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。