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公开(公告)号：US11604247B2
公开(公告)日：2023-03-14
申请号：US16377700
申请日：2019-04-08
Applicant: Digimarc Corporation
Inventor： Brett A. Bradley , Ravi K. Sharma , Shankar Thagadur Shivappa , John D. Lord
IPC: G01S5/18
Abstract: Mobile device positioning employs various forms of audio signal structures and detection methodologies. In one method, detection of an audio signal from a first source enables construction of a signal to facilitate detection of an audio signal from another source. Signals detected from these sources enable positioning of the mobile device receiving those signals. Another method forms audio signals transmitted from audio sources so that they have parts that add constructively and parts that differentiate the sources to enable positioning. Another audio signal based positioning method adaptively switches among positioning methods so that positioning remains operative as a mobile device moves toward and away from the sources. Another method tracks positioning history, evaluates it for errors and performs error mitigation to improve accuracy. Various other positioning technologies are detailed as well.
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公开(公告)号：US11599744B2
公开(公告)日：2023-03-07
申请号：US16880778
申请日：2020-05-21
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , Tomas Filler , Utkarsh Deshmukh , William Y. Conwell
IPC: G06K9/62 , G06Q30/0601 , G06V10/82 , G06N3/04 , G06N3/08
Abstract: Aspects of the detailed technologies concern training and use of neural networks for fine-grained classification of large numbers of items, e.g., as may be encountered in a supermarket. Mitigating false positive errors is an exemplary area of emphasis. Novel network topologies are also detailed—some employing recognition technologies in addition to neural networks. A great number of other features and arrangements are also detailed.
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公开(公告)号：US20220180466A1
公开(公告)日：2022-06-09
申请号：US17479910
申请日：2021-09-20
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , John D. Lord , Robert G. Lyons , Osama M. Alattar , Jacob L. Boles
Abstract: Signal processing devices and methods estimate a geometric transform of an image signal. From a seed set of transform candidates, a direct least squares method applies a seed transform candidate to a reference signal and then measures correlation between the transformed reference signal and an image signal in which the reference signal is encoded. Geometric transform candidates encompass differential scale and shear, which are useful in approximating a perspective transform. For each candidate, update coordinates of reference signal features are identified in the image signal and provided as input to a least squares method to compute an update to the transform candidate. The method iterates so long as the update of the transform provides a better correlation. At the end of the process, the method identifies a geometric transform or set of top transforms based on a further analysis of correlation, as well as other results. Phase characteristics are exploited in the process of updating coordinates and measuring correlation. The geometric transform is used as an approximation of the geometric distortion of an image after digital data is encoded in it, and is used to compensate for this distortion to facilitate extracting embedded digital messages from the image. Due to the errors in the approximation, a signal confidence metric is determined and used to weight message symbol estimates extracted from the image.
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公开(公告)号：US20220027590A1
公开(公告)日：2022-01-27
申请号：US17393227
申请日：2021-08-03
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , Tomas Filler , Vojtech Holub , Osama M. Alattar , Hugh L. Brunk , John D. Lord , Matthew M. Weaver , William Y. Conwell
Abstract: A plastic item, such as a beverage bottle, conveys two distinct digital watermarks, encoded using two distinct signaling protocols. A first, printed label watermark conveys a retailing payload, including a Global Trade Item Number (GTIN) used by a point-of-sale scanner in a retail store to identify and price the item when presented for checkout. A second, plastic texture watermark conveys a recycling payload, including data identifying the composition of the plastic. The use of two different signaling protocols assures that a point-of-sale scanner will not spend its limited time and computational resources working to decode the recycling watermark, which lacks the data needed for retail checkout. In some embodiments, a recycling apparatus makes advantageous use of both types of watermarks to identify the plastic composition of the item (e.g., relating GTIN to plastic type using an associated database), thereby increasing the fraction of items that are correctly identified for sorting and recycling. A great number of other features and arrangements are also detailed.
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公开(公告)号：US11127105B2
公开(公告)日：2021-09-21
申请号：US15967214
申请日：2018-04-30
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , John D. Lord , Robert G. Lyons , Osama M. Alattar , Jacob L. Boles
Abstract: Signal processing devices and methods obtain an estimate of a geometric transform of an image signal, use it to obtain a measure of signal confidence of a reference signal in a sub-block of the image signal, and weight message estimates based on the signal confidence. The geometric transform is used as an approximation of the geometric distortion of an image after digital data is encoded in it, and it is used to compensate for this distortion to facilitate extracting embedded digital messages from the image. Due to the errors in the approximation, the signal confidence metric is determined and used to weight message symbol estimates extracted from the image.
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Patent Agency Ranking
公开(公告)号：US20210233204A1
公开(公告)日：2021-07-29
申请号：US17150937
申请日：2021-01-15
Applicant: Digimarc Corporation
Inventor： Adnan M. Alattar , Ravi K. Sharma , John A. Scriven
Abstract: Watermarking media content, in combination with blockchain and distributed storage networks, prevents the proliferation of Deepfake content. Digital watermarks are embedded in the audio and video tracks of video clips of trusted content producers at the time the videos are captured or before they are distributed. The watermarks are detected at the social media network's portals, nodes, and back ends. The embedded watermark imparts a unique identifier to the video, that links it to a blockchain. The watermarks also allow video source tracking, integrity verification, and alteration localization. The watermark detectors can be standalone software applications, or they can be integrated with other applications. They are used to perform three main tasks: (1) they alert the Internet user when he watches an inauthentic news video, so that he may discard it, (2) they prevent a Deepfake content from propagating through the network (3) they perform forensic analysis to help track and remove Deepfake content postings.
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公开(公告)号：US10896307B2
公开(公告)日：2021-01-19
申请号：US16002989
申请日：2018-06-07
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , Tomas Denemark , Brett A. Bradley , Geoffrey B. Rhoads , John F. Stach , Joel R. Meyer
Abstract: The parameters of an optical code are optimized to achieve improved signal robustness, reliability, capacity and/or visual quality. An optimization program can determine spatial density, dot distance, dot size and signal component priority to optimize robustness. An optical code generator employs these parameters to produce an optical code at the desired spatial density and robustness. The optical code is merged into a host image, such as imagery, text and graphics of a package or label, or it may be printed by itself, e.g., on an otherwise blank label or carton. A great number of other features and arrangements are also detailed.
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8.发明授权公开(公告)号：US10664946B2
公开(公告)日：2020-05-26
申请号：US15595662
申请日：2017-05-15
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , John D. Lord
Abstract: A phase deviation method determines an offset between a reference and suspect signal by analyzing a phase deviation surface created by computing a deviation metric for phase shift and then analyzing a surface formed from the deviation metrics for an array of offsets. The phase deviation method analyzes the deviation surface to determine an offset that minimizes phase deviation. This method is applied at increasing levels of detail to refine the determination of the offset.
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公开(公告)号：US10546590B2
公开(公告)日：2020-01-28
申请号：US15848339
申请日：2017-12-20
Applicant: Digimarc Corporation
Inventor： Ravi K. Sharma , Brett A. Bradley , Yang Bai , Shankar Thagadur Shivappa , Aparna Gurijala
IPC: G10L19/00 , G10L19/018 , G10L19/02
Abstract: Audio signal processing enhances audio watermark embedding and detecting processes. Audio signal processes include audio classification and adapting watermark embedding and detecting based on classification. Advances in audio watermark design include adaptive watermark signal structure data protocols, perceptual models, and insertion methods. Perceptual and robustness evaluation is integrated into audio watermark embedding to optimize audio quality relative the original signal, and to optimize robustness or data capacity. These methods are applied to audio segments in audio embedder and detector configurations to support real time operation. Feature extraction and matching are also used to adapt audio watermark embedding and detecting.
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公开(公告)号：US10543711B2
公开(公告)日：2020-01-28
申请号：US15650447
申请日：2017-07-14
Applicant: Digimarc Corporation
Inventor： Tony F. Rodriguez , Geoffrey B. Rhoads , Ravi K. Sharma
IPC: B42D25/333 , B42D25/23 , B42D25/00 , B42D25/328 , B41M3/10 , G07D7/12 , G07D7/20 , G07D7/005 , G06K9/46 , G06K9/22 , G06T1/00
Abstract: The application discloses apparatus and systems for authenticating physical object, identification documents and security documents. Some such methods and apparatus involve signal encoding or digital watermarking.
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