公开(公告)号：US5018852A

公开(公告)日：1991-05-28

申请号：US568129

申请日：1990-08-16

申请人： Li-Jen Cheng ,  Tsuen-Hsi Liu

发明人： Li-Jen Cheng ,  Tsuen-Hsi Liu

IPC分类号： G01P3/36 ,  G01S17/50 ,  G01S17/66 ,  G01S17/89

CPC分类号： G01P3/36 ,  G01S17/50 ,  G01S17/66 ,  G01S17/89

摘要： A method and apparatus for detecting and tracking moving objects in a noise environment cluttered with fast- and slow-moving objects and other time-varying background. A pair of phase conjugate light beams carrying the same spatial information commonly cancel each other out through an image subtraction process in a phase conjugate interferometer, wherein gratings are formed in a fast photorefractive phase conjugate mirror material. In the steady state, there is no output. When the optical path of one of the two phase conjugate beams is suddenly changed, the return beam loses its phase conjugate nature and the interferometer is out of balance, resulting in an observable output. The observable output lasts until the phase conjugate nature of the beam has recovered. The observable time of the output signal is roughly equal to the formation time of the grating. If the optical path changing time is slower than the formation time, the change of optical path becomes unobservable, because the index grating can follow the change. Thus, objects traveling at speeds which result in a path changing time which is slower than the formation time are not observable and do not clutter the output image view.

摘要翻译： 一种用于在与快速和慢移物体和其他时变背景混杂的噪声环境中检测和跟踪移动物体的方法和装置。 携带相同空间信息的一对相位共轭光通常通过相位共轭干涉仪中的图像相减处理相互抵消，其中光栅形成在快速光折射相位共轭镜材料中。 在稳定状态下，没有输出。 当两相共轭光之一的光路突然变化时，返回光束失去其相位共轭特性，干涉仪失去平衡，产生可观察的输出。 可观察的输出持续直到光束的相位共轭特性恢复。 输出信号的可观察时间大致等于光栅的形成时间。 如果光路变化时间比形成时间慢，光路的变化变得不可观察，因为折射率光栅可以跟随变化。 因此，导致比形成时间慢的路径变化时间的速度行驶的物体是不可观察的，并且不会混乱输出图像视图。

公开(公告)号：US5376807A

公开(公告)日：1994-12-27

申请号：US46331

申请日：1993-04-07

申请人： Tsuen-Hsi Liu ,  Tien-Hsin Chao ,  Li-Jen Cheng

发明人： Tsuen-Hsi Liu ,  Tien-Hsin Chao ,  Li-Jen Cheng

IPC分类号： G06E3/00 ,  G06F15/336 ,  G06K9/64

CPC分类号： G06E3/003

摘要： A new type of optical correlator performs motion detection or background clutter suppression and correlation simultaneously in a single photorefractive crystal, and is useful for moving target identification and tracking and for stationary clutter rejection. The correlation is of the VanderLugt type and the motion detection or background clutter suppression is based on the erasing property of photorefractive crystals.

摘要翻译： 一种新型的光学相关器在单个光折变晶体中同时执行运动检测或背景杂波抑制和相关性，并且可用于移动目标识别和跟踪以及静态杂波抑制。 相关性为VanderLugt类型，运动检测或背景杂波抑制基于光折射晶体的擦除性质。

公开(公告)号：US5150228A

公开(公告)日：1992-09-22

申请号：US797569

申请日：1991-11-25

申请人： Tsuen-Hsi Liu ,  Li-Jen Cheng

发明人： Tsuen-Hsi Liu ,  Li-Jen Cheng

IPC分类号： G06E3/00 ,  G06K9/58

CPC分类号： G06E3/003 ,  G06K9/58

摘要： Edge enhancement of an input image by four-wave mixing a first write beam with a second write beam in a photorefractive crystal, e.g., GaAs, achieved for VanderLugt optical correlation with an edge enhanced reference image by optimizing the power ratio of a second write beam to the first write beam, e.g., 70:1, and optimizing the power ratio of a read beam, which carries the reference image to the first write beam, e.g., 100:701. Liquid crystal TV panels are employed as spatial light modulators in order to change the input and reference images in real time.

摘要翻译： 通过在光折射晶体（例如GaAs）中将第一写入光束与第二写入光束四波混合来输入图像的边缘增强，通过优化第二写入光束的功率比来实现与边缘增强参考图像的VanderLugt光学相关 到第一个写入光束，例如70：1，并优化将参考图像传送到第一个写入光束的读取光束的功率比例如100：701。 采用液晶电视面板作为空间光调制器，以实时改变输入和参考图像。

公开(公告)号：US06272095B1

公开(公告)日：2001-08-07

申请号：US08427721

申请日：1995-04-21

申请人： Tsuen-Hsi Liu ,  Demetri Psaltis ,  Fai H. Mok ,  Gan Zhou

发明人： Tsuen-Hsi Liu ,  Demetri Psaltis ,  Fai H. Mok ,  Gan Zhou

IPC分类号： G11B700

CPC分类号： G11B7/1381 ,  G03H2001/0415 ,  G03H2001/0417 ,  G03H2001/266 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/0065 ,  G11B7/007 ,  G11B7/00772 ,  G11B7/12 ,  G11B7/28

摘要： An optical memory for storing and/or reading data on an optical disk. The optical disk incorporates a material in which holographic gratings can be created at plural locations within the disk. An electro-optical head which is capable of creating these holographic gratings at any one of the plural locations is employed. The head is additionally capable of detecting the presence or absence of a holographic grating at any one of these plural locations. The presence of the holographic grating could indicate a first binary state and the absence of the holographic grating indicate a second state. Alternately, the electro-optical head could be used to vary the diffraction efficiency of the holographic gratings during their creation. In that case, the head would also be capable of detecting this variation in efficiency and produce a proportional detection signal. This signal would be used as an indicator of the value of the stored data element. The material of the optical disk is further capable of having multiple holographic gratings created at each one of the plural locations. These multiple holographic gratings are created via a beam of light from the electro-optical head which has a different wavelength or point of focus. In reading these holographic gratings, a beam of light generated by the electro-optical head is sequentially varied in wavelength or point of focus to correspond to the wavelength or point of focus and the sequence of wavelengths or points of focus employed to record each one of the data elements recorded.

摘要翻译： 一种用于在光盘上存储和/或读取数据的光学存储器。 光盘结合了一种材料，其中可以在盘内的多个位置处产生全息光栅。 采用能够在多个位置的任何一个处产生这些全息光栅的电光头。 头部还能够在这些多个位置中的任何一个处检测全息光栅的存在或不存在。 全息光栅的存在可以指示第一二进制状态，并且不存在全息光栅指示第二状态。 或者，电光头可以用于改变全息光栅在其创建期间的衍射效率。 在这种情况下，磁头还能够检测这种效率变化并产生比例检测信号。 该信号将用作存储的数据元素的值的指示符。 光盘的材料还能够具有在多个位置中的每一个处产生的多个全息光栅。 这些多个全息光栅通过具有不同波长或焦点的电光头的光束产生。 在读取这些全息光栅时，由光电头产生的光束在波长或焦点上依次变化，以对应于波长或聚焦点，并且波长或聚焦点用于记录每个 记录数据元素。

公开(公告)号：US06898167B2

公开(公告)日：2005-05-24

申请号：US09924218

申请日：2001-08-07

申请人： Tsuen-Hsi Liu ,  Demetri Psaltis ,  Fai H. Mok ,  Gan Zhou

发明人： Tsuen-Hsi Liu ,  Demetri Psaltis ,  Fai H. Mok ,  Gan Zhou

IPC分类号： G11B7/0045 ,  G11B7/005 ,  G11B7/0065 ,  G11B7/007 ,  G11B7/12 ,  G11B7/135 ,  G11B7/00

CPC分类号： G11B7/1381 ,  G03H2001/0415 ,  G03H2001/0417 ,  G03H2001/266 ,  G11B7/0045 ,  G11B7/005 ,  G11B7/0065 ,  G11B7/007 ,  G11B7/00772 ,  G11B7/12 ,  G11B7/28

摘要： An optical memory for storing and/or reading data on an optical disk. The optical disk incorporates a material in which holographic gratings can be created, and subsequently detected, at plural locations within the disk by an electro-optical head. Creation and detection of holographic gratings with variable diffraction efficiency is possible with the electro-optical head. Multiple holographic gratings can also be created at each one of the plural locations via a beam of light which has a different wavelength or point of focus. These data elements can be read by the electro-optical head using a beam of light sequentially varied in wavelength or point of focus to correspond to the multiple holographic gratings to be recorded.

摘要翻译： 一种用于在光盘上存储和/或读取数据的光学存储器。 光盘包括一种材料，其中可以通过电光头在光盘内的多个位置处产生全息光栅并随后检测全息光栅。 使用电光头可以创建和检测具有可变衍射效率的全息光栅。 也可以通过具有不同波长或焦点的光束在多个位置的每一个处产生多个全息光栅。 这些数据元素可以由电光头使用在波长或焦点上顺序变化的光束对应于待记录的多个全息光栅。