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由于国内各大医院配备影响增强器的X射线闭路电视设备日益增多,本文打算就其与一般闭路电视不同的圆消隐问题做一介绍。因为影像增强器的图像输出为圆形屏,而电视系统的摄像与显示均为矩形屏,为提高图像质量的光阑补偿,自动增益控制,以及圆切割都要用到圆消隐信号。我们知道在(x,y)平面上的圆方程为: (x-a)~2+(y-b)~2=R~2(d,b)为圆心座标,R为圆半径。但是对圆消隐——把圆以外的信号匿影掉,应是:
Due to the increasing number of X-ray CCTV equipment deployed in major hospitals in China, this article intends to make an introduction on the issue of circular blanking which is different from that of CCTV in general. Because the image intensifier’s image output is a circular screen, while the television system displays and displays a rectangular screen, aperture compensation, automatic gain control, and circular cutting for improved image quality all require a round blanking signal. We know that the circular equations on the (x, y) plane are: (x-a) ~ 2 + (y-b) ~ 2 = R ~ 2 (d, b) is the center of the circle and R is the radius of the circle. But for the round blanking - the signal outside the circle out of the shadow should be: