7. Why there are some circles’ images on targets cannot be seen on the screen?
* : 2015-08-17 * : 80
1) Check the targets to make sure their surfaces are clean.
2) When installing targets, the angle may be incorrect.
3) Targets may be blocked by something.
4) Targets are close the boundary or out of the monitoring range of cameras.
5) Images on the screen are too bright or too dark to be seen.
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