The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 11, 2003
Filed:
Jan. 04, 2000
Cornelis W. A. M. Van Overveld, Eindhoven, NL;
Peter M. J. Rongen, Eindhoven, NL;
Maurice J. J. J.-B. Maes, Eindhoven, NL;
Koninklijke Philips Electronics N.V., Eindhoven, NL;
Abstract
A method and arrangement for embedding a watermark in an image are disclosed. The watermark consists of a pseudo-random, dense subset of image pixels, e.g. a pattern of lines ( ). A number of salient image pixels ( ), for example, local extremes, corners or edges, is identified and it is determined whether they lie on (i.e. within a vicinity &dgr; of) the line pattern ( ) or not ( ). In an unwatermarked image (FIG. A), the number of most salient pixels ( ) lying on the watermark is substantially the same as the number of most salient pixels ( ) not lying on the watermark. The image is watermarked (FIG. B) by modifying the saliency of the salient pixels in such a way that a significant majority ( ) of the most salient pixels ( ) is eventually located within the vicinity of the line pattern.