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    • 12. 发明授权
    • Moving target detection in the presence of parallax
    • 在存在视差的情况下移动目标检测
    • US08340349B2
    • 2012-12-25
    • US11763559
    • 2007-06-15
    • Garbis SalgianSupun SamarasekeraJiangjian XiaoJames Russell BergenRakesh KumarFeng Han
    • Garbis SalgianSupun SamarasekeraJiangjian XiaoJames Russell BergenRakesh KumarFeng Han
    • G06K9/00
    • G06K9/3241G06K9/209G06T7/285G06T2207/10021G06T2207/30212G06T2207/30252
    • A method for detecting a moving target is disclosed that receives a plurality of images from at least one camera; receives a measurement of scale from one of a measurement device and a second camera; calculates the pose of the at least one camera over time based on the plurality of images and the measurement of scale; selects a reference image and an inspection image from the plurality of images of the at least one camera; and detects a moving target from the reference image and the inspection image based on the orientation of corresponding portions in the reference image and the inspection image relative to a location of an epipolar direction common to the reference image and the inspection image; and displays any detected moving target on a display. The measurement of scale can derived from a second camera or, for example, a wheel odometer. The method can also detect moving targets by combining the above epipolar method with a method based on changes in depth between the inspection image and the reference image and based on changes in flow between the inspection image and the reference image.
    • 公开了一种用于检测移动目标的方法,其从至少一个相机接收多个图像; 从测量装置和第二相机中的一个接收刻度的测量; 基于多个图像和尺度的测量来计算随时间的至少一个相机的姿态; 从所述至少一个照相机的多个图像中选择参考图像和检查图像; 并且基于所述参考图像和所述检查图像中的对应部分相对于所述参考图像和所述检查图像共同的核极方向的位置的取向,从所述参考图像和所述检查图像中检测移动目标; 并在显示器上显示任何检测到的移动目标。 刻度的测量可以从第二相机或例如车轮里程表得到。 该方法还可以通过将上述对极方法与基于检查图像和参考图像之间的深度变化的方法并基于检查图像与参考图像之间的流动变化组合来检测移动目标。
    • 18. 发明授权
    • Reduction of hitlist size in spiral cone beam CT by use of local radon
origins
    • 通过使用局部氡气起源减少螺旋锥束CT中的击打表大小
    • US5901196A
    • 1999-05-04
    • US940489
    • 1997-09-30
    • Frank SauerSupun SamarasekeraKwok Tam
    • Frank SauerSupun SamarasekeraKwok Tam
    • A61B6/03G01N23/04G06T1/00
    • G01N23/046A61B6/027G01N2223/419Y10S378/901
    • A method and apparatus for reconstructing an image of an object using a three dimensional (3D) computerized tomographic (CT) imager having a cone beam radiation source and detector arrangement for acquiring measurement data. The source and detector arrangement is operated at a plurality of source positions along a spiral scan path so as to acquire a corresponding plurality of sets of measurement data representative of radiation attenuation caused by the object. Image reconstruction processing information required for processing of the acquired measurement data in a Radon space partitioned by plurality of vertically oriented coaxial .phi.-planes for reconstructing the image, is pre-calculated and stored in a hitlist. The stored information is pre-calculated on less that all of the .phi.-planes, but due to a symmetry that is induced in the reconstruction processing, the stored information can be used for calculating Radon data for all of the .phi.-planes that partition the Radon space. The size of the hitlist is thus reduced by a factor equal to the number of .phi.-planes for which the stored information is re-used, e.g., 360 for 1/2 degree .phi.-plane spacing and storage of reconstruction processing information for a single .phi.-plane.
    • 一种使用具有用于获取测量数据的锥形束辐射源和检测器装置的三维(3D)计算机断层摄影(CT)成像器来重建物体的图像的方法和装置。 源和检测器布置在沿着螺旋扫描路径的多个源位置处操作,以便获取表示由对象引起的辐射衰减的相应多组测量数据。 在由用于重构图像的多个垂直取向的同轴电极划分的氡空间中处理所获取的测量数据所需的图像重建处理信息被预先计算并存储在命中列表中。 所存储的信息预先计算得比所有的phi-plane少,但是由于在重构处理中引起的对称性,所存储的信息可以用于计算所有分区的phi-plane的Radon数据 氡空间。 因此,命中列表的大小被减少了等于重新使用所存储的信息的电路数量的因子,例如,对于+ E,360/1 + 2 + EE度phi平面间隔和 单个飞机的重建处理信息。