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    Efficient storage of fingerprints
    1.
    发明授权
    Efficient storage of fingerprints 有权
    有效存储指纹

    公开(公告)号：US07477739B2

    公开(公告)日：2009-01-13

    申请号：US10503245

    申请日：2003-01-21

    申请人： Jaap Andre Haitsma ,  Antonius Adrianus Cornelis Maria Kalker ,  Steven Marco Schimmel

    发明人： Jaap Andre Haitsma ,  Antonius Adrianus Cornelis Maria Kalker ,  Steven Marco Schimmel

    IPC分类号： H04L9/00

    CPC分类号： G06F17/30758 ,  G06F17/3002 ,  G06F17/30026 ,  G06F17/30743

    摘要： A robust fingerprinting system is disclosed. Such a system can recognize unknown multimedia content (U(t)) by extracting a fingerprint (a series of hash words) from said content, and searching a resembling fingerprint in a database in which fingerprints of a plurality of known contents (K(t)) are stored. In order to more efficiently store the fingerprints in the database and to speed up the search, the hash words (H(n)) of known signals (K(t)) are sub-sampled (13) by a factor M prior to storage in the database (14). The hash words (H(n)) of unknown signals (U(t)) are divided (16) into M interleaved sub-series (H0(n) . . . HM−1(n)). The interleaved sub-series are selectively (17) applied to the database (14) under the control of a computer (15). If only one of the sub-series sufficiently matches a stored fingerprint, the signal is identified.

    摘要翻译： 公开了一种健壮的指纹系统。 这样的系统可以通过从所述内容提取指纹（一系列散列字）来识别未知的多媒体内容（U（t）），并且在数据库中搜索类似的指纹，其中多个已知内容的指纹（K（t ））。 为了更有效地将指纹存储在数据库中并加速搜索，已知信号（K（t））的散列字（H（n））在存储之前以因子M被子采样（13） 在数据库（14）中。 将未知信号（U（t））的散列字（H（n））（16）分割成M个交错子序列（H0（n）... HM-1（n））。 在计算机（15）的控制下，交替子系列被选择性地（17）应用于数据库（14）。 如果子系列中只有一个与存储的指纹充分匹配，则识别该信号。

    Fingerprint database updating method, client and server
    2.
    发明授权
    Fingerprint database updating method, client and server 有权
    指纹数据库更新方法，客户端和服务器

    公开(公告)号：US07523312B2

    公开(公告)日：2009-04-21

    申请号：US10495283

    申请日：2002-10-24

    申请人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    发明人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    IPC分类号： G06F7/00

    CPC分类号： G06F17/30017 ,  Y10S707/99932 ,  Y10S707/99933 ,  Y10S707/99942

    摘要： A method of updating a database (211) comprising a fingerprint of and an associated set of metadata for each of a number of multimedia objects, A multimedia object and a set of metadata for the multimedia object is downloaded from a file sharing client (101-105). A fingerprint is computed from the multimedia object, and the computed fingerprint and the obtained set of metadata are included in the database (211). The database (211) can be maintained by a central server (210), or be maintained in a distributed fashion by servers (404) running on the file sharing clients (101-105). The database (211) in this way accumulates plural sets of metadata associated with one particular fingerprint. When a sufficient number of sets has been collected, a definite set can be determined using filtering techniques.

    摘要翻译： 一种更新数据库（211）的方法，其包括多个多媒体对象中的每一个的指纹和相关的一组元数据，多媒体对象和多媒体对象的一组元数据从文件共享客户机（101- 105）。 从多媒体对象计算指纹，计算出的指纹和获得的元数据集合包括在数据库（211）中。 可以由中央服务器（210）维护数据库（211），或者通过在文件共享客户端（101-105）上运行的服务器（404）以分布式方式维护数据库。 数据库（211）以这种方式累积与一个特定指纹相关联的多组元数据。 当已经收集了足够数量的集合时，可以使用过滤技术来确定确定集合。

    Method and arrangement for embedding a watermark in an information signal
    3.
    发明授权
    Method and arrangement for embedding a watermark in an information signal 失效
    在信息信号中嵌入水印的方法和装置

    公开(公告)号：US06707930B2

    公开(公告)日：2004-03-16

    申请号：US10003064

    申请日：2001-11-02

    申请人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    发明人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    IPC分类号： H04K100

    CPC分类号： G06T1/0028 ,  G06T2201/0081 ,  G06T2201/0202

    摘要： The invention relates to a method of embedding a watermark W in an information signal P, to a corresponding arrangement for embedding a watermark W in an information signal P, to an information signal with an embedded watermark, and to a storage medium 50 having stored thereon an information signal P with an embedded watermark W. The watermark is embedded in the information signal by deriving sub-patterns Wi from said watermark pattern W, wherein the energy spectrum concentration of each sub-pattern Wi has a dominent orientation. The local weight factors &lgr;(P) for said watermark sub-patterns Wi are determined based on the local energy spectrum of the information signal P in said dominent orientation. Said watermark sub-patterns Wi are locally weighted using said determined local weight factors &lgr;(P). Finally, the locally weighted watermark sub-patterns (Wi) are added to the information signal P.

    摘要翻译： 本发明涉及将信息信号P中的水印W嵌入信息信号P中嵌入水印W的对应装置的方法，以及存储在其上的存储介质50 具有嵌入水印W的信息信号P.通过从所述水印图案W导出子图案Wi，将水印嵌入在信息信号中，其中每个子图案Wi的能谱浓度具有主导取向。 基于所述主导方向上的信息信号P的局部能量谱，确定所述水印子模式Wi的局部加权因子λ（P）。 使用所述确定的局部加权因子λ（P）对所述水印子模式Wi进行局部加权。 最后，将局部加权水印子模式（Wi）加到信息信号P。

    Embedding and detection of watermark in a motion image signal
    4.
    发明授权
    Embedding and detection of watermark in a motion image signal 有权
    在运动图像信号中嵌入和检测水印

    公开(公告)号：US07996678B2

    公开(公告)日：2011-08-09

    申请号：US10480339

    申请日：2002-06-18

    申请人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    发明人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    IPC分类号： H04L9/00

    CPC分类号： G06T1/0085 ,  G06T1/0064 ,  G06T2201/0051 ,  H04N19/467

    摘要： A video watermarking scheme is disclosed, which is designed for the digital cinema format, as it will be used on large projector screens in theaters. The watermark is designed in such a way that it has minimal impact on the video quality, but is still detectable after capture with a handheld camera and conversion to, for instance, VHS, CD-Video or DVD format. The proposed watermarking system only exploits the temporal axis. This makes it invulnerable to geometrical distortions generally caused by such a way of capturing. The watermark is embedded by modulating a global property of the frames (e.g. the mean luminance) in accordance with the samples of the watermark. The embedding depth is preferably locally adapted within each frame to local statistics of the respective image. Watermark detection is performed by correlating the watermark sequence with extracted mean luminance values of a sequence of frames.

    摘要翻译： 公开了一种视频水印方案，其被设计用于数字电影格式，因为它将被用于剧院的大型投影仪屏幕上。 水印的设计方式使其对视频质量的影响最小，但在使用手持相机拍摄并转换为例如VHS，CD-Video或DVD格式后，仍然可以检测到水印。 所提出的水印系统仅利用时间轴。 这使得它几何失真通常是由这种捕获方式造成的。 通过根据水印的样本调制帧的全局属性（例如平均亮度）来嵌入水印。 嵌入深度优选地在每个帧内局部地适应于相应图像的局部统计。 通过将水印序列与帧序列的提取的平均亮度值相关联来执行水印检测。

    Detection of auxiliary data in an information signal
    6.
    发明授权
    Detection of auxiliary data in an information signal 有权
    检测信息信号中的辅助数据

    公开(公告)号：US06714658B2

    公开(公告)日：2004-03-30

    申请号：US10409436

    申请日：2003-04-08

    申请人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    发明人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    IPC分类号： H04K100

    CPC分类号： G06T1/0071 ,  G06T1/005 ,  G06T2201/0065

    摘要： Data is hidden in an information signal by encoding payload in to relative positions and/or polarities of multiple (possibly equal) embedded watermarks. The payload is retrieved by computing the correlation between the watermark(s) and the signal as a function of the position. The distance between peaks of the correlation function represents the payload. In order to precisely detect said distance, even if the peaks are smeared, the correlation function in a window (w1) around one peak (p1) is compared with the correlation function in a similar window (w2) around another peak (p2). This is done for different positions of said windows. The distance (k) between the windows (37,38) for which the correlation functions most resemble each other is the distance representing the payload.

    摘要翻译： 通过将有效载荷编码到多个（可能相等）嵌入水印的相对位置和/或极性，将数据隐藏在信息信号中。 通过计算水印和信号之间的相关性作为位置的函数来检索有效载荷。 相关函数的峰值之间的距离表示有效载荷。 为了精确地检测所述距离，即使灰度被抹去，在一个峰值（p1）周围的窗口（w1）中的相关函数与围绕另一个峰值（p2）的类似窗口（w2）中的相关函数进行比较。 这是对所述窗口的不同位置完成的。 相关函数最相似的窗口（37,38）之间的距离（k）是表示有效载荷的距离。

    Embedding and detection of watermark in a motion image signal
    8.
    发明授权
    Embedding and detection of watermark in a motion image signal 有权
    在运动图像信号中嵌入和检测水印

    公开(公告)号：US08452971B2

    公开(公告)日：2013-05-28

    申请号：US13188813

    申请日：2011-07-22

    申请人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    发明人： Antonius Adrianus Cornelis Maria Kalker ,  Jaap Andre Haitsma

    IPC分类号： H04L9/32

    CPC分类号： G06T1/0085 ,  G06T1/0064 ,  G06T2201/0051 ,  H04N19/467

    摘要： A video watermarking scheme is disclosed, which is designed for the digital cinema format, as it will be used on large projector screens in theaters. The watermark is designed in such a way that it has minimal impact on the video quality, but is still detectable after capture with a handheld camera and conversion to, for instance, VHS, CD-Video or DVD format. The proposed watermarking system only exploits the temporal axis. This makes it invulnerable to geometrical distortions generally caused by such a way of capturing. The watermark is embedded by modulating a global property of the frames (e.g. the mean luminance) in accordance with the samples of the watermark. The embedding depth is preferably locally adapted within each frame to local statistics of the respective image. Watermark detection is performed by correlating the watermark sequence with extracted mean luminance values of a sequence of frames.

    摘要翻译： 公开了一种视频水印方案，其被设计用于数字电影格式，因为它将被用于剧院的大型投影仪屏幕上。 水印的设计方式使其对视频质量的影响最小，但在使用手持相机拍摄并转换为例如VHS，CD-Video或DVD格式后，仍然可以检测到水印。 所提出的水印系统仅利用时间轴。 这使得它几何失真通常是由这种捕获方式造成的。 通过根据水印的样本调制帧的全局属性（例如平均亮度）来嵌入水印。 嵌入深度优选地在每个帧内局部地适应于相应图像的局部统计。 通过将水印序列与帧序列的提取的平均亮度值相关联来执行水印检测。