公开(公告)号：US3777169A

公开(公告)日：1973-12-04

申请号：US3777169D

申请日：1972-01-26

Applicant: EMHART CORP

Inventor： WALTER W ,  MESNIK R

IPC: G01N21/90 ,  G01N33/00 ,  G06M7/00 ,  H04N7/00

CPC classification number: G01N21/9027 ,  G01N21/8851 ,  G01N21/93 ,  G01N2033/0081

Abstract: A liquid filled transparent container is spun momentarily and successive video frames are then taken by a camera while the liquid swirls in the stationary container. One or more of these video frames can be stored in memory in digitized form. Two or more digitized video frames are then compared electronically, by ''''subtracting'''' one from the other, to generate a reject signal when the ''''difference'''' exceeds some preset number of digitized pulses. The threshold voltage for the video frame being generated can be altered by reference to a stored video frame in order to increase the sensitivity of that frame at discrete points corresponding to voltages exceeding the threshold voltage in the stored frame and desensitized at all other points to reduce the likelihood of spurious signals.

Abstract translation: 液体填充的透明容器旋转瞬间，然后连续的视频帧由相机拍摄，同时液体在固定容器中旋转。 这些视频帧中的一个或多个可以以数字形式存储在存储器中。 然后将两个或多个数字化的视频帧通过“从另一个”中减去一个来电子地进行比较，以在“差”超过预设数量的数字化脉冲时产生拒绝信号。 正在生成的视频帧的阈值电压可以通过参考所存储的视频帧来改变，以增加对应于超过存储帧中的阈值电压的电压的离散点处的该帧的灵敏度，并且在所有其它点处减弱 杂散信号的可能性。

公开(公告)号：US3818127A

公开(公告)日：1974-06-18

申请号：US32837573

申请日：1973-01-31

Applicant: EMHART CORP

Inventor： WALTER W

IPC: G01N21/90 ,  G01N33/00 ,  H04N5/18 ,  H04N7/18

CPC classification number: G01N21/9027 ,  G01N2033/0081

Abstract: A liquid filled transparent container is spun momentarily, and successive video voltage patterns or frames are generated by a video camera while the liquid and any particles to be detected are still swirling, and the container is held stationary. Prior to digitizing the voltage peaks in each of these video frames so that they can be electronically compared one frame to another, the video output of the camera is processed to stabilize the pedestal or base voltage which represents the ''''black level'''' in the video voltage patterns representing the successive frames. The voltage peaks are then compared to a threshold voltage and digital voltage peaks generated whenever this threshold value is exceeded as measured with respect to the pedestal or base line voltage. Circuitry is described for continuously amplifying the video signal, for synchronously clamping it, and for stabilizing the present pedestal voltage by horizontally blanking the resulting signal, and by inverting and blanking the signal once again to achieve a low signal level which is then continuously fed back to the black level control for stabilizing the pedestal voltage at a level which does not vary within each scan line of each video frame as is characteristic of conventional video frame base line voltages.

Abstract translation: 液体填充的透明容器瞬间旋转，并且在液体和待检测的任何颗粒仍在旋转的同时，摄像机产生连续的视频电压图案或帧，并且容器保持静止。 在将这些视频帧中的每一个中的电压峰值数字化之前，可以将它们电子地比较一帧到另一帧，摄像机的视频输出被处理以稳定基座或基极电压，这表示视频电压中的“黑电平” 表示连续帧的图案。 然后将电压峰值与阈值电压和数字电压峰值进行比较，每当该阈值超过基准线或基线电压时测量。 描述了用于连续放大视频信号以同步钳位电路的电路，并且通过水平消隐所得信号来稳定当前的基座电压，并且再一次反转和消隐信号以实现低信号电平，然后将其连续反馈 到黑电平控制，以将基座电压稳定在每个视频帧的每个扫描线内不变化的水平，如常规视频帧基线电压的特征。