公开(公告)号：EP0779770A1

公开(公告)日：1997-06-18

申请号：EP96308945.3

申请日：1996-12-10

申请人： GENERAL ELECTRIC COMPANY

发明人： Relihan, Gary Francis ,  Roehm, Steven Philip ,  Mangalik, Ruchi

IPC分类号： H05G1/36 ,  H05G1/60 ,  H04N5/321

CPC分类号： H04N5/32 ,  H05G1/36 ,  H05G1/60

摘要： An x-ray imaging system (40) includes a source of x-rays (42), a video camera (52) which produces an image signal formed by x-ray attenuation values, an image signal processor (72) and a video monitor (74) for displaying the x-ray image. The system also has an automatic image control (56) that includes a peak detector (60), an average brightness detector (58) and a transfer function generator (62) for the image processor. The peak detector (60) receives the image signal and produces a video gain control signal for controlling the video camera in response to a comparison of a peak level of the image signal to a peak reference level. The average brightness detector (58) employs the image signal to produce a feedback signal (66) which controls by the source of x-rays. The transfer function generator (62) produces a histogram of intensity levels in the image signal which histogram forms a look-up table (76) that is used by the image processor to transform the image signal into the adjusted image signal for display.

摘要翻译： 一种X射线成像系统（40）包括X射线源（42），摄像机（52），它产生由x射线衰减值，图像信号处理器（72）形成的图像信号和视频显示器 （74），用于显示所述X射线图像。 因此，该系统具有自动图象控制（56）没有包括关于平均亮度检测器（58）和用于图像处理器的传递函数发生器（62）的峰值检测器（60）。 峰值检测器（60）接收图像信号，并产生一个视频增益控制信号，用于响应于图像信号的峰值电平的至峰值基准电平的比较控制所述视频摄像机。 平均亮度检测器（58）采用的图像信号，以产生通过X射线源控制的反馈信号（66）。 传递函数发生器（62）产生的图像信号中的强度水平哪直方图查找表（76）那样，使用由图像处理器将所述图像信号变换成用于显示调整后的图像信号形式的直方图。