). One claim recites a security document including a security pattern provided thereon. The security pattern includes a line structure in which lines width or line spacing is adjusted to convey a predefined, machine-readable pattern in a frequency transform domain. Another claim recites a security document including a security pattern provided thereon. The security pattern is provided in the security document through modifications to a color provided on the security document. The security pattern conveys a predefined, machine-readable pattern in a frequency transform domain. Of course, additional combinations and claims are provided as well.

Claims

1. A security document comprising:

a security pattern provided thereon and having a line structure in which line width or line spacing is adjusted to convey a predefined, machine-readable pattern in a frequency transform domain, wherein the security pattern is repeated across the security document.

2. A security document comprising:

a security pattern provided thereon and having a line structure in which line width or line spacing is adjusted to convey a predefined, machine-readable pattern in a frequency transform domain, wherein machine-readable pattern conveys a device control signal to control reproduction of the security document.

3. A security document comprising:

a security pattern provided thereon through modifications to a color provided on the security document, wherein the security pattern conveys a predefined, machine-readable pattern in a frequency transform domain, and wherein the security pattern is repeated across the security document.

4. A security document comprising:

a security pattern provided thereon through modifications to a color provided on the security document, wherein the security pattern conveys a predefined, machine-readable pattern in a frequency transform domain, and wherein the predefined, machine-readable pattern conveys a device control signal to control reproduction of the security document.

5. An apparatus comprising:

electronic memory configured to store data corresponding to a security document, wherein the security document comprises a security pattern having a line structure in which line width or line spacing have been adjusted to convey a predefined, machine-readable pattern in a frequency transform domain, wherein the security pattern is repeated across the security document; and

an electronic processor programmed to;

i) analyze the data corresponding to the security document in the frequency transform domain to obtain the predefined, machine-readable pattern; and

ii) control an action in response to obtaining the predefined, machine-readable pattern.

6. An apparatus comprising:

electronic memory configured to store a device control signal obtained from a security document, wherein the security document comprises a security pattern having a line structure in which line width or line spacing have been adjusted to convey a predefined, machine-readable pattern in a frequency transform domain, wherein the predefined, machine-readable pattern conveys the device control signal; and

an electronic processor programmed to control reproduction of the security document in response to the device control signal.

7. An apparatus comprising:

electronic memory configured to store data corresponding to a security document, wherein the security document comprises a security pattern provided thereon through modifications to a color provided on the security document, wherein the security pattern conveys a predefined, machine-readable pattern in a frequency transform domain, wherein the security pattern is repeated across the security document; and

an electronic processor programmed to;

i) analyze the data corresponding to the security document in the frequency transform domain to obtain the predefined, machine-readable pattern; and

ii) control an action in response to obtaining the predefined, machine-readable pattern.

8. An apparatus comprising:

electronic memory configured to store a device control signal obtained from a security document, wherein the security document comprises a security pattern provided thereon through modifications to a color provided on the security document, wherein the security pattern conveys a predefined, machine-readable pattern in a frequency transform domain, wherein the predefined, machine-readable pattern conveys the device control signal; and

an electronic processor programmed to control reproduction of the security document in response to the device control signal.

9. A non-transitory computer-readable storage medium having instructions stored thereon that, if executed by a computing device, cause the computing device to perform operations comprising:

analyzing data corresponding to a security document in a frequency transform domain to obtain a predefined, machine-readable pattern, wherein the security document comprises a security pattern having a line structure in which line width or line spacing have been adjusted to convey the predefined, machine-readable pattern in the frequency transform domain, and wherein the security pattern is repeated across the security document; and

controlling an action in based on the predefined, machine-readable pattern.

10. The computer-readable storage medium of claim 9, wherein the action comprises reproduction of the security document.

11. A non-transitory computer-readable storage medium having instructions stored thereon that, if executed by a computing device, cause the computing device to perform operations comprising:

analyzing data corresponding to a security document in a frequency transform domain to obtain a predefined, machine-readable pattern, wherein the security document comprises a security pattern provided thereon through modifications to a color, wherein the security pattern conveys the predefined, machine-readable pattern in the frequency transform domain, and wherein the security pattern is repeated across the security document; and

controlling an action in based on the predefined, machine-readable pattern.

12. The computer-readable storage medium of claim 11, wherein the action comprises reproduction of the security document.

13. A method comprising:

analyzing data corresponding to a security document in a frequency transform domain to obtain a predefined, machine-readable pattern, wherein the security document comprises a security pattern having a line structure in which line width or line spacing have been adjusted to convey the predefined, machine-readable pattern in the frequency transform domain, and wherein the security pattern is repeated across the security document; and

controlling an action in based on the predefined, machine-readable pattern.

14. The method of claim 13, wherein the action comprises reproduction of the security document.

15. A method comprising:

analyzing data corresponding to a security document in a frequency transform domain to obtain a predefined, machine-readable pattern, wherein the security document comprises a security pattern provided thereon through modifications to a color, wherein the security pattern conveys the predefined, machine-readable pattern in the frequency transform domain, and wherein the security pattern is repeated across the security document; and

controlling an action in based on the predefined, machine-readable pattern.

16. The method of claim 15, wherein the action comprises reproduction of the security document.