| 摘要 |
PURPOSE:To make it possible to surely detect the movement of an object to be monitored, by a method wherein a spot shaped marker due to laser beam is applied to the proper area of the object to be monitored and the position information and brightness information of the marker are detected on the basis of the output of an image input means for picking up the image of the object to be monitored arranged to a position different from a laser beam generating means. CONSTITUTION:A part of an object to be monitored 2 is irradiated with laser beam and a spot shaped marker 6 is applied to the object 2. When the object 2 is moved, the position coordinates of the marker 6 moves to the position coordinates of a marker 6'. The marker 6 will sometimes get out of a monitor region with the movement of the object 2 according to the shape of the monitor region. Therefore, by comparing the position of the marker 6 in each frame taking-in the output of an image input means 3 with the position of the marker in the frame immediately before said frame in a judging means 4, the positional change of the marker 6 is detected to make it possible to detect the movement of the object 2. If the change in brightness is detected, the movement of the object 2 can be detected by the presence or absence of the marker 6 in the monitor region.
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