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    System and method for authentication of JPEG image data
    93.
    发明申请
    System and method for authentication of JPEG image data 有权

    公开(公告)号：US20040015697A1

    公开(公告)日：2004-01-22

    申请号：US10200925

    申请日：2002-07-22

    Applicant: Xerox Corporation

    Inventor： Ricardo L. de Queiroz

    IPC: H04L009/00

    CPC classification number: G06T1/0042 ,  G06T2201/0052 ,  H04N1/32144 ,  H04N1/3217 ,  H04N1/32187 ,  H04N1/32277 ,  H04N1/32304 ,  H04N2201/3236 ,  H04N2201/3239 ,  H04N2201/327

    Abstract: What has been disclosed is a system and method for authentication of JPEG image data prior to transmission to an intended recipient which enables the recipient to ascertain whether the received image file originated from a known identified source or whether the contents of the file have been altered in some fashion prior to receipt. In accordance to the present invention, to encode verification information a unique hashing function is derived from a first section of image data contained in the JPEG compressed image in such a way that any changes subsequently made to said first section of image data would be reflected in a different hashing function being derived therefrom. An integrity checking number is produced from the first section's derived hashing function. The integrity checking number is subsequently encrypted into a signature string. The signature string is then embedded into a next section of the image data. The process is repeated until all sections of image data have been processed. The signature string corresponding to the very last section of data is self-embedded therein. As the embedding of a previous section's integrity checking number is done without modifying the JPEG bit stream any JPEG decoder found in the arts can thereafter properly decode the image. The image file is then transmitted to an intended recipient. To decode the embedded verification information upon receipt of the JPEG image file by the recipient a hashing function is computed by the recipient from a first section of image data contained in the received image file. A second section of data is identified wherein the signature string for the first section of data had been embedded. The signature is then decoded from the data. The signature string is thereafter decrypted to yield the hashing function (integrity checking) number contained therein. The two numbers are then compared against each other. If the first checking number matches the number contained in retrieved signature string which had been previously embedded therein by the author then it can be ascertained that the image data for that first section is authentic. The process is repeated for each successive section of data until all the data sections of the image file have been processed.

    Embedding, processing and detection of digital content, information and data
    97.
    发明申请
    Embedding, processing and detection of digital content, information and data 有权
    嵌入，处理和检测数字内容，信息和数据

    公开(公告)号：US20020095577A1

    公开(公告)日：2002-07-18

    申请号：US09946408

    申请日：2001-09-05

    Applicant: International Business Machines Corporation

    Inventor： Taiga Nakamura ,  Ryuki Tachibana ,  Shuichi Shimizu ,  Seiji Kobayashi

    IPC: H04L009/00

    CPC classification number: G06T1/0071 ,  G06T2201/0065 ,  H04N1/00005 ,  H04N1/00037 ,  H04N1/00045 ,  H04N1/32144 ,  H04N1/32304 ,  H04N2201/3239

    Abstract: Enables identification and detection of processing and type of digital content, while using multiple electronic watermarks. One embodiment provides a data processing detection system having an embedding apparatus for adding a predetermined additional signal to digital content, including a watermark design unit and embedding signal generators for generating multiple types of additional signals, correlated with each other and of differing robustness from each other for the processing of the content data, and a synthesis unit for adding the multiple types of additional signals to the content data; and detection apparatus for detecting additional signals in the digital content, and for detecting the additional signals embedded by the embedding apparatus, including an individual detector for detecting in the content data multiple additional signals, and a determination unit for examining deterioration levels of the additional signals to determine the type of processing performed for the content data.

    Abstract translation: 在使用多个电子水印的同时，可以识别和检测数字内容的处理和类型。 一个实施例提供了一种数据处理检测系统，其具有用于向数字内容添加预定附加信号的嵌入装置，包括水印设计单元和嵌入信号发生器，用于生成彼此相关的多种类型的附加信号，并且彼此之间具有不同的鲁棒性 用于处理内容数据;以及合成单元，用于将多种类型的附加信号添加到内容数据; 以及检测装置，用于检测数字内容中的附加信号，并且用于检测嵌入装置嵌入的附加信号，包括用于在内容数据中检测多个附加信号的单独检测器，以及用于检查附加信号的劣化水平的确定单元 以确定对内容数据执行的处理的类型。

    Watermarking technique for scaled image
    98.
    发明申请
    Watermarking technique for scaled image 有权
    水印技术用于缩放图像

    公开(公告)号：US20020062442A1

    公开(公告)日：2002-05-23

    申请号：US09990559

    申请日：2001-11-21

    Applicant: NEC Corporation

    Inventor： Shigeyuki Kurahashi

    IPC: H04L009/00

    CPC classification number: G06T1/0064 ,  G06T2201/0064 ,  H04N1/32149 ,  H04N1/32267 ,  H04N1/32304 ,  H04N2201/3239 ,  H04N2201/327

    Abstract: A watermarking system allowing an appended-type watermark to be easily inserted into a scaled-up/down image without deteriorating the detection accuracy of the appended-type watermark is disclosed. A first scaling factor of an input watermarked image is detected by detecting a copy control watermark from the input watermarked image. It is determined whether a watermark including a second scaling factor is detected from the input watermarked image. When the watermark including the second scaling factor fails to be detected, a second watermark including the first scaling factor is created and embedded into the input watermarked image and further an appended-type watermark is inserted into the input watermarked image. When the watermark including the second scaling factor is detected, the first and second scaling factors are used to calculate a third scaling factor, which is used to detect the appended-type watermark.

    Abstract translation: 公开了一种水印系统，其允许将附加类型的水印容易地插入到放大/缩小图像中，而不会降低附加类型水印的检测精度。 通过从输入的水印图像检测复制控制水印来检测输入水印图像的第一缩放因子。 确定是否从输入的水印图像中检测到包括第二缩放因子的水印。 当包含第二缩放因子的水印不能检测到时，产生包含第一缩放因子的第二水印并将其嵌入到输入的加水印图像中，并且另外将附加类型的水印插入到输入的水印图像中。 当检测到包括第二比例因子的水印时，第一和第二缩放因子用于计算用于检测附加类型水印的第三缩放因子。

    Authentication watermarks for printed objects and related applications
    99.
    发明申请
    Authentication watermarks for printed objects and related applications 有权
    用于打印对象和相关应用程序的认证水印

    公开(公告)号：US20020012445A1

    公开(公告)日：2002-01-31

    申请号：US09775934

    申请日：2001-02-02

    Inventor： Burt W. Perry

    IPC: G06K009/00

    CPC classification number: H04N21/8358 ,  G06F21/10 ,  G06F21/6209 ,  G06F21/71 ,  G06F21/78 ,  G06F21/79 ,  G06F21/80 ,  G06F2221/2135 ,  G06Q10/00 ,  G06T1/0021 ,  G06T1/0042 ,  G06T1/0071 ,  G06T2201/0064 ,  G07D7/0034 ,  H04N1/32144 ,  H04N1/32283 ,  H04N1/32288 ,  H04N1/32331 ,  H04N21/2347 ,  H04N21/2351 ,  H04N21/26613 ,  H04N21/4117 ,  H04N21/4223 ,  H04N21/4408 ,  H04N21/8352 ,  H04N2201/3205 ,  H04N2201/3235 ,  H04N2201/3236 ,  H04N2201/3238 ,  H04N2201/3239 ,  H04N2201/3269 ,  H04N2201/327 ,  H04N2201/3271 ,  H04N2201/3281

    Abstract: The disclosure describes systems for creating and authenticating printed objects using authentication and copy detection watermarks. For example, one verification system includes a watermark decoder and a verification module. The watermark decoder detects a copy detection watermark in a printed object to determine whether the printed object has been reproduced. The verification module processes a message decoded from an authentication watermark on the printed object to authenticate the printed object or bearer of the printed object. The authentication and copy detection watermarks may be implemented as the same or different watermarks. For example, the copy detection watermark may be a fragile watermark that carries the message and that degrades in response to a reproduction operation, such as photocopying or scanning and then reprinting the object. Alternatively, the authentication and copy detection watermarks may be separate watermarks embedded in an image that is printed on the object. The authentication watermark, in some applications, includes an identifier that links the object to a database entry with related information about the object. This related information can be used to check the bearer of the object by comparing it with attributes of the bearer (such as a user ID or photo) or the validity of the object by comparing it with attributes that are visible or machine readable on the object.

    Abstract translation: 本公开描述了使用认证和复制检测水印来创建和认证打印对象的系统。 例如，一个验证系统包括水印解码器和验证模块。 水印解码器检测打印对象中的拷贝检测水印，以确定打印对象是否被再现。 验证模块处理从打印对象上的认证水印解码的消息，以验证打印对象或打印对象的承载。 认证和复制检测水印可以被实现为相同或不同的水印。 例如，复制检测水印可以是携带消息的脆弱水印，并且响应于诸如复印或扫描的再现操作而降级，然后重新打印对象。 或者，认证和复制检测水印可以是嵌入在打印在对象上的图像中的单独的水印。 在一些应用中，认证水印包括将对象链接到具有关于对象的相关信息的数据库条目的标识符。 该相关信息可以用于通过将对象与对象的属性（例如用户ID或照片）进行比较或对象的有效性与对象的可见或机器可读性的属性进行比较来检查对象的承载 。

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