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    • 2. 发明授权
    • Digit-serial transversal filters
    • 数字串行横向滤波器
    • US5034908A
    • 1991-07-23
    • US504503
    • 1990-04-02
    • Richard I. HartleyPeter F. CorbettFathy F. YassaSharbel E. Noujaim
    • Richard I. HartleyPeter F. CorbettFathy F. YassaSharbel E. Noujaim
    • G06F7/52H03M9/00
    • G06F7/5312H03M9/00
    • One type of transversal filter using digit-serial signals in its operation comprises a to-digit-serial converter for converting a succession of input data words received at its input port each to a respective succession of m-bit-wide digits supplied from its output port in order of progressively greater significance, m being a positive plural integer; a clocked delay line having an input tap connected for responding to the m-bit-wide digits supplied from the output port of the to-digit-serial converter and having at least one further tap for supplying a respective tap signal; and means for performing a weighted summation of the input signal to the clocked delay line and each tap signal from the clocked delay line, to generate a filter response in digit-serial format. Another type of transversal filter, which uses digit-serial signals in its operation, comprises a plurality, p in number, of parallel-to-digit-serial converters, each for generating a respective m-bit-wide digit-serial data stream by converting n-parallel-bit words in an input signal to the digital filter, m being a positive integer and n being the product of m and p; a plurality of tapped delay lines having respective input taps connected from respective ones of said parallel-to-digit-serial converters and each having at least one further tap; means for generating p different phases of filter response in digit-serial form by weighting and summing digital signals taken from respective taps on ones of the p tapped delay lines; and p digit-serial-to-parallel converters for converting, on a cyclic basis, the different phases of filter response to parallel-bit words in an output signal from the digital filter.
    • 在其操作中使用数字串行信号的一种类型的横向滤波器包括一个数字串行转换器,用于将在其输入端口处接收的一系列输入数据字转换成从其输出端提供的各个相继的m位宽数字 端口按顺序逐渐显现,m为正整数; 时钟延迟线具有连接的输入抽头,用于响应从位数字串行转换器的输出端口提供的m位宽数字,并具有用于提供相应抽头信号的至少一个另外的抽头; 以及用于对来自时钟延迟线的时钟延迟线和每个抽头信号执行输入信号的加权求和的装置,以产生数字串行格式的滤波器响应。 在其操作中使用数字串行信号的另一种类型的横向滤波器包括多个并行数字串行转换器,每个转换器用于通过以下步骤产生相应的m位宽数字串行数据流: 将输入信号中的n个并行位字转换为数字滤波器,m是正整数,n是m和p的乘积; 多个抽头延迟线,其具有从相应的所述并行到数字串行转换器连接的各个输入抽头,并且每个具有至少一个另外的抽头; 用于以数字串行形式产生滤波器响应的p个不同相位的装置,用于通过对从所述p个抽头延迟线中的一个上的各个抽头获得的数字信号进行加权和求和; 和p位串行到并行转换器,用于在来自数字滤波器的输出信号中循环地将滤波器响应的不同相位转换成并行位字。
    • 6. 发明授权
    • Epipolar reconstruction of 3D structures
    • 3D结构的对极重建
    • US5559334A
    • 1996-09-24
    • US447021
    • 1995-05-22
    • Rajiv GuptaRichard I. Hartley
    • Rajiv GuptaRichard I. Hartley
    • G01C11/02G01N23/04G01N23/02
    • G01N23/046G01C11/02G01N2223/419
    • A method of reconstructing selected features of a part manufactured according to a CAD model involves acquiring a set of linear push broom (LPB) projection images of the part acquired at different angles about an axis of rotation passing through the part. Acquiring a set of matrices M.sub.j j=1 . . . N, each of which maps 3D coordinates of the part to screen coordinates of one of the projection images. Reconstruction of 3D structures from the projection images requires identification of screen coordinates of each image which correspond to a point of the structure of the part to be reconstructed. Back projecting these screen coordinates modified by the distortion inherent in the LPB imaging device. This is accomplished by selecting a screen coordinate on a feature desired to be reconstructed. Computing a ray passing through the selected screen coordinate through an imaging center. Using each M matrix to map this ray to a hyperbola on the other images. The hyperbola is then scanned until the desired feature is encountered. This second screen location of this projection image corresponds to the first selected screen location. A second ray through the second screen coordinate is constructed. Where it intersects the first ray identifies the 3D reconstruction point. This is repeated for a number of points to create a reconstruction of the selected feature.
    • 重建根据CAD模型制造的零件的选定特征的方法包括获取围绕穿过该零件的旋转轴线以不同角度获取的部分的一组线性推扫扫(LPB)投影图像。 获取一组矩阵Mj j = 1。 。 。 N,其中的每一个将部分的3D坐标映射到一个投影图像的屏幕坐标。 从投影图像重建3D结构需要识别与要重建的部分的结构的点相对应的每个图像的屏幕坐标。 返回投影由LPB成像设备中固有的失真修改的这些屏幕坐标。 这通过在期望重建的特征上选择屏幕坐标来实现。 通过成像中心计算穿过所选屏幕坐标的光线。 使用每个M矩阵将该光线映射到其他图像上的双曲线。 然后扫描双曲线直到遇到所需的特征。 该投影图像的第二屏幕位置对应于第一选择的屏幕位置。 构建通过第二屏幕坐标的第二射线。 与第一个射线相交的位置识别3D重建点。 为了创建所选特征的重建,重复这一点。
    • 7. 发明授权
    • Method of calibration of imaging devices
    • 成像装置的校准方法
    • US5550376A
    • 1996-08-27
    • US447020
    • 1995-05-22
    • Rajiv GuptaJulia A. NobleRichard I. HartleyAndrea M. Schmitz
    • Rajiv GuptaJulia A. NobleRichard I. HartleyAndrea M. Schmitz
    • G01N23/04G01N23/00
    • G01N23/046G01N2223/419
    • A method of calibrating a linear pushbroom imaging device used in non-destructive testing of a part manufactured according to a CAD model involves identifying the location of fixed reference points, such as tooling balls in the CAD model. Positioning the part on a fixture having tooling balls fixed relative to each other in the same manner as those in the CAD model. Adjusting the part on the fixture such that points on the surface of the part known to be accurate have the same locations relative to the tooling bails as the CAD part is to the CAD tooling balls. Obtaining several projection images of the part and tooling balls at different angles about an axis of rotation passing through the part. Using the known 3D locations of the center of the CAD tooling balls and the corresponding measured screen locations of the is actual tooling balls, transformation matrices, G, M.sub.j may iteratively be determined which map points on the 3D CAD model to 3D points of the part and then map the 3D points of the part to the 2D screen coordinates of each projection image, respectively. This provides a method of determining theoretical correct point locations in a coordinate system fixed with respect to the part, and theoretically correct screen coordinates in a reference frame fixed with respect to the imaging device.
    • 校准用于根据CAD模型制造的零件的非破坏性测试中的线性推压成像装置的方法包括识别固定参考点的位置,例如CAD模型中的模具球。 以与CAD模型相同的方式将零件定位在具有相对于彼此固定的工具球的夹具上。 调整夹具上的零件,使得已知准确的零件表面上的点与CAD零件相对于CAD模具球具有相对于加工支点相同的位置。 围绕通过该部件的旋转轴以不同的角度获得部件和加工球的几个投影图像。 使用CAD工具球的中心的已知3D位置和相应的测量的屏幕位置是实际的工具球,转换矩阵G,Mj可以迭代地确定3D CAD模型上的哪些映射点到零件的3D点 然后将该部分的3D点分别映射到每个投影图像的2D屏幕坐标。 这提供了一种在相对于该部件固定的坐标系中确定理论正确点位置的方法,并且在相对于成像装置固定的参考系中理论上校正屏幕坐标。
    • 9. 发明授权
    • Correlation methods of identifying defects in imaging devices
    • 识别成像设备缺陷的相关方法
    • US5361307A
    • 1994-11-01
    • US37191
    • 1993-03-25
    • Richard I. HartleyA. Nadeem IshaqueAiman A. Abdel-Malek
    • Richard I. HartleyA. Nadeem IshaqueAiman A. Abdel-Malek
    • G06T7/00H04N17/00G06K9/64
    • G06T7/0006H04N17/002G06T2207/10116G06T2207/30108
    • An automated system for determining artifacts in images indicating defects in an imaging device being tested employs a constant radiation source which supplies radiation of spatially uniform intensity to the imaging device to be tested. The imaging device then creates a flood image A.sup.(0). A region of interest (ROI) mask means for all pixel values of flood image A.sup.(0) sets values to zero outside of the imaging devices field of view to produce a flood image A.sup.(1). An image normalization means normalizes flood image A.sup.(1) to have an average value of zero producing a normalized flood image A. A correlation means performs an autocorrelation of normalized flood image A to produce a correlation field which is then masked to select portions of the correlation field. The correlation values of the selected regions are summed, the squares of the correlation values are summed and the resulting sums are normalized for mask shape and flood image intensity to determine and quantify the presence of specific artifacts. These normalized summed values may be compared to predetermined thresholds to determine if the artifacts have a magnitude above an acceptable level. Based upon the results of the comparison, a corrective action may be taken such as removing the imaging device from a manufacturing line or adjusting the imaging device and retesting it.
    • 用于确定图像中的人造物的自动化系统,其指示正被测试的成像装置中的缺陷,其采用将空间均匀强度的辐射提供给要测试的成像装置的恒定辐射源。 然后,成像装置创建洪水图像A(0)。 用于洪水图像A(0)的所有像素值的感兴趣区域(ROI)掩模装置将成像装置视野外的值设置为零以产生洪水图像A(1)。 图像归一化装置将洪水图像A(1)归一化为具有平均值零,产生归一化的洪水图像A.相关装置执行归一化泛洪图像A的自相关,以产生相关区域,然后将相关区域进行掩蔽以选择部分 相关领域。 将所选择的区域的相关值相加,将相关值的平方相加,并将所得到的和归一化为掩模形状和洪水图像强度,以确定和量化特定伪像的存在。 这些标准化的总和值可以与预定阈值进行比较,以确定假象是否具有高于可接受水平的幅度。 基于比较的结果,可以采取校正动作,例如从生产线移除成像装置或调整成像装置并重新测试。
    • 10. 发明授权
    • X-ray fluoroscopy system for reducing dosage employing iterative power
ratio estimation
    • X射线荧光透视系统,用于减少剂量,采用迭代功率比估计
    • US5293415A
    • 1994-03-08
    • US956203
    • 1992-10-05
    • Richard I. HartleyAiman A. Abdel-MalekJohn J. Bloomer
    • Richard I. HartleyAiman A. Abdel-MalekJohn J. Bloomer
    • H05G1/46H05G1/60H05G1/44
    • H05G1/60H05G1/46
    • An interactive system for producing acceptable quality fluoroscopy images determines X-ray tube photon count and voltage while minimizing X-ray radiation dosage to a subject. Parameters of the subject and the type of image to be produced are provided to the system. X-ray tube voltage and current are initialized at a fraction of conventional values for a portion of a subject to be imaged. An image is then created and transformed. A power ratio of low frequency components to high frequency components is calculated indicating quality of the image. Images are produced and adjusted until the maximum exposure is reached, or the power ratio does not increase beyond a quality increment. The process is repeated to optimize X-ray tube voltage. The X-ray fluoroscopy procedure is performed with the optimum X-ray tube photon count and the optimum voltage thereby reducing X-ray dosage. The optimization is repeated periodically to readjust the system.
    • 用于产生可接受质量的荧光透视图像的交互式系统确定X射线管光子计数和电压,同时使对受试者的X射线辐射剂量最小化。 将要生成的对象的参数和图像的类型提供给系统。 X射线管的电压和电流被初始化为待成像对象的一部分的常规值的一部分。 然后创建和转换图像。 计算低频分量与高频分量的功率比,指示图像的质量。 生成和调整图像直到达到最大曝光量,或者功率比不会超过质量增量。 重复该过程以优化X射线管电压。 用最佳X射线管光子计数和最佳电压进行X射线透视程序,从而降低X射线剂量。 定期重复优化以重新调整系统。