ABNORMALITY DETECTION METHOD, NETWORK VIDEO RECORDER (NVR) AND VIDEO SERVER
FIG5 is a schematic structural diagram of an NVR according to an embodiment of the present application
In order to achieve the above technical object, an embodiment of the present application further provides an NVR, which is applicable to a video surveillance system comprising a video server, the NVR, and a front-end device, as shown in FIG5, the NVR comprising:
schematic structural diagram
620
extraction module
640
anda judgment module
630
generation module
610
storage module
510
receiving module
520
anda sending module
['13. A network video recorder (NVR), which is applicable to a video surveillance system comprising a video server, the NVR, and a front-end device,  characterized in that  the NVR comprises: a receiving module configured to receive first keep-alive information from the front-end device, wherein the first keep-alive information carries first verification information, and the first verification information is  generated according to processes run by the front-end device when sending the first keep-alive information; and a sending module configured to send the first verification information to the video server with the first verification information carried in second keep-alive information, so that the video server determines, according to the first verification information and second verification information on the front-end device, whether an abnormality has occurred in the front-end device, wherein the second verification information is generated according to a process running on the front-end device in a normal running status.', '15. A video server, which is applicable to a video surveillance system comprising a network video recorder (NVR), the video server, and a front-end device,  characterized in that  a corresponding relation between an ID, device feature information, and second process feature information on the front-end device is stored in the video server, the video server comprising: an extraction module configured to extract, when second keep-alive information from the NVR is received, the ID and first verification information carried in the second keep-alive information, wherein the first verification information is generated according to processes run by the front-end device when sending the first keep-alive information; a generation module configured to generate the second verification information by using the device feature information and the second process feature information corresponding to the ID; and a judgment module configured to judge whether the first verification information matches the second verification information, and confirming that the front-end device is running normally when the judgment result is  yes, and confirming that an abnormality has occurred in the front-end device when the judgment result is no.', '16. The video server according to claim 15 further comprising: a storage module configured to pre-store a corresponding relation between the ID, the device feature information, and the second process feature information on the front-end device in the video server, wherein the second process feature information is corresponding to processes running on the front-end device in a normal running status, and the device feature information is corresponding to device information on the front-end device.']