Three dimensional data storage

• US 7,225,991 B2
• Filed: 04/16/2004
• Issued: 06/05/2007
• Est. Priority Date: 04/16/2003
• Status: Expired due to Fees

• Current Assignee: L-1 Secure Credentialing, LLC (Advent International Corporation)
• Original Assignee: Digimarc Corporation
• Inventors: Jones, Robert L., Kenen, Leo M.
• Primary Examiner(s): Le; Thein M.
• Assistant Examiner(s): Labaze; Edwyn
• Application Number:
  US10/825,852
• Publication Number:
  US 20050040240A1
• Time in Patent Office: 1,145 Days
• Field of Search: 235487-488, 235/380, 235/454, 235/469, 235/494, 382162-167
• US Class Current: 235/487
• CPC Class Codes: G06K 19/06018 one-dimensional coding
• CPC Class Codes: G06K 19/06037 multi-dimensional coding
• CPC Class Codes: G06K 19/06046 Constructional details
• CPC Class Codes: G06K 19/06056 the marking comprising a further embedded marking, e.g. a 1D bar code with the black bars containing a smaller sized coding
• CPC Class Codes: G06K 19/14 the marking being sensed by radiation
• CPC Class Codes: G06K 7/1417 2D bar codes

Abstract

An identification document is provided comprising a printable layer, a computer readable data storage element, and a computer readable calibration element. The computer readable data storage element is formed on the printable layer and comprises a plurality of pixels, wherein each pixel has one of a predetermined plurality of colors. The computer readable calibration element is formed on the printable layer and comprises a plurality of pixels and includes information enabling a determination of the pixel size in the computer readable data storage element and also a determination of at least a portion of the predetermined plurality of colors.

Claims

1. An identification document, comprising:

a printable layer;

a computer readable data storage element formed on the printable layer, the computer readable data storage element comprising a plurality of pixels, wherein each pixel has one of a predetermined plurality of colors;

a computer readable calibration element formed on the printable layer, the calibration element comprising a plurality of pixels and the calibration element including information enabling a determination of at least a portion of the predetermined plurality of colors;

wherein the computer readable data storage element includes a plurality of pixels that have been selectively darkened or whitened relative to the calibration element by laser radiation to encode machine readable data in the computer readable storage element.

2. The identification document of claim 1, wherein the computer readable data storage element and the computer readable calibration element are printed using the same type of printing.

6. The identification document of claim 1, wherein the pixels of the computer readable data storage element are spaced apart from each other by one or more predetermined pixel spacings and where the computer readable data calibration element further comprises infomiation enabling a determination of at least one of the pixel spacings.

8. The identification document of claim 1, wherein the computer readable calibration element is disposed near the computer readable data storage element.

9. The identification document of claim 1, wherein the identification document further comprises personalized data printed to the printable layer and wherein the computer readable data storage element comprises data, associated with at least a portion of the personalized data.

10. The identification document of claim 1, wherein the computer readable data storage element comprises encrypted data.

11. The system of claim 10, further comprising means formed on the printable document substrate for determining the size of each pixel in the computer readable array of pixels.

12. The system of claim 10, further comprising means formed on the printable substrate for determining the spacing between the pixels in the computer readable array of pixels.

13. The identification document of claim 1 including a laser sensitizing additive layer for receiving the laser radiation.

14. The identification document of claim 13 wherein the laser sensitizing additive layer comprises a laminate layer.

3. The identification document of claim, wherein the printing is laser engraving.

4. The identification document of claim 3, wherein at least one of the pixels in the computer readable data storage element is capable of being changed alter printing by application of additional laser radiation to die pixel.

5. The identification document of claim 4, wherein the change is at least one of darkening the pixel and clearing the pixel.

7. The identification document of claim, wherein at least one of the computer readable data storage element and the computer readable calibration element is positioned at a predetermined location on the printable layer.

15. A system for providing a primed computer readable data storage element on document, comprising:

a printable document substrate;

a computer readable array of pixels printed on the document substrate; and

means formed on the printable document substrate for calibrating the intensity of each pixel in the computer readable array of pixels;

wherein the computer readable array includes a plurality of pixels that have been selectively darkened or whitened relative to the means for calibrating the intensity by laser radiation to encode machine readable data in the computer readable array.

16. The system of claim 15 wherein the printable document substrate includes a laser sensitizing additive layer for receiving the laser radiation.

17. The system of claim 16 wherein the laser sensitizing additive layer comprises a laminate layer.

18. A method for providing a printed computer readable data element to a document, comprising:

printing a first plurality of pixels to a first location on a document, each pixel having a pixel intensity, each pixel intensity associated with a respective piece of data;

printing a second plurality of pixels to second location on the document, the second plurality of pixels comprising at least one pixel associated with each possible pixel intensity;

printing a third plurality of pixels to a third location on the document, the third plurality of pixels comprising a pair of pixels spaced apart and capable of being scanned by a scanner; and

;

printing a fourth plurality of pixels to a fourth location on the document, the fourth plurality of pixels spaced a predetermined distance from the second and third pluralities of pixels, the fourth plurality of pixels serving to reference the locations of the second and third pluralities of pixels;

wherein the first plurality of pixels includes a plurality of pixels that have been selectively darkened or whitened by laser radiation to correspond to pixel intensities of the second plurality of pixels and thereby encode machine readable data associated with the possible pixel intensities of the second plurality of pixels.

19. The method of claim 18, wherein the first plurality of pixels can be interpreted by first scanning at least one of the second, third, and fourth pluralities of pixels.

20. The method of claim 18, further comprising printing a reference pixel to a fourth location on the document, the reference pixel spaced a predetermined distance from the fourth plurality of pixels and from the first plurality of pixels, the reference pixel helping to define at least one predetermined pixel intensity.

21. The method of claim 18, wherein the pixels in each plurality are printed by laser engraving.

22. The method of claim 21, wherein at least one of the pixels in the first plurality can be changed by applying additional laser radiation to the pixel.

23. The method of claim 22, wherein the additional laser radiation darkens the pixel.

24. The method of claim 22, wherein the additional laser radiation clean the pixel.

25. The method of claim 18 including applying a laser sensitizing additive layer for receiving the laser radiation.

26. The method of claim 25 wherein the laser sensitizing additive layer comprises a laminate layer.