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71. 发明授权

US06959869B2 Automatic vehicle identification (AVI) system employing planar laser illumination and imaging (PLIIM) based subsystems 失效
标题翻译：采用平面激光照明和成像（PLIIM）的子系统的自动车辆识别（AVI）系统
公开(公告)号：US06959869B2
公开(公告)日：2005-11-01
申请号：US10161091
申请日：2002-05-31
申请人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Michael D. Schnee
发明人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Michael D. Schnee
IPC分类号： G02B6/42 , G06C11/08 , G06F17/00 , G06K7/10 , G06K7/14 , G06K9/22 , G07B15/06 , H01S3/00 , H01S3/08 , H01S5/00 , H01S5/022 , H01S5/40
CPC分类号： G06K9/26 , G02B27/48 , G06K7/10594 , G06K9/325 , G07B15/06 , H01S5/005 , H01S5/02248 , H01S5/4025
摘要： An automatic vehicle identification (AVI) system for installation along a roadway, comprising one or more a planar laser illumination and imaging (PLIIM) based linear imaging subsystems mounted above the roadway in a spaced apart manner. The PLIIM based subsystems are arranged for capturing digital linear images of both the front and rear license plates mounted on each moving vehicle travelling under the PLIIM based linear imaging subsystem, and generating digital image data representative of each captured digital linear image. An image processing subsystem is provided for receiving and processing the digital image data generated by the PLIIM-based imaging systems, so as to automatically read the alphanumeric strings on the front and/or rear license plates of each the vehicle. These recognized strings are then compared against vehicle registration information stored in a database in order to identify each vehicle travelling under along the roadway. By virtual of the present invention, it is now possible to capture and buffer high-resolution linear images of the license plates on moving vehicles using planar laser illumination beams and coplanar fields of view, so that these linear images can be sequentially assembled to construct 2-D images for OCR processing so that such vehicles can be automatically identified, while avoiding the need for large and expensive high-intensity lighting equipment required by conventional digital cameras employing 2-D electronic image detectors.
摘要翻译：一种用于沿道路安装的自动车辆识别（AVI）系统，包括以间隔开的方式安装在道路上方的一个或多个基于平面激光照明和成像（PLIIM）的线性成像子系统。基于PLIIM的子系统被布置用于捕获安装在基于PLIIM的线性成像子系统下的每个移动车辆上的前后车牌的数字线性图像，以及生成表示每个捕获的数字线性图像的数字图像数据。提供图像处理子系统，用于接收和处理由基于PLIIM的成像系统产生的数字图像数据，以便自动读取每个车辆的前部和/或后部车牌上的字母数字串。然后将这些识别的字符串与存储在数据库中的车辆登记信息进行比较，以便识别沿着道路行进的每辆车辆。通过本发明，现在可以使用平面激光照明光束和共面视场来捕获并缓冲移动车辆上的车牌的高分辨率线性图像，使得这些线性图像可以被顺序组装以构成2 -D图像，以便能够自动识别这种车辆，同时避免需要使用2-D电子图像检测器的常规数字照相机所需的大型和昂贵的高强度照明设备。

72. 发明授权

US07104454B2 Automated system and method for identifying and measuring packages transported through an omnidirectional laser scanning tunnel 失效
标题翻译：用于识别和测量通过全向激光扫描隧道传输的包装的自动化系统和方法
公开(公告)号：US07104454B2
公开(公告)日：2006-09-12
申请号：US10438797
申请日：2003-05-15
申请人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
发明人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
IPC分类号： B06K7/10
CPC分类号： G06K7/10861 , G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K17/0022 , G06K2207/1013 , G07F11/002 , G07G1/0054
摘要： A fully automated package identification and measuring system, in which an omni-directional holographic scanning tunnel is used to read bar codes on packages entering the tunnel, while a package dimensioning subsystem is used to capture information about the package prior to entry into the tunnel. Mathamatical models are created on a real-time basis for the geometry of the package and the position of the laser scanning beam used to read the bar code symbol thereon. The mathamatical models are analyzed to determine if collected and queued package identification data is spatially and/or temporally correlated with package measurement data using vector-based ray-tracing methods, homogeneous transformations, and object-oriented decision logic so as to enable simultaneous tracking of multiple packages being transported through the scanning tunnel.
摘要翻译：全自动包装识别和测量系统，其中使用全向全息扫描隧道来读取进入隧道的包装上的条形码，同时使用包装尺寸子系统在进入隧道之前捕获关于包装的信息。实时地为包装的几何形状和用于读取其上的条形码符号的激光扫描光束的位置创建数学模型。分析数学模型，以确定收集的和排队的包裹识别数据是否与包装测量数据在空间上和/或时间上相关，使用基于矢量的光线跟踪方法，均匀变换和面向对象的决策逻辑，以便能够同时跟踪多个包裹通过扫描隧道传送。

73. 发明授权

US06517004B2 Automated system for identifying and dimensioning packages transported through a laser scanning tunnel using laser scanning beam indexing techniques 失效
标题翻译：用于通过激光扫描光束索引技术识别并确定通过激光扫描隧道传输的包装的自动化系统
公开(公告)号：US06517004B2
公开(公告)日：2003-02-11
申请号：US09157778
申请日：1998-09-21
申请人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
发明人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
IPC分类号： G06K710
CPC分类号： G06K7/10861 , G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K17/0022 , G06K2207/1013 , G07F11/002 , G07G1/0054
摘要： A fully automated package identification and measuring system, in which an omni-directional holographic scanning tunnel is used to read bar codes on packages entering the tunnel, while a package dimensioning subsystem is used to capture information about the package prior to entry into the tunnel. Mathematical models are created on a real-time basis for the geometry of the package and the position of the laser scanning beam used to read the bar code symbol thereon. The mathematical models are analyzed to determine if collected and queued package identification data is spatially and/or temporally correlated with package measurement data using vector-based ray-tracing methods, homogeneous transformations, and object-oriented decision logic so as to enable simultaneous tracking of multiple packages being transported through the scanning tunnel.
摘要翻译：全自动包装识别和测量系统，其中使用全向全息扫描隧道来读取进入隧道的包装上的条形码，同时使用包装尺寸子系统在进入隧道之前捕获关于包装的信息。数学模型是为了封装的几何形状和用于读取其上的条形码符号的激光扫描光束的位置而实时创建的。对数学模型进行分析，以确定收集的和排队的包裹识别数据是否与包装测量数据在空间和/或时间上相关，使用基于矢量的光线跟踪方法，均匀变换和面向对象的决策逻辑，以便能够同时跟踪多个包裹通过扫描隧道传送。

74. 发明授权

US06616048B2 Automated system and method for identifying and measuring packages transported through an omnidirectional laser scanning tunnel 失效
标题翻译：用于识别和测量通过全向激光扫描隧道传输的包装的自动化系统和方法
公开(公告)号：US06616048B2
公开(公告)日：2003-09-09
申请号：US10076912
申请日：2002-02-14
申请人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
发明人： Timothy A. Good , Andrew D. Dehennis , Xiaoxun Zhu , David M. Wilz, Sr. , George B. Rockstein , Stephen J. Colavito , Robert E. Blake , Ka Man Au , George Kolis , C. Harry Knowles
IPC分类号： G06K710
CPC分类号： G06K7/10861 , G02B26/106 , G06K7/10 , G06K7/10564 , G06K7/10584 , G06K7/10594 , G06K7/10603 , G06K7/10663 , G06K7/10673 , G06K7/10693 , G06K7/10702 , G06K7/10792 , G06K7/10801 , G06K7/10811 , G06K7/10851 , G06K7/10871 , G06K7/10881 , G06K7/10891 , G06K7/109 , G06K7/14 , G06K17/0022 , G06K2207/1013 , G07F11/002 , G07G1/0054
摘要： A fully automated package identification and measuring system in which an omni-directional holographic scanning tunnel is used to read bar codes on packages entering the tunnel, while a package dimensioning subsystem is used to capture information about the package prior to entry into the tunnel. Mathematical models are created on a real-time basis for the geometry of the package and the position of the laser scanning beam used to read the bar code symbol hereon. The mathematical models area analyzed to determine if collected and queued package identification data is spatially and/or temporally correlated with package measurement data using vector-based ray-tracing methods, homogenous transformations, and object-oriented decision logic so as to enable simultaneous tracking of multiple packages being transported through the scanning tunnel.
摘要翻译：全自动包装识别和测量系统，其中使用全向全息扫描隧道来读取进入隧道的包装上的条形码，同时使用包装尺寸子系统在进入隧道之前捕获有关包装的信息。数学模型是为了封装的几何形状和用于读取条形码符号的激光扫描光束的位置而实时创建的。分析数学模型区域，以确定是否收集和排队的包装识别数据与包装测量数据在空间和/或时间上相关，使用基于矢量的光线跟踪方法，均匀变换和面向对象的决策逻辑，以便能够同时跟踪多个包裹通过扫描隧道传送。

75. 发明授权

US06959870B2 Planar LED-based illumination array (PLIA) chips 失效
标题翻译：平面LED基照明阵列（PLIA）芯片
公开(公告)号：US06959870B2
公开(公告)日：2005-11-01
申请号：US10067140
申请日：2002-02-04
申请人： Constantine J. Tsikos , Timothy A. Good , Thomas Amundsen , C. Harry Knowles
发明人： Constantine J. Tsikos , Timothy A. Good , Thomas Amundsen , C. Harry Knowles
IPC分类号： G02B26/10 , G02B27/48 , G06K7/10 , G06K7/14 , H01S5/022 , H01S5/40
CPC分类号： G02B19/0066 , B82Y15/00 , G02B19/0014 , G02B19/0028 , G02B19/0057 , G02B19/009 , G02B26/10 , G02B26/105 , G02B27/0961 , G02B27/0966 , G02B27/48 , G06K7/10554 , G06K7/10683 , G06K7/10722 , G06K7/10732 , G06K7/10811 , G06K7/10861 , H01S5/02248 , H01S5/4025
摘要： Methods of and systems for illuminating objects using planar laser illumination beams having substantially-planar spatial distribution characteristics that extend through the field of view (FOV) of image formation and detection modules employed in such systems. Each planar laser illumination beam is produced from a planar laser illumination beam array (PLIA) comprising an plurality of planar laser illumination modules (PLIMs). Each PLIM comprises a visible laser diode (VLD, a focusing lens, and a cylindrical optical element arranged therewith. The individual planar laser illumination beam components produced from each PLIM are optically combined to produce a composite substantially planar laser illumination beam having substantially uniform power density characteristics over the entire spatial extend thereof and thus the working range of the system. Preferably, each planar laser illumination beam component is focused so that the minimum beam width thereof occurs at a point or plane which is the farthest or maximum object distance at which the system is designed to acquire images, thereby compensating for decreases in the power density of the incident planar laser illumination beam due to the fact that the width of the planar laser illumination beam increases in length for increasing object distances away from the imaging optics. Advanced high-resolution wavefront control methods and devices are disclosed for use with the PLIIM-based systems in order to reduce the power of speckle-noise patterns observed at the image detections thereof. By virtue of the present invention, it is now possible to use both VLDs and high-speed CCD-type image detectors in conveyor, hand-held and hold-under type imaging applications alike, enjoying the advantages and benefits that each such technology has to offer, while avoiding the shortcomings and drawbacks hitherto associated therewith.
摘要翻译：使用具有基本上平面的空间分布特性的平面激光照明光束照射物体的方法和系统，其延伸通过图像形成的视野（FOV）和在这种系统中使用的检测模块。每个平面激光照明光束由包括多个平面激光照射模块（PLIM）的平面激光照射束阵列（PLIA）产生。每个PLIM包括可见激光二极管（VLD，聚焦透镜和与其配置的圆柱形光学元件），由每个PLIM产生的各个平面激光照明光束分量被光学组合以产生具有基本上均匀功率密度的复合基本上平面的激光照明光束优选地，每个平面激光照射光束分量被聚焦，使得其最小光束宽度发生在最远或最大物体距离的点或平面处，在该点或平面处，系统被设计成获取图像，从而补偿入射的平面激光照射光束的功率密度的降低，这是由于平面激光照射光束的宽度在增加物镜距离成像光学元件的长度上增加的事实，高级高公开了分辨率波前控制方法和装置与基于PLIIM的系统一起使用，以便减少在其图像检测时观察到的斑点噪声模式的功率。凭借本发明，现在可以在输送机，手持和保持型成像应用中同时使用VLD和高速CCD型图像检测器，享受每种这样的技术具有的优点和益处提供，同时避免迄今为止的缺点和缺点。

76. 发明授权

US06739511B2 METHOD OF SPECKLE-NOISE PATTERN REDUCTION AND APPARATUS THEREFOR BASED ON REDUCING THE TEMPORAL-COHERENCE OF THE PLANAR LASER ILLUMINATION BEAM BEFORE IT ILLUMINATES THE TARGET OBJECT BY APPLYING TEMPORAL PHASE MODULATION TECHNIQUES DURING THE TRANSMISSION OF THE PLIB TOWARDS THE TARGET 失效
公开(公告)号：US06739511B2
公开(公告)日：2004-05-25
申请号：US10136621
申请日：2002-04-30
申请人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
发明人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
IPC分类号： G06K710
CPC分类号： G06K7/10 , G02B19/0014 , G02B19/0052 , G02B19/0085 , G02B19/009 , G02B19/0095 , G02B26/10 , G02B27/095 , G02B27/48 , G06K7/10594 , G06K7/10732 , G06K7/146 , G06K9/26 , G06K9/325 , H01S5/005 , H01S5/02248 , H01S5/4025
摘要： A planar laser illumination and imaging (PLLIM) based camera system capable of producing digital images with reduced levels of speckle-pattern noise. The PLIIM based camera system comprises a planar laser illumination array (PLIA) including a plurality of laser diodes for producing and projecting a planar laser illumination beam (PLIB), so as to illuminate an object as it is moving past said PLIIM based camera system. An image formation and detection (IFD) module is provided having a image detection array and imaging forming optics for providing the image detection array with a field of view (FOV). The PLIB and FOV are arranged in a coplanar relationship along the working range of the PLIIM based camera system so that the PLIB illuminates primarily within the FOV of the IFD module. A speckle-pattern noise reduction subsystem is integrated with the PLIA, for reducing the temporal-coherence of said planar laser illumination beam (PLIB) before the PLIB illuminates a target object. The speckle-pattern noise reduction subsystem carries out a temporal phase modulation technique during the transmission of the PLIB towards the target, so that the object is illuminated with a temporally coherent-reduced planar laser illumination beam (PLIB) and numerous substantially different time-varying speckle-noise patterns are produced at the image detection array over the photo-integration time period thereof. The numerous substantially different time-varying speckle-noise patterns are detected at the image detection array over the photo-integration time period, and the detected speckle-noise patterns are temporally averaged at said image detection array during the photo-integration time period thereof. As a result of such temporal averaging, the RMS power of observable speckle-noise patterns is reduced at the image detection array. By virtue of the present invention, it is now possible to enjoy the benefits of using laser-based illumination during high-speed imaging operations, without the adverse effects associated with speckle-pattern noise.

77. 发明授权

US07513428B2 Planar laser illumination and imaging device employing laser current modulation to generate spectral components and reduce temporal coherence of laser beam, so as to achieve a reduction in speckle-pattern noise during time-averaged detection of images of objects illuminated thereby during imaging operations 失效
标题翻译：使用激光电流调制的平面激光照明和成像装置产生光谱分量并减少激光束的时间相干性，从而在成像操作期间由此照射的物体的图像的时间平均检测期间实现斑点图案噪声的减少
公开(公告)号：US07513428B2
公开(公告)日：2009-04-07
申请号：US11603349
申请日：2006-11-21
申请人： Patrick Giordano , Stephen Colavito , Allan Wirth , William Svedas , Timothy A. Good , Andrew Jankevics , C. Harry Knowles , Constantine J. Tsikos
发明人： Patrick Giordano , Stephen Colavito , Allan Wirth , William Svedas , Timothy A. Good , Andrew Jankevics , C. Harry Knowles , Constantine J. Tsikos
IPC分类号： G06K7/10
CPC分类号： G06K7/10 , H04N1/02865 , H04N1/03
摘要： An imaging device including at least one imaging array and image formation optics that provide a field of view corresponding to the imaging array. At least one illumination module (which includes at least one source of coherent illumination) produces planar light illumination that substantially overlaps the field of view corresponding to the imaging array. Illumination control circuitry modulates the power level of illumination produced by the source of coherent illumination during each photo-integration time period of the imaging array to thereby reduce speckle noise in images captured by the imaging array. The illumination control circuitry preferably modulates the power level of illumination by controlling the number and/or duration of time periods corresponding to different power levels of illumination produced by the source of coherent illumination during each photo-integration time period of the imaging array.
摘要翻译：一种成像装置，包括至少一个成像阵列和图像形成光学器件，其提供对应于成像阵列的视场。至少一个照明模块（其包括至少一个相干照明源）产生基本上与对应于成像阵列的视野重叠的平面光照射。照明控制电路在成像阵列的每个光积分时间段期间调制由相干照明源产生的照明的功率电平，从而减少由成像阵列捕获的图像中的斑点噪声。照明控制电路优选地通过控制对应于在成像阵列的每个光合成时间段期间由相干照明源产生的不同功率电平的时间段的数量和/或持续时间来调制照明的功率电平。

78. 发明授权

US07140543B2 Planar light illumination and imaging device with modulated coherent illumination that reduces speckle noise induced by coherent illumination 失效
标题翻译：平面光照和具有调制相干照明的成像装置，可减少由相干照明引起的斑点噪声
公开(公告)号：US07140543B2
公开(公告)日：2006-11-28
申请号：US10186276
申请日：2002-06-27
申请人： Patrick Giordano , Stephen Colavito , Allan Wirth , William Svedas , Timothy A. Good , Andrew Jankevics , C. Harry Knowles , Constantine J. Tsikos
发明人： Patrick Giordano , Stephen Colavito , Allan Wirth , William Svedas , Timothy A. Good , Andrew Jankevics , C. Harry Knowles , Constantine J. Tsikos
IPC分类号： G06K7/10 , G06K7/14
CPC分类号： G06K7/10732 , G02B27/48 , G06K7/10594 , G06K7/10752 , G06K9/26 , G06K9/325 , G06K2207/1018
摘要： A device including at least one image detection array and image formation optics that provide a field of view corresponding to the image detection array. At least one illumination module (which includes at least one source of coherent illumination) produces planar light illumination that substantially overlaps the field of view corresponding to the image detection array. Illumination control circuitry modulates the power level of illumination produced by the source of coherent illumination during each photo-integration time period of the image detection array to thereby reduce speckle noise in images captured by the image detection array. The illumination control circuitry preferably modulates the power level of illumination by controlling the number and/or duration of time periods corresponding to different power levels of illumination produced by the source of coherent illumination during each photo-integration time period of the image detection array.
摘要翻译：一种包括至少一个图像检测阵列和图像形成光学器件的装置，其提供对应于图像检测阵列的视场。至少一个照明模块（其包括至少一个相干照明源）产生基本上与对应于图像检测阵列的视野重叠的平面光照射。照明控制电路在图像检测阵列的每个光积分时间段期间调制由相干照明源产生的照明的功率电平，从而减少由图像检测阵列捕获的图像中的斑点噪声。照明控制电路优选地通过控制对应于由图像检测阵列的每个光积分时间段期间的相干照明源产生的不同照明功率电平的时间段的数量和/或持续时间来调制照明的功率电平。

79. 发明授权

US06880756B2 METHOD OF SPECKLE-NOISE PATTERN REDUCTION AND APPARATUS THEREFOR BASED ON REDUCING THE TEMPORAL-COHERENCE OF THE PLANAR LASER ILLUMINATION BEAM (PLIB) AFTER IT ILLUMINATES THE TARGET BY APPLYING TEMPORAL INTENSITY MODULATION TECHNIQUES DURING THE DETECTION OF THE REFLECTED/SCATTERED PLIB 失效
公开(公告)号：US06880756B2
公开(公告)日：2005-04-19
申请号：US10136463
申请日：2002-04-30
申请人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
发明人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
IPC分类号： G02B6/42 , G02B27/48 , G06C11/08 , G06F17/00 , G06K7/10 , G06K7/14 , G06K9/22 , G07B15/06 , H01S3/00 , H01S3/08 , H01S5/00 , H01S5/022 , H01S5/40
CPC分类号： G06K7/10 , G02B19/0014 , G02B19/0052 , G02B19/0085 , G02B19/009 , G02B19/0095 , G02B26/10 , G02B27/095 , G02B27/48 , G06K7/10594 , G06K7/10732 , G06K7/146 , G06K9/26 , G06K9/325 , H01S5/005 , H01S5/02248 , H01S5/4025
摘要： A planar laser illumination and imaging (PLIIM) based camera system capable of producing digital images with reduced levels of speckle-pattern noise. The PLIIM based camera system comprises a planar laser illumination array (PLIA) including a plurality of laser diodes for producing and projecting a planar laser illumination beam (PLIB) so as to illuminate an object as it is moving past said PLIIM based camera system. An image formation and detection (IFD) module is provided having a image detection array and imaging forming optics for providing the image detection array with a field of view (FOV). The PLIB and FOV are arranged in a coplanar relationship along the working range of the PLIIM based camera system so that the PLIB illuminates primarily within the FOV of the IFD module. A speckle-pattern noise reduction subsystem is integrated with the IFD, for reducing the temporal-coherence of said planar laser illumination beam (PLIB) after the PLIB has illuminated and reflected/scattered off the target object. The speckle-pattern noise reduction subsystem carries out a temporal intensity modulation technique after the reflection/scattering of the PLIB off the target, so that the laser illumination reflected/scattered off the object consists of temporally coherent-reduced planar laser illumination, causing numerous substantially different time-varying speckle-noise patterns to be produced at the image detection array over the photo-integration time period thereof. The numerous substantially different time-varying speckle-noise patterns are detected at the image detection array over the photo-integration time period, and the detected speckle-noise patterns are temporally averaged at said image detection array during the photo-integration time period thereof. As a result of such temporal averaging, the RMS power of observable speckle-noise patterns is reduced at the image detection array. By virtue of the present invention, it is now possible to enjoy the benefits of laser-based illumination during high-speed imaging operations, without the adverse effects of speckle-pattern noise.

80. 发明授权

US06863216B2 METHOD OF SPECKLE-NOISE PATTERN REDUCTION AND APPARATUS THEREFOR BASED ON REDUCING THE SPATIAL-COHERENCE OF THE PLANAR LASER ILLUMINATION BEAM BEFORE IT ILLUMINATES THE TARGET OBJECT BY APPLYING SPATIAL PHASE MODULATION TECHNIQUES DURING THE TRANSMISSION OF THE PLIB TOWARDS THE TARGET 失效
公开(公告)号：US06863216B2
公开(公告)日：2005-03-08
申请号：US10136612
申请日：2002-04-30
申请人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
发明人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Timothy A. Good , Andrew Jankevics
IPC分类号： G02B6/42 , G02B27/48 , G06C11/08 , G06F17/00 , G06K7/10 , G06K7/14 , G06K9/22 , G07B15/06 , H01S3/00 , H01S3/08 , H01S5/00 , H01S5/022 , H01S5/40
CPC分类号： G06K7/10 , G02B19/0014 , G02B19/0052 , G02B19/0085 , G02B19/009 , G02B19/0095 , G02B26/10 , G02B27/095 , G02B27/48 , G06K7/10594 , G06K7/10732 , G06K7/146 , G06K9/26 , G06K9/325 , H01S5/005 , H01S5/02248 , H01S5/4025
摘要： A planar laser illumination and imaging (PLIIM) based camera system capable of producing digital images with reduced levels of speckle-pattern noise. The PLIIM based camera system comprises a planar laser illumination array (PLIA) including a plurality of laser diodes for producing and projecting a planar laser illumination beam (PLIB) through said first light transmission aperture, so as to illuminate an object as it is moving past said PLIIM based camera system. An image formation and detection (IFD) module is provided having a image detection array and imaging forming optics for providing said image detection array with a field of view (FOV). The PLIB and FOV are arranged in a coplanar relationship along the working range of the PLIIM based camera system so that the PLIB illuminates primarily within the FOV of the IFD module. A speckle-pattern noise reduction subsystem is integrated with the PLIA, for reducing the spatial-coherence of said planar laser illumination beam (PLIB) before the PLIB illuminates a target object. The speckle-pattern noise reduction subsystem carries out a spatial phase modulation technique during the transmission of the PLIB towards the target, so that the object is illuminated with a spatially coherent-reduced planar laser illumination beam (PLIB) and numerous substantially different time-varying speckle-noise patterns are produced at the image detection array over the photo-integration time period thereof. The numerous substantially different time-varying speckle-noise patterns are detected at the image detection array over the photo-integration time period, and the detected speckle-noise patterns are temporally averaged at said image detection array during the photo-integration time period thereof. As a result of such temporal averaging, the RMS power of observable speckle-noise patterns is reduced at the image detection array. By virtue of the present invention, it is now possible to enjoy the benefits of laser-based illumination during high-speed imaging operations, without the adverse effects of speckle-pattern noise.

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