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51. 发明授权

US06953152B2 HAND-SUPPORTABLE PLANAR LASER ILLUMINATION AND IMAGING (PLIIM) BASED CAMERA SYSTEM CAPABLE OF PRODUCING DIGITAL LINEAR IMAGES OF A OBJECT, CONTAINING PIXELS HAVING A SUBSTANTIALLY UNIFORM WHITE LEVEL INDEPENDENT OF THE VELOCITY OF THE OBJECT WHILE MANUALLY MOVING SAID FILM BASED CAMERA SYSTEM PAST SAID OBJECT DURING ILLUMINATION IMAGING OPERATIONS 失效
公开(公告)号：US06953152B2
公开(公告)日：2005-10-11
申请号：US10151743
申请日：2002-05-17
申请人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Michael D. Schnee , Ka Man Au , Sankar Ghosh
发明人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Michael D. Schnee , Ka Man Au , Sankar Ghosh
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 hand-supportable planar laser illumination and imaging (PLIIM) based camera system for producing digital linear images of a object within a working range, having a substantially uniform white level independent of the velocity of the object. The hand-supportable PLIIM based camera system comprises a PLIIM based imaging system having a linear image detection array with a field of view (FOV), a planar laser illumination array (PLIA) with a plurality of laser diodes arranged in a linear array for producing a planar laser illumination beam (PLIB) coplanar with the FOV, and a micro-controller for controlling the operation of the PLIIM based imaging system. An object velocity measurement subsystem is mounted within its hand-supportable housing, for determining the velocity of the object relative to the hand-supportable housing and generating object velocity data indicative of the determined velocity of the object. During object illumination and imaging operations, the micro-controller uses the object velocity data compute the optical power which each laser diode must produce in order that each digital image of the object, formed by illuminating the object with the computed optical power, will have substantially the same white intensity level independent of the velocity of the object relative to the PLIIM-based imaging system. The computed optical power value(s) are transmitted to the micro-controller, and the micro-controller uses the computed optical power value(s) to drive each laser diode so that it produces a planar laser illumination beam having the computed optical power level with the FOV. By virtue of the present invention, the planar laser illumination beam illuminates the object, and the PLIIM-based imaging system automatically produces a digital image of the moving object, with pixels having a substantially uniform white level, independent of the velocity of the object. Such image characteristics enables simpler and more reliable image processing in applications such as, for example, optical character recognition (OCR) processing, where image pixels having a substantially uniform white level, and a uniform aspect-ratio, are often desired or required.

52. 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。

53. 发明授权

US06988660B2 Planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of moving 3-D objects 失效
公开(公告)号：US06988660B2
公开(公告)日：2006-01-24
申请号：US10084764
申请日：2002-02-26
申请人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Pirooz Vatan
发明人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Pirooz Vatan
IPC分类号： G06K7/10 , G06K7/14
CPC分类号： G06K7/10 , G06K9/26 , G06K9/325 , H01S5/005 , H01S5/02248 , H01S5/4025
摘要： A planar laser illumination and imaging (PLIIM) based camera system for producing high-resolution 3-D images of moving 3-D objects having arbitrary surface geometry. The PLIIM-based camera system comprises a system housing of unitary construction, a LADAR-based object profiling subsystem, a PLIIM-based linear imaging subsystem, and an image processing subsystem disposed therein. The system housing has first, second, third and fourth light transmission apertures linearly aligned with and optically isolated from each other, and the third light transmission aperture is disposed between the first and second light transmission aperture. The LADAR-based object profiling subsystem projects an amplitude modulated (AM) laser beam through the fourth light transmission aperture, and scans the laser beam across an 3-D object surface of arbitrary surface geometry moving past the fourth light transmission aperture. The return AM laser beam is processed in order to measure the surface profile of the moving 3-D object surface and produce a series of linear 3-D surface profile maps thereof. Each linear 3-D surface profile map comprises a set of 3-D coordinates specifying the location of sampled points along the moving 3-D object surface. The PLIIM-based linear imaging subsystem produces a series of linear high-resolution 2-D images of the moving 3-D object surface. Each linear high-resolution 3-D image comprises a set of pixel intensity values, and each pixel intensity value is assigned a set of two-dimensional coordinates specifying the location of the pixel in the linear high-resolution 2-D image. The image processing subsystem automatically processes the linear 3-D surface profile maps and the high-resolution 2-D linear images captured by the subsystems in order to construct high-resolution 3-D images of the 3-D object surface. By virtue of the present invention, it is now possible to produce high-resolution 3-D images of moving 3-D object surfaces using linear imaging and 3-D profiling techniques.

54. 发明授权

US06971576B2 GENERALIZED METHOD OF SPECKLE-NOISE PATTERN REDUCTION AND PARTICULAR FORMS OF APPARATUS THEREFOR BASED ON REDUCING THE SPATIAL-COHERENCE OF THE PLANAR LASER ILLUMINATION BEAM AFTER IT ILLUMINATES THE TARGET BY APPLYING SPATIAL INTENSITY MODULATION TECHNIQUES DURING THE DETECTION OF THE REFLECTED/SCATTERED PLIB 失效
公开(公告)号：US06971576B2
公开(公告)日：2005-12-06
申请号：US10136028
申请日：2002-04-30
申请人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Andrew Jankevics , Timothy A. Good
发明人： Constantine J. Tsikos , C. Harry Knowles , Allan Wirth , Andrew Jankevics , Timothy A. Good
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 spatial-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 spatial 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 spatially 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.

55. 发明授权

US06957775B2 INTERNET-BASED METHOD OF AND SYSTEM FOR REMOTELY MONITORING, CONFIGURING AND SERVICING PLANAR LASER ILLUMINATION AND IMAGING (PLIIM) BASED NETWORKS WITH NODES FOR SUPPORTING OBJECT IDENTIFICATION AND ATTRIBUTE INFORMATION ACQUISITION FUNCTIONS 失效
标题翻译：基于互联网的远程监控，配置和维护平面激光照明和成像（PLIIM）网络的方法和系统，支持对象识别和属性信息获取功能的节点
公开(公告)号：US06957775B2
公开(公告)日：2005-10-25
申请号：US10135893
申请日：2002-04-29
申请人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Ka Man Au , Barry E. Schwartz
发明人： Constantine J. Tsikos , C. Harry Knowles , Xiaoxun Zhu , Ka Man Au , Barry E. Schwartz
IPC分类号： G06K7/10 , G06Q10/00 , G06Q30/00
CPC分类号： G06Q10/00 , G06K7/10722 , G06K7/10732 , G06Q30/00
摘要： An Internet-based method of and system for monitoring, configuring and servicing planar laser illumination and imaging (PLIIM) based network remotely situated from and using any Internet-enabled client computing subsystem functioning as the network management station (NMS). The PLIIM based network (i) has a plurality of nodes, (ii) is operably interconnected to the infrastructure of the Internet, (iii) has set of parameters related to network, system and/or subsystem characteristics of said PLIIM-based network, and (iv) is capable of performing a predefined set of object identification and attribute acquisition functions in a network environment. The method comprising using the NMS to remotely monitor the set of parameters related to network, system and/or subsystem characteristics of the PLIIM-based network. The NMS, its supporting client machine, and/or remote servers supporting servlets, analyze the monitored parameters so as to diagnose either actual or potential performance failures in the PLIIM-based network which might prevent the performance of one or more of the predefined set of object identification and attribute acquisition functions. By virtue of the present invention, it is now possible to remotely monitor, configure and service Internet-based PLIIM-based networks simply using any Internet-enabled browser, thereby keeping such networks up and running, with minimal down-time.
摘要翻译：一种基于互联网的方法和系统，用于监控，配置和维护基于平面激光照明和成像（PLIIM）的网络，远程位于使用任何启用网络的客户端计算子系统作为网络管理站（NMS）。基于PLIIM的网络（i）具有多个节点，（ii）可操作地连接到因特网的基础设施，（iii）具有与所述基于PLIIM的网络的网络，系统和/或子系统特性相关的一组参数，和（iv）能够在网络环境中执行预定义的一组对象识别和属性获取功能。该方法包括使用NMS远程监视与基于PLIIM的网络的网络，系统和/或子系统特性相关的参数集合。 NMS，其支持的客户端机器和/或支持servlet的远程服务器分析所监视的参数，以便诊断基于PLIIM的网络中的实际或潜在性能故障，这可能会阻止一个或多个预定义的组对象识别和属性获取功能。凭借本发明，现在可以简单地使用任何启用了因特网的浏览器来远程监视，配置和服务基于互联网的基于PLIIM的网络，从而以最小的停机时间来保持这种网络的正常运行。

56. 发明授权

US4979815A Laser range imaging system based on projective geometry 失效
标题翻译：基于投影几何的激光测距成像系统
公开(公告)号：US4979815A
公开(公告)日：1990-12-25
申请号：US312635
申请日：1989-02-17
申请人： Constantine J. Tsikos
发明人： Constantine J. Tsikos
IPC分类号： G01B11/25
CPC分类号： G06K9/209 , G01B11/2522
摘要： A range imaging system, and a method for calibrating such a system are based on the principles of projective geometry. The system comprises four subsystems: (1) a laser and a cylindrical lens or vibrating mirror for producing a planar beam of light; (2) an electronic camera equipped with a lens and an appropriate interference filter; (3) an electronic circuit for height (depth) measurements and video image generation; and (4) a scanning mechanism for moving the object with respect to the light beam and the camera so as to scan an area of the object surface. The system is calibrated by determining the position in the electronic image of the object surface at three different heights. The range image is generated from these three known heights from either a previously determined look-up table, or from a calculation based on the invariance of the cross-ratio, a well known ratio from projective geometry.
摘要翻译：范围成像系统和校准这种系统的方法基于投影几何的原理。该系统包括四个子系统：（1）激光器和用于产生平面光束的柱面透镜或振镜; （2）配备有透镜和适当的干涉滤光器的电子照相机; （3）用于高度（深度）测量和视频图像生成的电子电路; 和（4）用于相对于光束和相机移动物体以扫描物体表面的区域的扫描机构。通过在三个不同的高度确定物体表面的电子图像中的位置校准该系统。范围图像从先前确定的查找表的三个已知高度或基于交叉比的不变性的计算产生，这是从投射几何学的众所周知的比例。

57. 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。

58. 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。

59. 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.

60. 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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