I had a number of IVS triggers last night from a small object in a spider web (see video). This is on one of the cameras (5442 series) running the new FW 11-05-21 with Intrusion detection box. I originally had the sensitivity set to 6, because I do not get any animal intrusions in this screen enclosure. I set the sensitivity to 5 and increased the minimum size to at least 2 times the size of this circular blob, and still got false IVS triggers (See insert) . That was a little disturbing, since I have filtered out animals in the past with min size objects. I personally feel that you should never keep min size at 0,0. Yes, this camera is properly calibrated with Global Setup. All light is from camera IR and external
IR light. no visible light.
On a positive note I have had very good results with this FW version during rain storms, tree canopy moving shadows and fog. FW does have algorithm problems discriminating animals and "blobs moving around. Overall, I am happy with the IVS performance, but feel the algorithms are still in their infancy and need some improvement. Hopefully, some of this information gets back to the Dahua FW guys, so they can make future improvements. Someone else stated that "you are expecting too much". That may well be true, but hopefully things will get better. If people don't provide more feedback on their experiences, changes may be slow in coming.