公开(公告)号：WO2005091547A2

公开(公告)日：2005-09-29

申请号：PCT/US2005/009072

申请日：2005-03-18

Applicant: DIGIMARC CORPORATION ,  SHARMA, Ravi, K. ,  RAMOS, Daniel, O. ,  RODRIGUEZ, Tony, F. ,  LEVY, Kenneth, L.

Inventor： SHARMA, Ravi, K. ,  RAMOS, Daniel, O. ,  RODRIGUEZ, Tony, F. ,  LEVY, Kenneth, L.

IPC: H04L9/00

CPC classification number: G06T1/0071 ,  G10L19/018 ,  H04L9/3236 ,  H04L9/3247 ,  H04L2209/34 ,  H04L2209/608 ,  H04N1/32144 ,  H04N1/32149 ,  H04N2201/3236 ,  H04N2201/3281 ,  H04N2201/3284

Abstract: The present invention provides a method of securing messages steganographically embedded in media (e.g., printed or electronic objects, audio and video). In one implementation, a message includes a first portion and a second portion. The first portion includes a first message and a first checksum, which are encrypted with a private key. The encrypted first portion is combined with the second portion. The second portion includes a second message and as second checksum. The combined encrypted first portion and the second portion form a signature. The signature is encrypted with a common or universal key, perhaps after error correction coding. The private key is uniquely associated with an entity such as a document issuing jurisdiction. In another implementation, a method appends information to a watermark message received from a remote device. In yet another implementation, a method provides standardized watermark payloads from various input data, regardless of the size of the input data. In another implementation, we encrypt one of two different cooperating watermark payloads, but the encryption and payload data structure help to authenticate both payloads. Another implementation provides a three encryption key pair system for managing messages and watermark embedding. Still another aspect of the invention is a watermark embedding process that uses encryption to whiten, randomize or spread message, instead of convention spread-spectrum modulation.

Abstract translation: 本发明提供了一种保护隐藏在媒体（例如，印刷或电子对象，音频和视频）中的信息的方法。 在一个实现中，消息包括第一部分和第二部分。 第一部分包括用私钥加密的第一消息和第一校验和。 加密的第一项与第二部分组合。 第二部分包括第二消息和第二校验和。 组合加密的第一部分和第二部分形成签名。 签名在公共密钥或通用密钥之间进行加密，也许在纠错编码之后。 私钥与诸如发布管辖区的文档等实体唯一相关联。

公开(公告)号：WO2002078234A1

公开(公告)日：2002-10-03

申请号：PCT/US2002/008844

申请日：2002-03-22

Applicant: DIGIMARC CORPORATION ,  STACH, John ,  BRUNK, Hugh, L. ,  SHARMA, Ravi, K.

Inventor： STACH, John ,  BRUNK, Hugh, L. ,  SHARMA, Ravi, K.

IPC: H04K1/00

CPC classification number: G10L21/00 ,  G06T1/0064 ,  G06T2201/0052 ,  G10L19/018 ,  H04N1/32144 ,  H04N1/32154 ,  H04N1/32352

Abstract: Certain forms of distortion make it difficult to recover hidden data embedded in an audio or image signal by quanitzation techniques. To compensate for this distortion, an embedded data reader analyzes a statistical distribution (e.g., a histogram) of feature samples (124) in an audio or image signal suspected of having hidden auxiliary data to derive an estimate of quantizers used to encode a reference signal (126). The estimated quantizers then recover the reference signal (126), and the reader uses the reference signal(126) to determine and compensate for geometric or temporal distortion, like spatial scaling and rotation of image data, and time scale and speed changes of audio data. After compensating for such distortion, the reader can then more accurately recover hidden message data using quantization techniques to extract the message. The reference signal (126) is preferably repeated in blocks of the image or audio data to enable synchronization at many points in an image or audio data stream. An adaptive embedding and reading technique is used to adaptively define the quantization bins for regions of a host media signal based on signal statistics for each of the regions.

Abstract translation: 某些形式的失真使得难以通过Quanitzation技术来恢复嵌入到音频或图像信号中的隐藏数据。 为了补偿这种失真，嵌入式数据读取器分析疑似具有隐藏辅助数据的音频或图像信号中的特征样本（124）的统计分布（例如，直方图），以导出用于对参考信号进行编码的量化器的估计 （126）。 估计的量化器然后恢复参考信号（126），并且读取器使用参考信号（126）来确定和补偿几何或时间失真，如图像数据的空间缩放和旋转以及音频数据的时间尺度和速度变化 。 在补偿这种失真之后，读者可以使用量化技术更准确地恢复隐藏的消息数据以提取消息。 参考信号（126）优选地以图像或音频数据的块重复，以实现图像或音频数据流中的许多点的同步。 基于每个区域的信号统计，使用自适应嵌入和读取技术来自适应地定义主媒体信号区域的量化仓。

公开(公告)号：WO2012116262A1

公开(公告)日：2012-08-30

申请号：PCT/US2012/026464

申请日：2012-02-24

Applicant: DIGIMARC CORPORATION ,  STACH, John ,  SHARMA, Ravi, K.

Inventor： STACH, John ,  SHARMA, Ravi, K.

IPC: G06K9/40

CPC classification number: H04N5/23222 ,  G06T1/0021 ,  H04N5/23258 ,  H04N5/23293

Abstract: Arrangements are detailed to aid a user in positioning a camera-equipped device (e.g., a smartphone) at a particular viewing position relative to an object being imaged. Other embodiments discern the device's viewing position, and then undertake image or other processing that is dependent on such viewpoint. A great number of other features and arrangements are also detailed.

Abstract translation: 详细的安排是为了帮助用户将相机配备的设备（例如，智能电话机）定位在相对于被成像对象的特定观看位置。 其他实施例分辨设备的观看位置，然后进行取决于这种观点的图像或其他处理。 还详细介绍了许多其他功能和安排。

公开(公告)号：WO2010135623A1

公开(公告)日：2010-11-25

申请号：PCT/US2010/035736

申请日：2010-05-21

Applicant: DIGIMARC CORPORATION ,  SHARMA, Ravi, K.

Inventor： SHARMA, Ravi, K.

IPC: G06F15/18

CPC classification number: G06F17/30743 ,  G06F17/30761 ,  G06F17/30781 ,  G06K9/6201 ,  G10L19/02 ,  G10L19/022 ,  G10L19/032 ,  H04H60/37 ,  H04H60/58 ,  H04H60/59 ,  H04H60/73

Abstract: Content signal recognition is based on a multi-axis filtering of the content signal. The signatures are calculated, formed into data structures and organized in a database for quick searching and matching operations used in content recognition. For content recognition, signals are sampled and transformed into signatures using the multi axis filter. The database is searched to recognize the signals as part of a content item in the database. Using the content identification, content metadata is retrieved and provided for a variety of applications. In one application, the metadata is provided in response to a content identification request.

Abstract translation: 内容信号识别基于内容信号的多轴滤波。 计算签名，形成数据结构，并组织在数据库中，用于内容识别中的快速搜索和匹配操作。 对于内容识别，使用多轴滤波器对信号进行采样并转换为签名。 搜索数据库以将信号识别为数据库中内容项的一部分。 使用内容标识，检索内容元数据并为各种应用程序提供内容元数据。 在一个应用中，响应于内容标识请求提供元数据。

公开(公告)号：WO2009046373A1

公开(公告)日：2009-04-09

申请号：PCT/US2008/078847

申请日：2008-10-03

Applicant: DIGIMARC CORPORATION ,  SAMTANI, Rajan ,  MEYER, Joel, R. ,  SHARMA, Ravi, K.

Inventor： SAMTANI, Rajan ,  MEYER, Joel, R. ,  SHARMA, Ravi, K.

IPC: H04L9/00

CPC classification number: H04N1/32149 ,  G06F21/10 ,  G06T1/0028 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0064 ,  G11B20/00086 ,  G11B20/00869 ,  G11B20/00884 ,  H04N1/32299 ,  H04N19/467 ,  H04N2201/3233 ,  H04N2201/327

Abstract: Methods for generating unique copies of content are disclosed In one embodiment the method generates a unique copy by varying the manner in which the master copy watermark is embedded in unique copies of a content item The master copy watermark is repeated within the content item and its location is varied in a unique pattern that comprises the unique copy watermark The unique copy is generated by producing a copy in which master copy watermarks are embedded in a unique pattern The variation in location of the instances of the master copy watermark can be in different domains such as a spatial domain, a time domain, a time-space domain, a transform domain, a compressed domain etc

Abstract translation: 公开了用于产生内容的唯一副本的方法在一个实施例中，该方法通过改变主复制水印嵌入在内容项的唯一副本中的方式来生成唯一的副本。在内容项目内重复主复制水印及其位置 以唯一的副本水印的独特模式变化通过产生主副本水印嵌入到唯一模式中的副本来生成唯一副本。主副本水印的实例的位置变化可以在不同的域中，例如 作为空间域，时域，时空域，变换域，压缩域等

公开(公告)号：WO2002088904A2

公开(公告)日：2002-11-07

申请号：PCT/US2002/013728

申请日：2002-05-01

Applicant: DIGIMARC CORPORATION ,  HANNIGAN, Brett, T. ,  SHARMA, Ravi, K. ,  DECKER, Stephen, K. ,  SEDER, Phillip, Andrew ,  RODRIGUEZ, Tony, F. ,  KLONSKY, Andrew

Inventor： HANNIGAN, Brett, T. ,  SHARMA, Ravi, K. ,  DECKER, Stephen, K. ,  SEDER, Phillip, Andrew ,  RODRIGUEZ, Tony, F. ,  KLONSKY, Andrew

IPC: G06F

CPC classification number: G06T1/0092 ,  G06T1/0064 ,  G06T2201/0051 ,  G06T2201/0061 ,  G06T2201/0601 ,  H04N1/00127

Abstract: The present invention relates to toys and game applications that are enhanced with digital watermarks. In one embodiment, a character card includes a unique identifier in the form of a digital watermark. The identifier is used to link to a database record, which can be updated to reflect changes in game attributes. Some such game attributes include life, character type and name, health, strength, and power levels. The data record can be updated or modified to reflect changes in attributes due to activity or events during a computer software game. The database record can be used by the computer software game to alter or enhance the game. In another embodiment, a toy interacts with toy components or cards via digital watermarks. Digital watermarks enhance games, toys and books in still other embodiments.

Abstract translation: 本发明涉及使用数字水印增强的玩具（20）和游戏应用。 在一个实施例中，字符卡包括数字水印形式的唯一标识符。 标识符用于链接到数据库记录（26），其可被更新以反映游戏属性的变化。 一些这样的游戏属性包括生命，字符类型和名称，健康，力量和功率水平。 可以更新或修改数据记录以反映由于计算机软件游戏期间的活动或事件而导致的属性变化。 计算机软件游戏可以使用数据库记录来改变或增强游戏。 在另一个实施例中，玩具通过数字水印与玩具组件或卡相互作用。 在其他实施例中，数字水印增强游戏，玩具和书籍。

公开(公告)号：WO2012031152A1

公开(公告)日：2012-03-08

申请号：PCT/US2011/050250

申请日：2011-09-01

Applicant: DIGIMARC CORPORATION ,  SHARMA, Ravi, K. ,  LORD, John, Douglas ,  LYONS, Robert, G.

Inventor： SHARMA, Ravi, K. ,  LORD, John, Douglas ,  LYONS, Robert, G.

IPC: H03M7/00

CPC classification number: G06T1/0064 ,  G06F1/02 ,  G06K9/6206 ,  G06T1/0021 ,  G06T3/0006 ,  G06T3/0056

Abstract: Signal processing devices and methods estimate transforms between signals using a least squares technique. A direct least squares method applies a seed transform candidate to a reference signal and then measures correlation between the transformed reference signal and a suspect signal. For each candidate, update coordinates of reference signal features are identified in the suspect signal and provided as input to a least squares method to compute an update to the transform candidate. At the end of the process, the method identifies a transform or set of top transforms based on a further analysis of correlation. A phase estimation method estimates the phase of reference signal components in a suspect signal using a point spread function. A phase deviation method determines translation between a reference and suspect signal by analyzing a phase deviation surface created by computing a deviation metric for phase shift estimates.

Abstract translation: 信号处理装置和方法使用最小二乘法估计信号之间的变换。 直接最小二乘法将种子变换候选应用于参考信号，然后测量变换的参考信号与可疑信号之间的相关性。 对于每个候选者，参考信号特征的更新坐标在可疑信号中被识别，并作为输入提供给最小二乘法以计算变换候选的更新。 在该过程结束时，该方法基于进一步的相关分析来识别变换或顶点变换集合。 相位估计方法使用点扩散函数来估计可疑信号中的参考信号分量的相位。 相位偏差法通过分析通过计算相移估计的偏差度量而产生的相位偏差表面来确定参考信号和可疑信号之间的转换。

公开(公告)号：WO2010135455A1

公开(公告)日：2010-11-25

申请号：PCT/US2010/035449

申请日：2010-05-19

Applicant: DIGIMARC CORPORATION ,  SHARMA, Ravi, K.

Inventor： SHARMA, Ravi, K.

IPC: G06K9/00

CPC classification number: G06K9/4642 ,  G06F17/30256 ,  G06K9/38 ,  G06K9/4652 ,  G06K9/6201 ,  G06K9/6212 ,  G06T7/11 ,  H04M2250/52

Abstract: A multidimensional histogram is used to characterize an image (or object), and is used to identify candidate matches with one or more reference images (or objects). An exemplary implementation employs hue information for two of the dimensions, and a second derivative function based on luminance for a third dimension. The simplicity and speed of the detailed arrangements make them well suited for use with cell phones and other mobile devices, which can use the technology for image/object recognition, e.g., in visual search applications.

Abstract translation: 多维直方图用于表征图像（或对象），并用于识别与一个或多个参考图像（或对象）的候选匹配。 示例性实施方案使用两个维度的色调信息，以及基于第三维度的亮度的二阶导数函数。 详细布置的简单性和速度使得它们非常适用于可以使用用于图像/对象识别的技术的手机和其他移动设备，例如在视觉搜索应用中。

公开(公告)号：WO2004051917A1

公开(公告)日：2004-06-17

申请号：PCT/US2003/037802

申请日：2003-11-26

Applicant: DIGIMARC CORPORATION ,  RODRIGUEZ, Tony, F. ,  REED, Alastair, M. ,  SHARMA, Ravi, K. ,  ALATTAR, Osama, M. ,  HANNIGAN, Brett, T. ,  LEVY, Kenneth, L. ,  BRUNK, Hugh, L.

Inventor： RODRIGUEZ, Tony, F. ,  REED, Alastair, M. ,  SHARMA, Ravi, K. ,  ALATTAR, Osama, M. ,  HANNIGAN, Brett, T. ,  LEVY, Kenneth, L. ,  BRUNK, Hugh, L.

IPC: H04L9/00

CPC classification number: H04N1/00846 ,  H04N1/00002 ,  H04N1/00005 ,  H04N1/00037

Abstract: This disclosure describes methods for using embedded auxiliary signals in documents for copy detection and other applications. In an application, the auxiliary signal is formed as an array of elements selected from a set of print structures (106) with properties that change differently in response to copy operations. These changes in properties of the print structures that carry the embedded auxiliary signal are automatically detectable. The extent to which the auxiliary data is detected forms a detection metric used in combination with one or more other metrics to differentiate copies from originals. Robust and fragile watermarks are used in Image Replacement Documents for a variety of applications. Digital watermarks act as on-board mediators in authentication of a variety of printed documents. Finally, digital watermarks are used to help manage quality of the scanners used in imaging systems.

Abstract translation: 本公开描述了在用于复制检测和其他应用的文档中使用嵌入式辅助信号的方法。 在应用中，辅助信号被形成为从一组打印结构（106）中选择的元素的阵列，其具有响应于复制操作而改变的属性。 携带嵌入式辅助信号的打印结构的这些属性变化可以自动检测。 检测辅助数据的程度形成与一个或多个其他度量结合使用的检测度量，以区分副本与原件。 图像替换文档中使用了强大而脆弱的水印，用于各种应用。 数字水印作为各种印刷文件认证中的板载介质。 最后，数字水印用于帮助管理成像系统中使用的扫描仪的质量。

公开(公告)号：WO2014169238A1

公开(公告)日：2014-10-16

申请号：PCT/US2014/033849

申请日：2014-04-11

Applicant: DIGIMARC CORPORATION

Inventor： RHOADS, Geoffrey, B. ,  BAI, Yang ,  RODRIGUEZ, Tony, F. ,  ROGERS, Eliot ,  SHARMA, Ravi, K. ,  LORD, John, D. ,  LONG, Scott ,  MACINTOSH, Brian, T. ,  STACH, John ,  LYONS, Robert, G. ,  EATON, Kurt, M.

IPC: G06T17/00

CPC classification number: G06K9/6215 ,  G06F17/30247 ,  G06F17/30256 ,  G06F17/30268 ,  G06K9/00 ,  G06K9/00208 ,  G06K9/4671 ,  G06K9/6202 ,  G06K9/6255 ,  G06T15/02 ,  G06T15/20 ,  G06T17/00 ,  H04N7/185

Abstract: Methods and arrangements involving portable user devices such smartphones and wearable electronic devices are disclosed, as well as other devices and sensors distributed within an ambient environment. Some arrangements enable a user to perform an object recognition process in a computationally- and time-efficient manner. Other arrangements enable users and other entities to, either individually or cooperatively, register or enroll physical objects into one or more object registries on which an object recognition process can be performed. Still other arrangements enable users and other entities to, either individually or cooperatively, associate registered or enrolled objects with one or more items of metadata. A great variety of other features and arrangements are also detailed.

Abstract translation: 公开了涉及诸如智能电话和可佩戴电子设备的便携式用户设备的方法和布置，以及分布在周围环境中的其它设备和传感器。 一些布置使得用户能够以计算和时间效率的方式执行对象识别处理。 其他布置使得用户和其他实体可以单独地或协作地将物理对象注册或注册到可以执行对象识别处理的一个或多个对象注册表中。 还有一些安排使用户和其他实体可以单独地或协同地将注册或注册的对象与一个或多个元数据项相关联。 还详细介绍了各种各样的其他功能和安排。