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1.发明授权Linear integrating cavity light source for infra-red illumination of sensitized media 失效线性积分腔光源，用于敏化介质的红外照明
公开(公告)号：US5548120A
公开(公告)日：1996-08-20
申请号：US339052
申请日：1994-11-14
CPC分类号： G01N21/8916 , G01N21/8901 , G01N2021/8908
摘要： A highly uniform infrared illumination source for illuminating a stripe of a moving sensitized web for line scan imaging of imperfections in the coating on the web by a CCD imaging camera. A light integrator having an elongated housing formed with side and end walls defines a linear light integrating cavity having diffusely reflecting interior wall surfaces. An elongated array of infrared LEDs is spaced along the side wall for emitting light into the cavity for integration within the cavity. A longitudinally extending slit is formed in the side wall through which a diffuse, linear light beam exits the elongated slit having a varying longitudinal intensity profile. The intensity of the light emitted by the LEDs is modulated in an intensity pattern that alters the varying longitudinal intensity profile of the linear light beam to provide a desired longitudinal intensity profile of the stripe of diffuse illumination. Preferably, the intensity modulation renders more uniform the longitudinal intensity profile of the linear light beam illuminating the web as viewed by the imaging camera. The desired light intensity profile along the length of the emitted light beam is achieved by clustering the LEDs with LED drive circuits operated at different drive currents as a function of a set point control signal appropriate to the characteristics of the imaging camera and a transmitted light intensity feedback signal to maintain the intensity pattern of the LEDs and the uniform intensity profile as viewed by the imaging camera regardless of the optical density of the web.
摘要翻译： 一种高度均匀的红外照明光源，用于照射移动敏化纤维网的条纹，用于通过CCD成像相机对卷材上的涂层中的缺陷进行线扫描成像。 具有形成有侧壁和端壁的细长壳体的光积分器限定具有漫反射内壁表面的线性光积分腔。 红外LED的细长阵列沿着侧壁间隔开，用于将光发射到空腔中以在腔内积分。 在侧壁中形成纵向延伸的狭缝，通过该侧壁，漫射的线性光束通过该狭缝从具有变化的纵向强度分布的细长狭缝离开。 由LED发射的光的强度以改变线性光束的变化的纵向强度分布的强度图案调制，以提供漫射照明条的期望的纵向强度分布。 优选地，强度调制使由成像照相机观察到的照射纤维网的线性光束的纵向强度分布更均匀。 沿着发射光束的长度的期望的光强度分布通过将LED与以不同驱动电流操作的LED驱动电路聚类来实现，该LED驱动电路作为适合于成像相机的特性的设定点控制信号和透射光强度 反馈信号以维持LED的强度图案和由成像摄像机观察的均匀强度分布，而与幅材的光密度无关。
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公开(公告)号：US5533139A
公开(公告)日：1996-07-02
申请号：US304603
申请日：1994-09-12
CPC分类号： G01N21/8422 , G01N21/89 , G01N21/8903 , H04N3/1525 , G01N2021/0168 , G01N2021/8427 , G01N2021/8838 , G01N2021/8887 , G01N2021/936 , G01N2201/102
摘要： An image processor based system and method are provided for recognizing predefined-types of coating density imperfections in a web. Specific imperfection-types to be analyzed include continuous-type, as well as point-type, anomalies. Continuous-type imperfections are recognized in a moving continuous web through the accumulation and integration of density data on the web passing through a system imaging area. Depending upon the type of imperfection to be imaged, the light source provides either constant illumination or strobed illumination of the moving coated web. For most types of imperfections, transmissive illumination of the web is used, however, for point-type anomalies reflective illumination is possible, particularly if the web is static. A machine vision image processor contains predefined lookup tables which allow adaptive control of web illumination within the imaging area. An integrating sphere is used to provide for uniform web illumination. Corresponding machine vision based imperfection recognition processing routines are also described.
摘要翻译： 提供了基于图像处理器的系统和方法，用于识别网中预定类型的涂层密度缺陷。 要分析的具体缺陷类型包括连续型，以及点型异常。 连续型缺陷可以通过在通过系统成像区域的网络上的密度数据的累积和整合来识别移动的连续网页。 根据要成像的缺陷的类型，光源可提供移动的涂覆幅材的恒定照明或选通照明。 对于大多数类型的缺陷，使用幅材的透射照明，然而，对于点型异常，反射照明是可能的，特别是如果幅材是静态的。 机器视觉图像处理器包含预定义的查找表，其允许对成像区域内的网络照明的自适应控制。 积分球用于提供均匀的网状照明。 还描述了基于机器视觉的不完备识别处理程序。
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3.发明授权
公开(公告)号：US5668887A
公开(公告)日：1997-09-16
申请号：US425640
申请日：1995-04-20
IPC分类号： G01N21/01 , G01N21/89 , G01N21/892 , G01N21/93 , G01N21/95 , H04N1/00 , H04N5/372 , H04N7/18 , G01N21/00
CPC分类号： H04N5/37206 , G01N21/8422 , G01N21/89 , G01N21/8903 , H04N3/1525 , G01N2021/0168 , G01N2021/8427 , G01N2021/8838 , G01N2021/8887 , G01N2021/936 , G01N2201/102
摘要： An image processor based system and method for recognizing predefined-types of coating density imperfections in a web, specifically continuous type or streak imperfections. Continuous type imperfections are recognized in a continuous web moved at a certain rate through an imaging region illuminated by a stripe of substantially constant illumination. A time-delay integrating CCD camera is focused on the illuminated imaging region. The TDI CCD camera comprises an array of N rows of M light sensitive CCD elements each imaged on a fixed discrete pixel-related image area of the illuminated imaging region. The charge levels accumulated in the CCD elements of each row are shifted to the succeeding row or CCD elements and summed with the charge levels therein at a line shift clock frequency that ensures that an asynchronous relationship exists with respect to the incremental movement of the web. During the clock cycle of the N rows, the corresponding pixel areas of the illuminated web shift asynchronously or creep through the discrete pixel-related image areas. The accumulated pixel charge values derived from the pixel-related image areas of the illuminated region of said moving web emphasize imaging of longitudinal streak imperfections in the web due to the asynchronous movement the web.
摘要翻译： 一种基于图像处理器的系统和方法，用于识别网中预定类型的涂层密度缺陷，特别是连续类型或条纹缺陷。 通过由基本上恒定的照明条纹照射的成像区域以一定的速率移动的连续幅材中识别出连续型缺陷。 集成CCD相机的延时集中在照明成像区域。 TDI CCD摄像机包括N行M个光敏CCD元件的阵列，每个成像在照明成像区域的固定离散像素相关图像区域上。 累积在每行的CCD元件中的电荷电平被移动到后面的行或CCD元件，并且以线移位时钟频率与其中的电荷电平相加，以确保相对于幅的增量移动存在异步关系。 在N行的时钟周期期间，被照射的web的相应的像素区域异步地移动或者通过离散的像素相关的图像区域来移动。 从所述移动幅材的被照射区域的像素相关图像区域导出的累积的像素电荷值强调了由于网状物的异步移动而在幅材中的纵向条纹缺陷的成像。
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