公开(公告)号：US5471240A

公开(公告)日：1995-11-28

申请号：US152154

申请日：1993-11-15

申请人： Kenneth E. Prager ,  Stephen J. Herbst ,  Jerry N. Sisneros ,  John J. Wootan ,  Douglas M. Gleichman

发明人： Kenneth E. Prager ,  Stephen J. Herbst ,  Jerry N. Sisneros ,  John J. Wootan ,  Douglas M. Gleichman

IPC分类号： G06T1/00 ,  G06T5/20 ,  H04N5/33

CPC分类号： H04N5/3651 ,  H04N5/33 ,  H04N5/3656

摘要： A scene based nonuniformity correction method (40) that computes and applies offset correction errors to a video signal corresponding to an image derived from a imaging sensor (11). A video signal derived from the sensor (11) is processed such that a vector representing offset correction terms is formed, and this vector is initially set to zero. Each element in this vector represents a correction term for a particular detector of the sensor (11). The vector is applied to each pixel of the image by a processor (13) as the pixels are read from the sensor (11). To measure the offset error, the image is separated into vertically oriented regions, each comprising a plurality of channels. The average of each channel within a region is computed (42), and a set of region vectors is foraged, such that there is one region vector for each region. Each region vector is then globally high-pass filtered and then edges larger than a predefined threshold are detected (43), and marked (44). Then, each region vector is further separated into sub-regions (45). The isolated sub-regions are locally high-pass filtered. In one embodiment, the correction terms for each vertical region vector are averaged together, resulting in a single correction vector (48). The correction terms calculated for each vertical region may also be applied individually to each detector of the sensor (11). In this second embodiment, the offset level error in each region for each channel is calculated (49), wherein the offset level error at boundary edges is undefined. The correction terms corresponding to a region are applied as the detector (11) scans the scene and views a portion corresponding to that particular region. The correction terms are smoothed at region boundaries to eliminate noise due to boundary transitions.

摘要翻译： 一种基于场景的非均匀性校正方法（40），该方法对与从成像传感器（11）导出的图像相对应的视频信号计算并应用偏移校正误差。 从传感器（11）导出的视频信号被处理，使得形成表示偏移校正项的矢量，并且该矢量被初始设置为零。 该矢量中的每个元素表示传感器（11）的特定检测器的校正项。 当从传感器（11）读取像素时，由处理器（13）将矢量应用于图像的每个像素。 为了测量偏移误差，将图像分离成垂直取向的区域，每个区域包括多个通道。 计算区域内每个通道的平均值（42），并且对一组区域向量进行计算，使得每个区域都有一个区域向量。 然后对每个区域矢量进行全局高通滤波，然后检测大于预定义阈值的边缘（43）并标记（44）。 然后，将每个区域矢量进一步分成子区域（45）。 隔离的子区域被局部高通滤波。 在一个实施例中，将每个垂直区域矢量的校正项平均在一起，导致单个校正向量（48）。 对于每个垂直区域计算的校正项也可以单独地应用于传感器（11）的每个检测器。 在该第二实施例中，计算每个通道的每个区域中的偏移电平误差（49），其中边界边缘处的偏移电平误差是未定义的。 当检测器（11）扫描场景并且查看对应于该特定区域的部分时，应用对应于区域的校正项。 校正项在区域边界处被平滑以消除由于边界跃迁引起的噪声。

公开(公告)号：US6018162A

公开(公告)日：2000-01-25

申请号：US616145

申请日：1996-03-14

申请人： Stephen J. Herbst ,  Jeffrey E. Orr ,  Weston K. Furukawa

发明人： Stephen J. Herbst ,  Jeffrey E. Orr ,  Weston K. Furukawa

IPC分类号： H04N5/217 ,  H04N5/33 ,  H04N5/365 ,  H04N5/374 ,  H01L25/00 ,  G02B26/10

CPC分类号： H04N5/3743 ,  H04N5/365 ,  H04N5/33

摘要： A system for correcting detector array channel signal output level non-uniformities in a thermal imaging system. The non-uniformity correction system includes a target scene detector (27) having an array of detector elements (26a, 26b) responsive to energy from a detected target scene (14) and including a plurality of associated output channels (31, 32). The system includes a memory (62) for storing non-uniformity correction commands and a processor (82) operative to implement the non-uniformity commands in response to detected non-uniformities in the output channels signal. The system also includes a non-uniformity corrector (60) for adjusting the level of the output channels in response to commands from the processor (82).

摘要翻译： 一种用于校正热成像系统中的检测器阵列通道信号输出电平不均匀性的系统。 不均匀性校正系统包括目标场景检测器（27），其具有响应来自检测到的目标场景（14）的能量并且包括多个相关联的输出通道（31,32）的检测器元件阵列（26a，26b）。 该系统包括用于存储非均匀性校正命令的存储器（62）和响应于检测到的输出通道信号中的不均匀性而实现不均匀性命令的处理器（82）。 系统还包括用于响应于来自处理器（82）的命令来调节输出通道的电平的不均匀性校正器（60）。

公开(公告)号：US5663563A

公开(公告)日：1997-09-02

申请号：US603663

申请日：1996-02-20

申请人： Stephen J. Herbst ,  Weston Furukawa

发明人： Stephen J. Herbst ,  Weston Furukawa

IPC分类号： G03B13/32 ,  H04N5/228 ,  H04N5/33 ,  H04N5/372 ,  H04N5/374 ,  G01J5/00

CPC分类号： H04N5/37206 ,  H04N3/1525 ,  H04N3/1562 ,  H04N3/1568 ,  H04N5/33 ,  H04N5/3743

摘要： A system for producing a high quality scene image in a thermal imaging system by electronically compensating for variations in the imaging system imager focal length. The system includes optics (16, 18) for detecting a scene (14), a detector assembly (27) being responsive to energy from the detected scene; and an imager (25) for imaging the energy from the detected scene onto the detector assembly (27). The imager (25) includes a temperature sensor (25b) for sensing imager lens temperature. The detector assembly (27) outputs electric signals in response to the energy from the detected scene at a first clock sample rate. The system further includes a processor (84) for controlling the first clock sample rate of the detector assembly to maximize detected scene image quality through variation of the first clock sample rate to automatically compensate for imager lens focal length variation due to ambient temperature changes in the imager lens (25a) and due to inherent manufacturing tolerances.

摘要翻译： 一种用于通过电子补偿成像系统成像器焦距中的变化来在热成像系统中产生高质量场景图像的系统。 该系统包括用于检测场景（14）的光学器件（16,18），响应来自所检测场景的能量的检测器组件（27）; 以及用于将来自检测到的场景的能量成像到检测器组件（27）上的成像器（25）。 成像器（25）包括用于感测成像器透镜温度的温度传感器（25b）。 检测器组件（27）响应于来自检测到的场景的能量以第一时钟采样率输出电信号。 该系统还包括处理器（84），用于通过改变第一时钟采样率来控制检测器组件的第一时钟采样率以使检测到的场景图像质量最大化，以自动补偿由于在第一时钟采样率 成像器镜头（25a）和由于固有的制造公差。