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    • 6. 发明授权
    • Electronic signature management system
    • 电子签名管理系统
    • US06307955B1
    • 2001-10-23
    • US09216246
    • 1998-12-18
    • Anthony E. ZankDavid R. Stevens
    • Anthony E. ZankDavid R. Stevens
    • G06K900
    • G06K9/00154
    • An electronic signature management system includes a graphic tablet digitizer for signaling position coordinates of a stylus being moved to produce a handwritten signature, a clock circuit of the digitizer defining a fixed interval between successive stylus position measurements, a computer processor electrically interfaced with the tablet and programmed for receiving and storing a multiplicity of the coordinates in sequential order as an electronic signature forming a time history of the stylus movement. The computer is also programmed for verifying the fixed time intervals of the measurements, such as by comparing a ratio of total elapsed time and total number of the measurements with a standard measurement interval, and for comparing the electronic signature with a reference signature, such as by feeding a stored reference signature counterpart and the electronic signature into a cross-correlator for evaluating a degree of correspondence between respective time histories of the electronic signature and the reference signature. The signatures can also be compared visually in a simultaneous display wherein respective pointers follow the signatures orthogonally in response to an operator-controlled slider, with pertinent data corresponding to the pointer positions being displayed. The electronic signature is preferably encrypted using a hash function or message digest of the document as a key. Also disclosed are methods for electronically signing a document, wherein the electronic signature is electronically bound to the document, wherein the electronic signature is encrypted using a key derived from the document and not saved, and methods for decrypting and verifying electronic signatures.
    • 一种电子签名管理系统,包括用于指示被移动以产生手写签名的触控笔的位置坐标的图形图形输入板数字转换器,数字转换器的时钟电路定义连续的触针位置测量之间的固定间隔,与该数位板电连接的计算机处理器, 被编程为以顺序的顺序接收和存储多个坐标作为形成触针移动的时间历史的电子签名。 计算机还被编程用于验证测量的固定时间间隔,例如通过将总经过时间和总测量次数与标准测量间隔的比率进行比较,以及用于将电子签名与参考签名进行比较,例如 通过将存储的参考签名对方和电子签名馈送到交叉相关器中,以评估电子签名的各个时间历史与参考签名之间的对应程度。 签名还可以在同时显示中进行目视比较,其中相应的指针响应于操作者控制的滑块正交地跟随签名,相应的数据对应于正在显示的指针位置。 优选地,使用文档的散列函数或消息摘要作为密钥来加密电子签名。 还公开了用于电子签名文档的方法,其中电子签名电子地绑定到文档,其中电子签名使用从文档派生而不被保存的密钥以及用于解密和验证电子签名的方法被加密。
    • 9. 发明授权
    • Video image processor and method for detecting vehicles
    • 用于检测车辆的视频图像处理器和方法
    • US5535314A
    • 1996-07-09
    • US787200
    • 1991-11-04
    • James F. AlvesGerry R. CacnioDavid R. Stevens
    • James F. AlvesGerry R. CacnioDavid R. Stevens
    • H04N7/18G06T5/00H04N11/04G06T7/40
    • G06T7/0081G06T2207/10016G06T2207/30261
    • A video image processor (100) for processing video images performing the steps of generating video images (103) with a multi-spectral video source (102), converting analog color data contained in the generated video images (103) to digital color data for subsequent signal processing, extracting the digital color data from designated areas of the generated video images and utilizing the extracted digital color data for identifying a color distinguishable from a background color. Thus, the video image processor (100) processes the generated video images and has an intrinsic immunity to the effects of shadows by exploiting multi-spectral color information to distinguish, for example, a passing vehicle from the roadway 116. In a preferred embodiment, the video image processor (100) includes a multi-spectral video source (102) for generating the video images. A color digitizer (104) is employed for converting the analog color data contained in the generated video images to the digital color data for the subsequent signal processing. Then, a digital signal processor (106) is employed to extract the digital color data from the designated areas of the generated video images. Finally, a central processing unit (108) utilizes the extracted digital color data to identify a color distinguishable from the background color.
    • 一种视频图像处理器(100),用于处理执行以多光谱视频源(102)生成视频图像(103)的步骤的视频图像,将生成的视频图像(103)中包含的模拟彩色数据转换为数字彩色数据, 随后的信号处理,从所生成的视频图像的指定区域提取数字彩色数据,并利用提取的数字颜色数据来识别与背景颜色区分开的颜色。 因此,视频图像处理器(100)处理所生成的视频图像,并且通过利用多光谱颜色信息来区分来自巷道116的经过的车辆对于阴影的影响具有固有的抗扰性。在优选实施例中, 视频图像处理器(100)包括用于产生视频图像的多光谱视频源(102)。 采用彩色数字转换器(104)将包含在所生成的视频图像中的模拟彩色数据转换成用于后续信号处理的数字彩色数据。 然后,使用数字信号处理器(106)从所生成的视频图像的指定区域提取数字彩色数据。 最后,中央处理单元(108)利用所提取的数字颜色数据来识别与背景颜色可区分的颜色。
    • 10. 发明授权
    • Devices for use with high voltage system components for the safe
expulsion of conductive moisture within such components
    • 用于高压系统组件的设备,用于安全排除这些部件内的导电水分
    • US5215475A
    • 1993-06-01
    • US907867
    • 1992-07-02
    • David R. Stevens
    • David R. Stevens
    • H01R13/52H01R13/53
    • H01R13/5227H01R13/53Y10S439/921
    • Devices for use with high voltage system components for the safe expulsion of conductive moisture within such components include elbow and T-shaped connector bodies composed of insulating elastomeric bodies covered with conductive elastomer layers. The horizontal legs include all components normally found in such components. The bore of the vertical leg provides a circuitous passage from the horizontal leg to a container or the soil for the collection of such moisture. The circuitous path prevents the moisture from leaving as a stream and the grounded metal cap at the vertical leg extremity discharges any charge carried by the moisture. The circuitous path can be provided by modules each having a curved, linear or combined path such that the total path is longer than the length of the vertical leg. A vacuum access port can provide a means to draw out the moisture if gravity is insufficient to withdraw the moisture from the high voltage system components.
    • 用于高压系统部件的用于安全排出这些部件内的导电水分的装置包括由导电弹性体层覆盖的绝缘弹性体构成的弯头和T形连接器主体。 水平腿包括通常在这些部件中发现的所有部件。 垂直腿的孔提供从水平腿到容器或土壤的迂回通道,用于收集这种水分。 迂回路径防止湿气作为流体离开,并且在垂直腿部末端处的接地金属帽排出由水分携带的任何电荷。 迂回路径可以由具有弯曲,线性或组合路径的模块提供,使得总路径长于垂直腿的长度。 如果重力不足以从高压系统部件中抽出湿气,则真空进口可提供抽出湿气的装置。