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There are two different alarm inputs on NVR: camera alarm in, and NVR alarm in. They all work as if they are all on the NVR. This is very useful, because in most cases, alarm sensors or actuators are closer to the camera. All these camera alarm IOs are managed as if they are on the NVR, and you don't have to run the wires all the way to the back of the NVR.
Most events are generated by external sensors, such as VMD(Video Motion Detection), Video Loss, etc. System events are generated by the NVR, which are related to critical system status such as HDD condition. These events can be used to send out a specified notification to a specific operator. For example, when the HDD starts to detect bad sectors, you can have your NVR to send out an email notification so that you can take the cautionary action to save the data before the HDD fails completely.
[S]Summary email notification
A feature of NVR, NVR monitors its cameras or alarm status over a specified intervals, and if some conditions are met, it summaries these status information, and sends out an email notification. It is useful to avoid receiving too many emails in your inbox, while keeping the peace of your mind knowing that the NVRs are hard at work.
Sometimes called callback. It is a feature of NVR that the NVR notifies the operator for a pre-programmed conditions. There are many different notification methods: callback to iRAS, push notification to smart phone remote applications, or email notifications.
Remote application used to connect to NVR for watching live video or playing recorded video. There are many different Remote apps running on different platforms, such as Windows PC, Mac OS X(??), iOS or Android devices. Features maybe different from one another.
Multiple exposures is done for each pixel during 1/30 seconds, and the they are saved in a frame buffer to be processed to produce wide dynamic range pictures which shows over/under exposed area details. There is a slight difference of the time when these multiple exposures were sampled causing some artifacts for fast moving objects causing blurring. But over all, these artifacts are not very serious when the scene requires a wider dynamic range like an office camera facing the office window, or supermarket entrance door where strong back light is expected during the day time.
Traditional film cameras have a mechanical shutter. Electronic cameras do not have a mechanical shutter, but it can mimic the effect of the mechanical shutter by reading the pixel signal and then resetting the pixel for the next scene. Typically in IP cameras, a rolling shutter is used which reads and resets each pixel in a very fast serial manner. Thus one image is comprised of pixels sampled from ever so slightly different time. There are some artifacts for very fast moving objects.