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    Signal Processors and Methods for Estimating Geometric Transformations of Images for Digital Data Extraction
    1.
    发明申请
    Signal Processors and Methods for Estimating Geometric Transformations of Images for Digital Data Extraction 有权

    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

    IPC: G06T1/00 ,  G06V10/75 ,  G06T3/00

    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.

    RECYCLING METHODS AND SYSTEMS, AND RELATED PLASTIC CONTAINERS
    2.
    发明申请
    RECYCLING METHODS AND SYSTEMS, AND RELATED PLASTIC CONTAINERS 有权

    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

    IPC: G06K7/14 ,  G06T7/00 ,  G06K9/20

    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.

    HIERARCHICAL WATERMARK DETECTOR
    5.
    发明申请
    HIERARCHICAL WATERMARK DETECTOR 审中-公开
    分层水印探测器

    公开(公告)号：US20150154724A1

    公开(公告)日：2015-06-04

    申请号：US14546708

    申请日：2014-11-18

    Applicant: Digimarc Corporation

    Inventor： Osama M. Alattar ,  Adnan M. Alattar

    IPC: G06T1/00 ,  G06K9/00

    CPC classification number: G06T1/005 ,  G06K9/00744 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0065 ,  H04N1/32203 ,  H04N1/32267 ,  H04N1/32288 ,  H04N1/32352

    Abstract: The present invention relates generally to digital watermarking. In one implementation, we provide a hierarchical digital watermark detector method. The method includes: i) in a first layer of a hierarchical search, performing watermark detection on blocks of at least a portion of an incoming suspect signal; ii) identifying a first block in the portion that is likely to include a decodable digital watermark; and iii) in a second layer of the hierarchical search, performing additional watermark detection on overlapping blocks in a neighborhood around the first block. Another implementation provides a hierarchical watermark detector including a buffer and a detector. The buffer stores portions of an incoming signal. The detector evaluates watermark detection criteria for blocks stored in the buffer, and hierarchically zooms into a neighborhood of blocks around a block associated with watermark detection criteria that satisfies detection criteria.

    Abstract translation: 本发明一般涉及数字水印。 在一个实现中，我们提供了一种分层数字水印检测器方法。 该方法包括：i）在分层搜索的第一层中，对进入的可疑信号的至少一部分的块执行水印检测; ii）识别该部分中可能包括可解码数字水印的第一块; 以及iii）在所述分层搜索的第二层中，对所述第一块周围的邻域中的重叠块执行附加水印检测。 另一实施方案提供了包括缓冲器和检测器的分层水印检测器。 缓冲器存储进入信号的部分。 检测器评估存储在缓冲器中的块的水印检测标准，并且分级地放大到与满足检测标准的水印检测标准相关联的块周围的块的邻域。

    Learning systems and methods
    8.
    发明授权
    Learning systems and methods 有权

    公开(公告)号：US11625805B2

    公开(公告)日：2023-04-11

    申请号：US17152498

    申请日：2021-01-19

    Applicant: Digimarc Corporation

    Inventor： Osama M. Alattar

    IPC: G06T1/00 ,  G06F21/16 ,  G06K9/62 ,  G06V10/24 ,  G06V20/20

    Abstract: A sequence of images depicting an object is captured, e.g., by a camera at a point-of-sale terminal in a retail store. The object is identified, such as by a barcode or watermark that is detected from one or more of the images. Once the object's identity is known, such information is used in training a classifier (e.g., a machine learning system) to recognize the object from others of the captured images, including images that may be degraded by blur, inferior lighting, etc. In another arrangement, such degraded images are processed to identify feature points useful in fingerprint-based identification of the object. Feature points extracted from such degraded imagery aid in fingerprint-based recognition of objects under real life circumstances, as contrasted with feature points extracted from pristine imagery (e.g., digital files containing label artwork for such objects). A great variety of other features and arrangements—some involving designing classifiers so as to combat classifier copying—are also detailed.

    CONCERNING DIGITAL MARKING AND READING OF PLASTIC ITEMS, USEFUL IN RECYCLING
    10.
    发明申请
    CONCERNING DIGITAL MARKING AND READING OF PLASTIC ITEMS, USEFUL IN RECYCLING 审中-公开

    公开(公告)号：US20190306385A1

    公开(公告)日：2019-10-03

    申请号：US16435292

    申请日：2019-06-07

    Applicant: Digimarc Corporation

    Inventor： Ravi K. Sharma ,  Tomas Filler ,  Vojtech Holub ,  Osama M. Alattar ,  Hugh L. Brunk ,  Matthew M. Weaver ,  William Y. Conwell

    IPC: H04N5/225 ,  G06F21/16 ,  H04N21/44 ,  G09C5/00 ,  H04N21/2389 ,  H04N21/8358

    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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