Some light sources are flickering lights, such as fluorescent lights. Human eyes may not notice it but cameras can notice it. It may cause flickering or rolling artifacts on the video. Use anti-flickering option to match the lighting condition of the scene to avoid these artifacts.
Camera is an imaging sensor that collects the light and converts the light signals into images. And different light sources have different light spectrum, which changes the reflected lights on the object. So the same object may look like it has different colors depending on its light source. In most cases, automatic white balance works good enough. But if it does not, use the white balance to match the light profile closest to the light condition. Sometimes it is called color temperature adjustment.
External SATA (eSATA) connector is used to connect additional external storage to the NVR. Mega pixel requires more storage, and you can never have enough storage. eSATA storage boxes come in different fashions and configurations. Sometimes it comes with RAID or mirroring option, where you need to pre-configure the eSATA storage box before you connect to the NVR. Not all eSATA storage controller chipsets are compatible with NVR. Please refer to the approved eSATA storage boxes, and IDIS provides an rack mountable eSATA storage for the NVR.
It monitors if the NVR has been recording at least once during the specified duration. If not, you can have your NVR notifiy you of the condition. Maybe the recording schedule has changed, and it is not recording properly as you intended it.
It monitors if an alarm input has been triggered at least once during the specified duration. If it is a door, it is safe to assume that the door will be open at least once a day. If this was not detected, maybe the sensor is bad or sensor wiring is bad. You can have your NVR notify this condition so that you can send a technician to take a look.
Self-Monitoring, Analysis and Reporting Technology. HDD it does have a brain. It keeps monitoring its operating condition and gathers statistics. NVR can read this information such as highest temperatures the HDD reached. This information can be used to adjust the installation environment to a more friendly one for the operation of NVR.
It is a feature of DirectIP camera. User defines a line in the scene, where the line is being monitored to detect an object crossing the line one way or the other way or both. It can be used to trigger an event condition.
It is a feature of DIP camera. User defines an area in the scene, where the area is being monitored to detect an object that crosses the zone inward or outward. It can be used to trigger an event condition.
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.
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.
It is the hole on the iris of the lens specified in F stop number of the lens. The bigger the hole is the more light can pass, the lower F number, but the shallower the field of depth. The smaller the hole is the other way around.