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公开(公告)号：US4975864A
公开(公告)日：1990-12-04
申请号：US302534
申请日：1989-01-26
CPC分类号： H04N5/33 , H04N5/3656
摘要： Apparatus and methods for providing nonuniformity compensation of staring infrared focal plane array imaging systems, or other video imaging ssytem, or the like. The invention comprises a processor which implements nonuniformity compensation of the detectors comprising the array. The processor generates compensation terms that are stored in an offset term memory and which are subsequently combined with the output signals from the array. The processing accomplished by the present invention normalizes all detector elements in the array such that they all appear to respond to infrared energy in an identical manner. The processor comprises a median filter which selectively implements cross (X) shaped and plus (+) shaped filters. An antimedian calculator computes the antimedian of the output of the median filter. This value comprises the difference between the central pixel of a respective filter and the median value of all pixels in the cross (X) or plus (+) shaped filter. A third filter samples each of the signals from the detector array and compares them to a preset value indicative of an anticipated scene intensity level determined by the operator to provide an output signal indicative of the difference. Control circuity selects which output signal of the filter circuits is to be used to compensate the detector signals during a particlar video field. The ouptut signals of the antimedian calculator and average filter comprise sign information which is indicative whether the central pixel value is less than, equal to or greater than the median, or whether the central pixel is less than, equal to or greater than the preset value, respectively. The control circuitry increments or decrements the value of the offset terms stored in the offset term memory in resonse to the signal provided by the selected antimedian calculator or third filter, and convergence rate information supplied by the control circuitry which controls the rate of convergence of the offset terms toward the scene average.
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2.发明授权Thermal imaging device with scanned light emitting diodes (LEDs) having variable width geometry and interlacing 失效具有扫描的发光二极管（LED）的热成像装置具有可变的宽度几何形状和隔行扫描
公开(公告)号：US5623146A
公开(公告)日：1997-04-22
申请号：US569679
申请日：1995-12-08
摘要： A thermal imaging device (10) includes a detector (50) having a linearly-arrayed plurality of spaced apart detector elements (50') upon which portions of a viewed scene are sequentially scanned by a scanner (22) in order to capture image information from the scene. A display device (22, 62, 66) similarly includes a first linear array of plural spaced apart light emitting diodes (LEDs) (62') which provide light scanned by the same scanner (22) to a user of the thermal imaging device (10) to provide an image replicating the viewed scene. The LEDs (62') of the display (22, 62, 66) are configured so that sequential portions of the image are interlaced and partially overlapped by the scanner (22) to provide a flat visual field which is free of raster lines. The display device (22, 62, 66) includes a second linearly-arrayed plurality of symbology LEDs (198) which are configured and positioned relative to the first plurality of LEDs (62') so that light from these LEDs is interlaced but not overlapped and so that symbology imagery presented by the second plurality of LEDs (198) is superimposed on the scene image presented to the user of the thermal imaging device (10).
摘要翻译： 热成像装置（10）包括具有线性排列的多个间隔开的检测器元件（50'）的检测器（50），所述检测器元件（50'）通过扫描仪（22）依次扫描观看场景的部分，以便捕获图像信息 从现场。 显示装置（22,62,66）类似地包括多个间隔开的发光二极管（LED）（62'）的第一线性阵列，其将相同扫描器（22）扫描的光提供给热成像装置的用户 10）提供复制观看场景的图像。 显示器（22,62,66）的LED（62'）被配置为使得图像的顺序部分被扫描器（22）隔行扫描并部分地重叠，以提供没有光栅线的平坦视野。 显示装置（22,62,66）包括第二直线排列的多个符号系统LED（198），其被配置和相对于第一多个LED（62'）定位，使得来自这些LED的光交错但不重叠 并且使得由第二多个LED（198）呈现的符号图像叠加在呈现给热成像装置（10）的用户的场景图像上。
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