Another major benefit of using an NVR over a DVR is that the IP cameras are loaded with helpful surveillance features that analog cameras will never have. Both systems are able to perform motion detection, but NVRs take it a few steps further with IVS (intelligent video surveillance) features. This is because IP cameras are essentially small computers themselves, whereas all the processing in an analog system is done at the DVR. This gives an NVR system much more processing power than a DVR. IVS features are more useful than just motion detection because they are far more precise. Some of the most popular IVS features are tripwires, auto-tracking, and missing and abandoned objects. Tripwires allow the user to receive push notifications if there is movement across a line that the user has set up within the image. They can also adjust for the size of the object. This helps the user be very specific and avoid false notifications. For example, instead of being notified every time that something in the backyard moves, you can be notified only when someone opens the gate. Auto-tracking with a PTZ camera allows the user to lock onto and track an object as it moves within the camera's field of view. The missing and abandoned object features allow the user to be notified if a specific item has been moved, or if something new has been left in the field of view. As technology advances NVR systems and cameras will be able to perform at higher and higher levels, while the technology for DVR system is not expected to grow much more from its current levels. The table below shows a quick summary of the key points in this article.