EP 2815378 A1 20141224 - METHOD FOR INSERTING A DIGITAL MARK INTO AN IMAGE, AND CORRESPONDING METHOD FOR DETECTING A DIGITAL MARK IN AN IMAGE TO BE ANALYSED
Title (en)
METHOD FOR INSERTING A DIGITAL MARK INTO AN IMAGE, AND CORRESPONDING METHOD FOR DETECTING A DIGITAL MARK IN AN IMAGE TO BE ANALYSED
Title (de)
VERFAHREN ZUR EINFÜGUNG EINER DIGITALEN MARKIERUNG IN EIN BILD UND ENTSPRECHENDES VERFAHREN ZUR ERKENNUNG EINER DIGITALEN MARKIERUNG IN EINEM ZU ANALYSIERENDEN BILD
Title (fr)
PROCEDE D'INSERTION D'UNE MARQUE NUMERIQUE DANS UNE IMAGE, ET PROCEDE CORRESPONDANT DE DETECTION D'UNE MARQUE NUMERIQUE DANS UNE IMAGE A ANALYSER
Publication
Application
Priority
- FR 1251325 A 20120213
- EP 2013052787 W 20130212
Abstract (en)
[origin: WO2013120850A1] The invention concerns a method for inserting a digital mark into an image, via an insertion device, comprising the following steps: application of a Fourier transform to said image, producing a two-dimensional Fourier spectrum; insertion of said mark into said Fourier spectrum, producing a modified Fourier spectrum; application of an inverse Fourier transform to said modified Fourier spectrum, producing a watermarked image. Said mark comprises watermark coefficients (wu,v )j each associated with a separate predetermined position (u, v) of a given quadrant from the quadrants of the Fourier domain, whereof the spectral coordinates u and v, measured along the two coordinate axes of the given quadrant and starting from the continuous component, and expressed as a percentage of dimensions U and V of the given quadrant, are such that: u > 66%xU and v > 66%xV. The set of positions associated with said watermark coefficients define a predetermined convex pattern in the given quadrant.
IPC 8 full level
G06T 1/00 (2006.01)
CPC (source: EP US)
G06T 1/0064 (2013.01 - EP US); H04N 1/3216 (2013.01 - US); H04N 1/32197 (2013.01 - US); H04N 1/3232 (2013.01 - US); H04N 1/32352 (2013.01 - US); G06T 2201/0052 (2013.01 - EP US); G06T 2201/0064 (2013.01 - US); G06T 2201/0601 (2013.01 - EP US)
Citation (search report)
See references of WO 2013120850A1
Designated contracting state (EPC)
AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
Designated extension state (EPC)
BA ME
DOCDB simple family (publication)
FR 2986890 A1 20130816; FR 2986890 B1 20140221; EP 2815378 A1 20141224; US 2015125026 A1 20150507; US 9401002 B2 20160726; WO 2013120850 A1 20130822
DOCDB simple family (application)
FR 1251325 A 20120213; EP 13703611 A 20130212; EP 2013052787 W 20130212; US 201314378502 A 20130212