Source: http://www.google.nl/patents/US5875249?hl=nl
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Patent US5875249 - Invisible image watermark for image verification - Google PatentenZoeken Afbeeldingen Maps Play YouTube Nieuws Gmail Drive Meer » Geavanceerd zoeken naar patenten | Webgeschiedenis | Inloggen Geavanceerd zoeken naar patenten PatentenA system quickly verifies that the content of an image has not been changed since an earlier time when the content of that image was stamped. The system consists of a stamping process that embeds stamping information into a source image and produces a verification key, and a verification process that...http://www.google.nl/patents/US5875249?utm_source=gb-gplus-sharePatent US5875249 - Invisible image watermark for image verification PublicatienummerUS5875249 APublicatietypeVerlening Aanvraagnummer08/780,484 Publicatiedatum23 feb 1999 Aanvraagdatum8 jan 1997 Prioriteitsdatum8 jan 1997Ook gepubliceerd alsEP0853294A2EP0853294A3EP0853294B1 UitvindersFrederick Cole MintzerMinerva Ming-Yee Yeung Oorspronkelijke patenteigenaarInternational Business Machines CorporationTrend Micro IncorporatedIbm Corporation Classificatie in de VS380/54713/176380/203283/17283/73380/55283/113 Internationale classificatieH04N1/44H04N7/30G06T7/00H04N1/32G09C5/00H04N7/081G06T1/00H04N1/387H04N7/08 Co�peratieve classificatieG06T1/0021H04N2201/3269H04N1/32208H04N1/32352H04N1/32229H04N1/32203H04N2201/3233 Europese classificatieH04N 1/32C19CH04N 1/32C19B3BH04N 1/32C19B3EH04N 1/32C19B3G06T 1/00WReferentiesPatentcitaties (6)Niet-patentcitaties (8) Verwijzingen naar dit patent (211)Externe linksUSPTO USPTO-toewijzing EspacenetInvisible image watermark for image verificationUS 5875249 A Samenvatting A system quickly verifies that the content of an image has not been changed since an earlier time when the content of that image was stamped. The system consists of a stamping process that embeds stamping information into a source image and produces a verification key, and a verification process that extracts stamping information from a stamped source image based on the verification key. Furthermore, the verification process produces an image itself, from which the verification can be readily judged visually or by use of a computer or other display device. In the verification process, the changes in an image can be detected and localized. The image stamping process further includes an error diffussion process so that the effects of combining the stamping information with the original image are not readily perceptable. An image is safeguarded against malicious manipulations and the proprietary rights are protected by maintaining the integrity of the image content.
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