Global metadata embedding and decoding

• US 8,156,153 B2
• Filed: 07/25/2008
• Issued: 04/10/2012
• Est. Priority Date: 04/22/2005
• Status: Expired due to Fees

• Current Assignee: Microsoft Technology Licensing LLC (Microsoft Corporation)
• Original Assignee: Microsoft Corporation
• Inventors: Wang, Jian, Lin, Zhouchen, Li, Yue, Zhang, Chunhui, Dang, Yingnong, Wu, Jiang, Wang, Qiang
• Primary Examiner(s): Kerzhner, Aleksandr
• Application Number:
  US12/180,484
• Publication Number:
  US 20090119573A1
• Time in Patent Office: 1,355 Days
• Field of Search: 707/801, 707/999.1, 235/472.03, 235/462.49, 235/494
• US Class Current: 707/801
• CPC Class Codes: G06F 3/0321 by optically sensing the absolute position with respect to a regularly patterned surface forming a passive digitiser, e.g. pen optically detecting position indicative tags printed on a paper sheet constructional details of pen-shaped pointing devices G06F3/03545, G06F3/03542, G06F3/037
• CPC Class Codes: G06F 3/03545 Pens or stylus
• CPC Class Codes: G06F 40/171 by use of digital ink

Abstract

Global metadata, such as a document identifier, which may be a globally unique identifier, is embedded into an embedded interactive code document by combining a first m-array and a plurality of copies of the first m-array to generate a combined m-array with encoded global metadata such that respective start positions (x_d, y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array are each shifted, by respective amounts that are based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array. Global metadata may be decoded from the combined m-array by determining the respective amounts by which the plurality of copies of the first m-array are shifted, relative to the first m-array, in the combined m-array and by combining the respective amounts to produce a decoded value of the global metadata.

Claims

1. A system, having a memory and a processor, that embeds global metadata into an embedded interactive code document, the system comprising:

a first m-array that contains a first repeating sequence of bits;

global metadata that specifies a document-identification information for the embedded interactive code document;

a copy of the first m-array;

a global-metadata-encoding module that combines the first m-array and the copy of the first m-array to generate a combined m-array with encoded global metadata such that a start position (x_d,y_d)ⁱ of the copy of the first m-array in the combined m-array is shifted relative to a start position of the first m-array in the combined m-array based on the global metadata and wherein at least a first portion of the first m-array and at least a second portion of the shifted copy of the first m-array overlap in the combined m-array so the first portion and the second portion have an area in common; and

an embedding module configured to embed the combined m-array into the embedded interactive code document,

wherein the global-metadata-encoding module comprises computer-executable instructions stored in memory for execution by the system.

2. The system of claim 1, wherein the first m-array is a position m-array.

3. The system of claim 2, wherein the copy of the first m-array is a global-metadata m-array.

4. The system of claim 1 wherein the first m-array and the shifted copy of the first m-array completely overlap in the combined m-array.

5. A system, having a memory and a processor, that embeds global metadata into an embedded interactive code document, the system comprising:

a first m-array that contains a first repeating sequence of bits;

global metadata that specifies a document-identification information for the embedded interactive code document;

a plurality of copies of the first m-array; and

a global-metadata-encoding module that combines the first m-array and the plurality of copies of the first m-array to generate a combined m-array with encoded global metadata such that respective start positions (x_d,y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array are each shifted, by respective amounts that are based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array,

wherein the respective start positions (x_d,y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array are calculated as

6. The system of claim 5, wherein the global metadata is a globally unique identifier.

7. A system, having a memory and a processor, configured to decode global metadata from an embedded interactive code document, the system comprising:

a combined m-array, captured from the embedded interactive code document, with encoded global metadata, wherein global metadata is encoded in the combined m-array via a start position (x_d,y_d) of a copy of a first m-array in the combined m-array being shifted, by an amount that is based on the global metadata, relative to a start position of the first m-array in the combined m-array with encoded global metadata, wherein at least a first portion of the first m-array and at least a second portion of the shifted cony of the first m-array overlap in the combined m-array so the first portion and the second portion have an area in common; and

a global-metadata-decoding module configured to decode the global metadata from the combined m-array by determining an amount by which the start position of the copy of the first m-array is shifted, relative to the first m-array, in the combined m-array

wherein the global-metadata-decoding module comprises computer-executable instructions stored in memory for execution by the system.

8. The system of claim 7, wherein the first m-array is a position m-array and the copy of the first m-array is a global-metadata m-array.

9. The system of claim 7, wherein the global-metadata-decoding module if configured to decode, from the combined m-array, the first m-array and the copy of the first m-array separately from one another.

10. The system of claim 9, wherein the global-metadata-decoding module is configured to determine a first position (x_p,y_p) of a point P in the first m-array and a shifted position (x_m,y_m)ⁱ of the point P in the copy of the first m-array.

11. A system, having a memory and a processor, that decodes global metadata from an embedded interactive code document, the system comprising:

a combined m-array with encoded global metadata, wherein global metadata is encoded in the combined m-array via respective start positions (x_d,y_d)ⁱ of a plurality of copies of a first m-array in the combined m-array being shifted, by an amount that is based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array with encoded global metadata;

a global-metadata-decoding module that decodes the global metadata from the combined m-array by determining the respective amounts by which the plurality of copies of the first m-array are shifted, relative to the first m-array, in the combined m-array and by combining the respective amounts to produce a decoded value of the global metadata,

wherein the first m-array is a position m-array and the plurality of copies of the first m-array are global-metadata m-arrays,

wherein the global-metadata-decoding module decodes, from the combined m-array, the first m-array and each of the plurality of copies of the first m-array separately from one another,

wherein the global-metadata-decoding module determines a first position (x_p,y_p) of a point P in the first m-array and respective shifted positions (x_m,y_m)ⁱ of the point P in the plurality of copies of the first m-array,

wherein the global-metadata-decoding module calculates respective values for the portions of global metadata as

12. The system of claim 11, wherein, for a plurality of images of the embedded interactive code document, respective values of global metadata portion, that occur most often are selected for use as respective global metadata portion values for calculating the decoded value of the global metadata.

13. The system of claim 12, wherein the decoded value of the global metadata is calculated as

14. A computer-readable medium storing computer-executable instructions for embedding global metadata into an embedded interactive code document, the instructions comprising:

instructions for combining a first m-array and a plurality of copies of the first m-array to generate a combined m-array with encoded global metadata such that respective start positions (x_d,y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array are each shifted, by respective amounts that are based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array wherein at least a first portion of the first m-array and at least a second portion of a shifted copy of the first m-array overlap in the combined m-array so the first portion and the second portion have an area in common; and

instructions for embedding the combined m-array into the embedded interactive code document.

15. A computer-readable medium storing computer-executable instructions for embedding global metadata into an embedded interactive code document by combining a first m-array and a plurality of copies of the first m-array to generate a combined m-array with encoded global metadata such that respective start positions (x_d,y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array are each shifted, by respective amounts that are based on respective portions of the global metadata, relative to a start position of the first m-array in the combined m-array and having further computer-executable instructions for calculating the respective start positions (x_d,y_d)ⁱ of the plurality of copies of the first m-array in the combined m-array as

16. The computer-readable medium of claim 15, having further computer-executable instructions for decoding the global metadata from the combined m-array by determining the respective amounts by which the plurality of copies of the first m-array are shifted, relative to the first m-array, in the combined m-array and by combining the respective amounts to produce a decoded value of the global metadata.

17. The computer-readable medium of claim 16, having further computer-executable instructions for decoding, from the combined m-array, the first m-array and each of the plurality of copies of the first m-array separately from one another.

18. The computer-readable medium of claim 17, having further computer-executable instructions for determining a first position (x_p,y_p) of a point P in the first m-array and respective shifted positions (x_m,y_m)ⁱ of the point P in the plurality of copies of the first m-array.

19. The computer-readable medium of claim 18, having further computer-executable instructions for calculating respective values for portions of the global metadata as

20. The computer-readable medium of claim 19, having further computer-executable instructions for selecting, for a plurality of images of the embedded interactive code document, respective values, which occur most often, of global metadata portion_i for use as respective global metadata portion values for calculating the decoded value of the global metadata.

21. The computer-readable medium of claim 20, having further computer-executable instructions for calculating the decoded value of the global metadata as