| US 7,561,715 B2 | ||
| Method and arrangement for watermark detection | ||
| Johan Cornelis Talstra, Eindhoven (Netherlands); Job Cornelis Oostveen, Eindhoven (Netherlands); Gerrit Cornelis Langelaar, Eindhoven (Netherlands); Antonius Adrianus Cornelis Maria Kalker, Eindhoven (Netherlands); and Maurice Jerome Justin Jean-Baptiste Maes, Eindhoven (Netherlands) | ||
| Assigned to Koninklijke Philips Electronics N.V., Eindhoven (Netherlands) | ||
| Appl. No. 10/525,483 PCT Filed Aug. 12, 2003, PCT No. PCT/IB03/03594 § 371(c)(1), (2), (4) Date Feb. 23, 2005, PCT Pub. No. WO2004/021277, PCT Pub. Date Mar. 11, 2004. |
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| Claims priority of application No. 02078544 (EP), filed on Aug. 28, 2002. | ||
| Prior Publication US 2006/0126887 A1, Jun. 15, 2006 | ||
| Int. Cl. G06K 9/00 (2006.01); H04N 7/167 (2006.01) | ||
| U.S. Cl. 382—100 [382/166; 380/200] | 16 Claims |
| 1. A method, comprising:
examining a video signal being generated by a computer system and applied to a display screen to locate image areas in which
the video signal changes from frame to frame;
converting RGB pixel values in the video signal into luminance values (Y) in order to determine luminance values of Y as R/4+G/2+B/8,
where R is a red component, G is a green component, and B is a blue component of the RGB pixel values:
defining a bounding box around the image areas to provide an area of interest; and
detecting a watermark in said area of interest.
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