On the basis of the widely application of surveillance cameras and the installation of security monitoring equipment, why are there frequent incidents of theft in life. It was known that it was because the monitoring had a dead angle after the investigation. The thief deliberately avoided the surveillance area and entered the surveillance blind zone for theft. But the Cctv Camera did not monitor the theft. So when people face a variety of complex environments and the monitoring device has a dead angle, is there any way to avoid risks?