Source: http://www.google.com/patents/US6512837?dq=7810729
Timestamp: 2014-03-12 09:59:35
Document Index: 623487904

Matched Legal Cases: ['application No. 09', 'application No. 09', 'application No. 09', 'application No. 09', 'application No. 60', 'application No. 60', 'application No. 60']

Patent US6512837 - Watermarks carrying content dependent signal metrics for detecting and ... - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsThe invention provides methods and systems for detecting and characterizing alterations of media content, such as images, video and audio signals, using watermark messages to carry signal metrics. By comparing signal metrics extracted from the watermark to signal metrics calculated from a suspect signal,...http://www.google.com/patents/US6512837?utm_source=gb-gplus-sharePatent US6512837 - Watermarks carrying content dependent signal metrics for detecting and characterizing signal alterationAdvanced Patent SearchPublication numberUS6512837 B1Publication typeGrantApplication numberUS 09/689,250Publication dateJan 28, 2003Filing dateOct 11, 2000Priority dateOct 11, 2000Fee statusPaidAlso published asUS6771797, US20030112997, WO2002032031A1Publication number09689250, 689250, US 6512837 B1, US 6512837B1, US-B1-6512837, US6512837 B1, US6512837B1InventorsFarid AhmedOriginal AssigneeDigimarc CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (14), Non-Patent Citations (24), Referenced by (65), Classifications (25), Legal Events (8) External Links: USPTO, USPTO Assignment, EspacenetWatermarks carrying content dependent signal metrics for detecting and characterizing signal alterationUS 6512837 B1Abstract The invention provides methods and systems for detecting and characterizing alterations of media content, such as images, video and audio signals, using watermark messages to carry signal metrics. By comparing signal metrics extracted from the watermark to signal metrics calculated from a suspect signal, a watermark decoder can detect and even classify types of alterations to the watermarked signal.
RELATED APPLICATION DATA The subject matter of the present application is related to that disclosed in U.S. Pat. No. 5,862,260, and in co-pending application Ser. No. 09/234,780, filed Jan. 2, 1999, Ser. No. 09/498,223, filed Feb. 3, 2000, Ser. No. 09/503,881, filed Feb. 14, 2000; Ser. No. 60/198,138, filed Apr. 17, 2000, Ser. No. 09/574,726, filed May 18, 2000, Ser. No. 09/618,948, filed Jul. 19, 2000, Ser. No. 09/625,577, filed Jul. 25, 2000, and Ser. No. 09/645,779, filed Aug. 24, 2000, which are hereby incorporated by reference.
TECHNICAL FIELD The invention relates to multimedia signal processing, and in particular relates to hiding auxiliary information in media signals like audio, video and image signals, and using the auxiliary information to detect and characterize tampering of the signal.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows a watermark embedding process for encoding content dependent metrics into a watermark for use in detecting and characterizing content alteration.
DETAILED DESCRIPTION FIG. 1 shows a watermark embedding process for encoding content dependent metrics into a watermark for use in detecting and characterizing content alteration. To illustrate the process, consider an example application for detecting alteration of image content. In this example, a watermark embedder divides an input media signal (100) (e.g., a host image) into blocks (102). It then calculates signal metrics for each block (104). The metrics for each block form a signature (106). The embedder quantizes the metrics in the signature and encodes the resulting signature as part of a watermark message in the block using a watermark embedding process (108), such as the methods described in U.S. Pat. No. 5,862,260, and in co-pending application Ser. No. 09/503,881. An additional enhancement of the method is to encrypt each quantized signature with an encryption key. In one implementation, the embedder calculates the signature from a combination of signal metrics in different blocks, and then embeds the signature in one or more blocks using a spread spectrum embedding function.
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H04N1/32144, H04N1/00039, G06T1/0064, H04N1/32229, H04N1/32288, H04N1/00045, H04N1/00037, G06T1/0028European ClassificationH04N1/00A3F, H04N1/32C19B3E, H04N1/00A3E, H04N1/00A1, H04N1/00A3J, H04N1/32C19B6, H04N1/00A, H04N1/32C19, G06T1/00W6G, G06T1/00W2Legal EventsDateCodeEventDescriptionNov 2, 2010ASAssignmentOwner name: DIGIMARC CORPORATION, OREGONFree format text: MERGER;ASSIGNOR:DMRC CORPORATION;REEL/FRAME:025227/0832Effective date: 20080903Owner name: DMRC CORPORATION, OREGONEffective date: 20080801Free format text: MERGER;ASSIGNOR:DMRC LLC;REEL/FRAME:025227/0808Oct 29, 2010ASAssignmentFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:DIGIMARC CORPORATION (A DELAWARE CORPORATION);REEL/FRAME:025217/0508Owner name: DMRC LLC, OREGONEffective date: 20080801Sep 16, 2010ASAssignmentOwner name: DIGIMARC CORPORATION, OREGONFree format text: CORRECTIVE ASSIGNMENT TO CORRECT THE STATE OF INCORPORATION FROM OREGON TO DELAWARE PREVIOUSLY RECORDED ON REEL 011486 FRAME 0776. 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