Length-modulated screening lines and line codes
View Patent ↗Some implementations provide a computer-assisted method for embedding information in an identification document. The method includes: modulating information by varying lengths of line segments; generating a line code that includes the line segments with corresponding lengths; and applying the line code on an identification document such that the information is used to authenticate the identification document as genuine when a person presents the identification document to verify an identify of the person.
1. A method for embedding information in an identification document, the method comprising:
encoding information by varying lengths of multiple line segments;
generating a line code that includes the multiple line segments with corresponding lengths;
generating a line code repository to store data encoding correspondences between the multiple line segments of varying lengths and encoded information; and
applying the line code on an identification document such that the encoded information is used to authenticate the identification document as genuine when a person presents the identification document to verify an identify of the person.
2. The method of claim 1 , wherein applying the line code comprises at least one of:
applying the line code at a background region of the identification document; or
applying the line code as a screen of an image region of the identification document.
3. The method of claim 1 , wherein the line code encodes at least one of: personally identifiable information from the identification document, information pointing to an issuing authority of the identification document, or a universal resource locator (URL) address.
4. The method of claim 1 , wherein generating the line code comprises:
generating the line code with error correction data.
5. The method of claim 1 , wherein generating the line code comprises:
hiding a starting position or an ending position of the line code by using a mirror technique.
6. The method of claim 1 , wherein generating the line code comprises:
converting the multiple line segments into arc segments for subsequent application to the identification document.
7. A system for embedding information in an identification document, the system comprising a processor configured to perform operations of:
encoding information by varying lengths of multiple line segments;
generating a line code that includes the multiple line segments with corresponding lengths;
generating a line code repository to store data encoding correspondences between the multiple line segments of varying lengths and encoded information; and
applying the line code on an identification document such that the encoded information is used to authenticate the identification document as genuine when a person presents the identification document to verify an identify of the person.
8. The system of claim 7 , wherein causing the line code to be applied comprises at least one of:
causing the line code to be applied at a background region of the identification document; or
causing the line code to be applied as a screen of an image region of the identification document.
9. The system of claim 7 , wherein the line code encodes at least one of: personally identifiable information from the identification document, information pointing to an issuing authority of the identification document, or a universal resource locator (URL) address.
10. The system of claim 7 , wherein generating the line code comprises:
generating the line code with error correction data.
11. The system of claim 7 , wherein generating the line code comprises:
hiding a starting position or an ending position of the line code by using a mirror technique.
12. The system of claim 7 , wherein generating the line code comprises:
converting the multiple line segments into arc segments for subsequent application to the identification document.
13. A non-transitory computer-readable medium comprising software instructions that, when executed by a computer processor, cause the computer processor to perform operations of:
encoding information by varying lengths of multiple line segments;
generating a line code that includes the multiple line segments with corresponding lengths;
generating a line code repository to store data encoding correspondences between the multiple line segments of varying lengths and encoded information; and
applying the line code on an identification document such that the encoded information is used to authenticate the identification document as genuine when a person presents the identification document to verify an identify of the person.
14. The non-transitory computer-readable medium of claim 13 , wherein causing the line code to be applied comprises at least one of:
causing the line code to be applied at a background region of the identification document; or
causing the line code to be applied as a screen of an image region of the identification document.
15. The non-transitory computer-readable medium of claim 13 , wherein the line code encodes at least one of: personally identifiable information from the identification document, information pointing to an issuing authority of the identification document, or a universal resource locator (URL) address.
16. The non-transitory computer-readable medium of claim 13 , wherein generating the line code comprises:
generating the line code with error correction data.
17. The non-transitory computer-readable medium of claim 13 , wherein generating the line code comprises:
hiding a starting position or an ending position of the line code by using a mirror technique.
18. The non-transitory computer-readable medium of claim 13 , wherein generating the line code comprises:
converting the multiple line segments into arc segments for subsequent application to the identification document.