Methods and apparatus for enhancing the robustness of watermark extraction from digital host content
First Claim
1. A method for enhancing the robustness of watermark extraction from digital host content, comprising:
- receiving a digital host content at a reception device;
extracting embedded watermarks from the host content, using an extraction device, in accordance with a stego key, the extracting comprising;
(a) extracting a first watermark;
(b) determining a number of errors in the first extracted watermark; and
if the number of errors is above a first pre-determined value;
(c) extracting at least a second watermark;
(d) determining a number of errors in at least the second extracted watermark; and
if the number of errors in at least the second extracted watermark is above a second pre-determined value, combining the extraction results of steps (a) and (c) to cumulatively assess validity of the first extracted watermark and at least the second extracted watermark; and
controlling an operation of a content handling device in accordance with the cumulative assessment.
4 Assignments
0 Petitions
Accused Products
Abstract
Methods and apparatus for enhancing the robustness of watermark extraction from digital host content are provided. Embedded watermarks may be extracted from received digital host content in accordance with a stego key. A first watermark is extracted and a number of errors in the first extracted watermark is assessed. If the number of errors is above a first pre-determined value, at least a second watermark is extracted from the host content. A number of errors in at least the second extracted watermark is assessed. If the number of errors in at least the second extracted watermark is above a second pre-determined value, the extraction results for the extracted watermarks are combined in order to cumulatively assess the validity of the first extracted watermark and at least the second extracted watermark.
143 Citations
24 Claims
-
1. A method for enhancing the robustness of watermark extraction from digital host content, comprising:
-
receiving a digital host content at a reception device; extracting embedded watermarks from the host content, using an extraction device, in accordance with a stego key, the extracting comprising; (a) extracting a first watermark; (b) determining a number of errors in the first extracted watermark; and if the number of errors is above a first pre-determined value; (c) extracting at least a second watermark; (d) determining a number of errors in at least the second extracted watermark; and if the number of errors in at least the second extracted watermark is above a second pre-determined value, combining the extraction results of steps (a) and (c) to cumulatively assess validity of the first extracted watermark and at least the second extracted watermark; and controlling an operation of a content handling device in accordance with the cumulative assessment. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
-
-
16. Apparatus for enhancing the robustness of watermark extraction from digital host content, comprising:
-
a receiver configured to receive a digital host content; an extractor for extracting embedded watermarks from the host content in accordance with a stego key, the extractor configured to; (a) extract a first watermark; (b) compute a number of errors in the first extracted watermark; and if the number of errors is above a first pre-determined value; (c) extract at least a second watermark; (d) compute a number of errors in at least the second extracted watermark; and if the number of errors in at least the second extracted watermark is above a second pre-determined value, combine the extraction results of steps (a) and (c) to cumulatively assess the validity of the first extracted watermark and at least the second extracted watermark. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
-
-
24. A computer-readable storage medium with a digital host content embodied thereupon, the host content comprising:
-
one or more auxiliary information symbols that are imperceptibly embedded in the host content, wherein reception of the host content by a content handling device equipped with a watermark extractor triggers the watermark extractor to; (a) extract a first watermark; (b) determine a number of errors in the first extracted watermark; and if the number of errors is above a first pre-determined value; (c) extract at least a second watermark; (d) determine a number of errors in at least the second extracted watermark; and if the number of errors in at least the second extracted watermark is above a second pre-determined value, combine the extraction results of steps (a) and (c) to cumulatively assess validity of the first extracted watermark and at least the second extracted watermark.
-
Specification