Source: http://www.google.com/patents/US6714683?dq=5,960,411
Timestamp: 2014-03-13 15:09:32
Document Index: 746979744

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

Patent US6714683 - Wavelet based feature modulation watermarks and related applications - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign inAdvanced Patent SearchPatentsA watermark embedder decomposes a media signal from its perceptual domain to subbands and embeds a message signal in the edge information of neighboring coefficients of those subbands. A compatible watermark decoder decomposes the watermarked signal into subbands and demodulates the message signal from...http://www.google.com/patents/US6714683?utm_source=gb-gplus-sharePatent US6714683 - Wavelet based feature modulation watermarks and related applicationsAdvanced Patent SearchPublication numberUS6714683 B1Publication typeGrantApplication numberUS 09/645,779Publication dateMar 30, 2004Filing dateAug 24, 2000Priority dateAug 24, 2000Fee statusPaidAlso published asUS6683966Publication number09645779, 645779, US 6714683 B1, US 6714683B1, US-B1-6714683, US6714683 B1, US6714683B1InventorsJun Tian, Stephen K. DeckerOriginal AssigneeDigimarc CorporationExport CitationBiBTeX, EndNote, RefManPatent Citations (32), Non-Patent Citations (51), Referenced by (47), Classifications (21), Legal Events (7) External Links: USPTO, USPTO Assignment, EspacenetWavelet based feature modulation watermarks and related applicationsUS 6714683 B1Abstract A watermark embedder decomposes a media signal from its perceptual domain to subbands and embeds a message signal in the edge information of neighboring coefficients of those subbands. A compatible watermark decoder decomposes the watermarked signal into subbands and demodulates the message signal from the edge information of neighboring coefficients. In addition to the message signal, the embedder may also encode an orientation signal to synchronize the decoder with the embedded signal in a distorted version of the watermarked signal. The watermark system may be used in a variety of applications, including robustly carrying metadata or links to metadata, and to detect alterations of the watermarked signal, such as alterations due to printing, scanning, compression, etc.
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 application Ser. No. 09/503,881, filed Feb. 14, 2000; which are hereby incorporated by reference.
In some applications, the watermarked signal may be subjected to various types of distortion, including geometric transformation. As such, it is useful to incorporate features into the watermark that enable the decoder to detect the watermark in a signal suspected of containing a watermark and to determine its orientation parameters, such as its origin (translation), rotation, scale, affine transform parameters, shear, differential scale, etc. One such feature is a watermark synchronization signal or orientation signal. One example is an orientation signal that is expressed as a collection of impulse or �delta� functions in the Fourier magnitude domain having pseudorandom phase. Various forms of correlation operations may be used to detect the orientation signal and determine its orientation parameters as disclosed in U.S. Pat. No. 5,862,260, and in application Ser. No. 09/503,881, filed Feb. 14, 2000; which is incorporated by reference. For example, a decoder may correlate a reference orientation signal with a signal suspected of containing a watermark. The amount of correlation can be used to determine whether the watermark is likely present. The resulting orientation parameters may be used to align the watermarked signal to approximate the geometric position of the signal at the time of encoding. Then, the decoder may extract the auxiliary message from the re-aligned signal data.
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