Steganographic encoding and decoding

• US 9,325,878 B2
• Filed: 03/17/2015
• Issued: 04/26/2016
• Est. Priority Date: 07/02/2004
• Status: Active Grant

• Current Assignee: Digimarc Corporation
• Original Assignee: Digimarc Corporation
• Inventors: Reed, Alastair M., Sharma, Ravi K., Rodriguez, Tony F.
• Primary Examiner(s): Johns, Andrew W
• Application Number:
  US14/660,568
• Publication Number:
  US 20150310576A1
• Time in Patent Office: 406 Days
• US Class Current: 1/1
• CPC Class Codes: G06T 1/0021 Image watermarking
• CPC Class Codes: G06T 1/005 Robust watermarking, e.g. average attack or collusion attack resistant
• CPC Class Codes: G06T 11/001 Texturing; Colouring; Generation of texture or colour inpainting G06T5/77
• CPC Class Codes: G06T 2201/0083 whereby only watermarked image required at decoder, e.g. source-based, blind, oblivious
• 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 1/32267 combined with processing of the image
• CPC Class Codes: H04N 1/32309 in colour image data
• CPC Class Codes: H04N 1/6005 with luminance or chrominance signals, e.g. LC1C2, HSL or YUV
• CPC Class Codes: H04N 1/6008 with primary colour signals, e.g. RGB or CMY(K)
• CPC Class Codes: H04N 2201/3228 further additional information (metadata) being comprised in the identification information
• CPC Class Codes: H04N 2201/3233 of authentication information, e.g. digital signature, watermark
• CPC Class Codes: H04N 2201/327 which are undetectable to the naked eye, e.g. embedded codes

Abstract

This patent document relates generally to steganography and digital watermarking. One claim recites an apparatus comprising: memory for storing data representing an image or video, in which the data comprises first data corresponding to first color data, second data corresponding to second color data and third data corresponding to third color data, the image or video to host auxiliary information; a processor programmed for: weighting the first data, the second data and the third data according to at least the following two factors: i) a color direction associated with an expected embedding direction; and ii) expected image capture or signal processing; and determining from weighted first data, weighted second data and weighted third data, changes in one or more image or video attribute(s), in which the auxiliary information is conveyed through the changes. Of course, other claims and combinations are provided too.

Claims

1. A method comprising:

receiving data representing image or video, in which the data comprises first data corresponding to first color data, second data corresponding to second color data and third data corresponding to third color data, the image or video to host auxiliary information;

using a configured electronic processor;

weighting the first data, the second data and the third data according to at least the following two factors;

i) a color direction associated with an expected embedding direction; and

ii) expected image capture or signal processing; and

determining from weighted first data, weighted second data and weighted third data, changes in one or more image or video attribute(s), in which the auxiliary information is conveyed through the changes.

2. The method of claim 1 in which the data is weighted for detection in a blue-yellow direction.

3. The method of claim 2 in which the first data, second data and third data respectively correspond to red, green and blue.

4. The method of claim 1 in which the first data, second data and third data are respectively associated with cyan, magenta and yellow.

5. A non-transitory computer readable medium comprising instructions stored therein, said instructions cause an electronic processor to perform the method of claim 1.

6. A programmed computing device comprising instructions stored in memory to cause said programmed computing device to perform the method of claim 1.

7. An apparatus comprising:

memory for storing data representing an image or video, in which the data comprises first data corresponding to first color data, second data corresponding to second color data and third data corresponding to third color data, the image or video to host auxiliary information;

a processor programmed for;

weighting the first data, the second data and the third data according to at least the following two factors;

i) a color direction associated with an expected embedding direction; and

ii) expected image capture or signal processing; and

determining from weighted first data, weighted second data and weighted third data, changes in one or more image or video attribute(s), in which the auxiliary information is conveyed through the changes.

8. The apparatus of claim 7 in which the data is weighted for detection in a blue-yellow direction.

9. The apparatus of claim 8 in which the first data, second data and third data respectively correspond to red, green and blue.

10. The apparatus of claim 7 in which the first data, second data and third data are respectively associated with cyan, magenta and yellow.

11. An apparatus comprising:

means for storing data representing an image or video, in which the data comprises first data corresponding to first color data, second data corresponding to second color data and third data corresponding to third color data, the image or video to host auxiliary information;

means for adjusting the first data, the second data and the third data according to at least the following two factors;

i) a color direction associated with an expected embedding direction; and

ii) expected image capture or signal processing; and

means for generating changes for one or more image or video attributes for the adjusted first data, adjusted second data and adjusted third data, in which the auxiliary information is conveyed through the changes; and

means for transforming the adjusted first data, adjusted second data and the adjusted third data with generated changes.

12. The apparatus of claim 11 in which the data is adjusted for detection in a blue-yellow direction.

13. The apparatus of claim 12 in which the first data, second data and third data respectively correspond to red, green and blue.

14. The apparatus of claim 11 in which the first data, second data and third data are respectively associated with cyan, magenta and yellow.