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    • 7. 发明申请
    • Decorrelation of signals
    • 信号的相关性
    • US20060020428A1
    • 2006-01-26
    • US10536709
    • 2003-11-26
    • Paul BaxterJohn McWhirter
    • Paul BaxterJohn McWhirter
    • G06F15/00
    • G06K9/624
    • A method of strongly decorrelating signals comprising processing input signals to determine delay and rotation parameters which implement at least one elementary paraunitary matrix. The parameters transform the input signals into output signals with improvement in a measure of strong decorrelation. The improvement in the measure of strong decorrelation is then assessed: if it is significant the latest output signals are, designated as input signals and the process is iterated. Iteration continues until the measure of strong decorrelation ceases to improve significantly, at which point the latest output signals are designated as signals decorrelated in a wide sense.
    • 一种强相关信号的方法,包括处理输入信号以确定延迟和旋转参数,该参数实现至少一个基本的超幺正矩阵。 这些参数将输入信号转换为输出信号,改进了强去相关的度量。 然后评估强去相关度的改进:如果有意义的话,最新的输出信号被指定为输入信号,迭代过程。 迭代继续下去,直到强大的去相关性的测量不再显着改善,此时最新的输出信号被指定为在广义上解相关的信号。
    • 8. 发明申请
    • Blind signal separation
    • 盲信号分离
    • US20050105644A1
    • 2005-05-19
    • US10504622
    • 2003-02-14
    • Paul BaxterJohn Mcwhirter
    • Paul BaxterJohn Mcwhirter
    • G10L15/20G06K9/00G06K9/62G10L21/02H03H21/00H04L27/06
    • H03H21/0012G06K9/624
    • A method of blind signal separation of convolutively mixed signals comprises firstly processing signals to produce second order independence. In a second step, and together with ranges of signal delay and rotation parameters, the resulting processed signals are used to determine delay and rotation parameters. These parameters implement at least one elementary paraunitary matrix and transform the processed signals into output signals with improvement in independence to at least a predominant part of a maximum extent obtainable over the parameter ranges. The output signals then become the next processed signals and the second step is iterated until independence ceases to be improved significantly. The latest output signals are then unmixed signals.
    • 卷积混合信号的盲信号分离方法包括首先处理信号以产生二阶独立性。 在第二步,并且与信号延迟和旋转参数的范围一起,所得到的处理信号用于确定延迟和旋转参数。 这些参数实现至少一个基本的超幺正矩阵,并且将经处理的信号转换为输出信号,并将其独立性提高至可通过参数范围获得的最大程度的至少主要部分。 然后,输出信号变为下一个处理的信号,并且第二步重复,直到独立性不再显着改善。 最新的输出信号是未混合信号。
    • 9. 发明授权
    • Secure identification documents
    • 安全身份证明文件
    • US08448991B2
    • 2013-05-28
    • US12281486
    • 2006-03-17
    • Paul BaxterWim Tappij Gielen
    • Paul BaxterWim Tappij Gielen
    • B42D15/00G09C3/00
    • B42D25/435B42D25/00B42D25/21B42D25/41B42D2035/06B42D2035/50
    • Improvements that prevent tampering of images on identification documents for example identity cards, credit cards and the like, and passports. The document includes a full color image of a person, and a second, full, achromatic image of the person formed underneath and spaced from the color image and in congruence therewith using a laser. The second full image is not visible underneath the first full image during normal viewing of the document, and is only visible upon removal of all or a portion of the first full image. As a result, the document and the image have no outwardly apparent visual difference to the document holder or to a would-be counterfeiter. This provides a covert security feature that is not known or seen until the document is attacked by removing the first full image.
    • 防止身份证,信用卡等身份证件上的图像被篡改的改进以及护照。 该文件包括人的全彩色图像和形成在彩色图像下面并与彩色图像间隔开的人的第二,全部,无色图像,并且使用激光与其一致。 在正常观看文档时,第二个完整图像在第一个完整图像的下方是不可见的,只有在删除了第一个完整图像的全部或一部分时才可见。 因此,文件和图像与文件夹或假冒伪造者没有明显的视觉差异。 这提供了一个秘密的安全功能,直到文档被删除第一个完整的图像被攻击才知道或看不到。