5,754,673 A* 5/1998 Brooks et al............... 382/112 5,768,426 A 6/1998 Rhoads.......................
282/232 5,774,452 A 6/1998 Wolosewicz 5,809,139 A 9/1998 Girod et al. 5,828,325 A …

The disclosure describes systems for creating and authenti cating printed objects using
authentication and copy detec tion Watermarks. For example, one veri? cation system …

Methods and apparatus for embedding digital watermarks into a digital host content are
provided. A digital host content is received, eg, at a receiver or other device incorporating a …

3,838,444 A 9/1974 Loughlin et al. A watermarking method converts a watermark message
into 3,845,391 A* 10/1974 Crosby........................ 325/64 a Frequency Shift Keying (FSK) …

The present invention relates to methods for protecting a data signal using the following
techniques: applying a data reduc tion technique to reduce the data signal into a reduced …

US PATENT DOCUMENTS 2002.0068987 A1 6/2002 Hars 2002fO069107 A1 6, 2002
Werner 5,640,193 A 6, 1997 Wellner 2002/0069218 A1 6/2002 Sull et al................. T15 …

(57) ABSTRACT A method of extracting a watermark from watermarked data includes
extracting a plurality of watermarks from the watermarked original data, calculating reliability …

US9710871B2 - Geometric enumerated watermark embedding for spot colors - Google Patents
US9710871B2 - Geometric enumerated watermark embedding for spot colors - Google Patents …

(52) US Cl.......................... 382/100; 382/250; 713/176 Methods and systems for watermarking
of digital images are (58) Field of Classification Search.................. 382/100, presented. In one …

US PATENT DOCUMENTS 3,406,344 A 10/1968 Hopper 3,842,196 A 10/1974 Loughlin
3,885,217 A 5, 1975 Cintron 3,894,190 A 7, 1975 Gassmann 3,919,479 A 11/1975 Moon et …