Object detection false positives
I have a camera facing the road down my driveway. I have a mask setup on the Trigger tab (green colored) to mask cars on the street so that my action is only triggered if a car pulls down the driveway. However, I do get false positives (SS says there's a car in the driveway when there is not).
I've tried increasing my detection threshold to 80 for vehicles (motion sensitivity at 50 and 1.5sec work well), but still getting false positive triggers.
I am wondering next what this sentence means as I can't quite understand it. It's an option that is unchecked by default under motion detection options. Yes, I've read the tooltip which does not clarify for me.
Motion mask also applies AI object detection and image thumbnail creation
Does this mean that the Motion mask also BLOCKS AI object detection and image thumbnail creation in the area masked? Or that Motion mask does NOT BLOCK AI object detection and image thumbnail creation in the area masked?
Comments
Motion is detected in only the non-masked areas. But, by default, upon motion being detected, the whole area that encompasses the moving object(s) is send to the AI for classification, and this can include pixels under the mask. The reason for this is to prevent partial objects (e.g. someone's legs only, or a small part of a moving car) from being sent to the AI, which could lead to less accurate classification.
However, it does mean that moving objets that are mostly in the masked area can cause triggers, which can be surprising. This could be what is happening in your case. The option you refer to prevents this from happening - when checked, only non-masked pixels are sent to the AI. In your case, with this option turned on, the cars on the street should not cause triggers (which will hopefully fix your problem), at the expense of potentially slightly reduced detection accuracy for objects that are near the edges of the mask.
I made the change yesterday and seems to be exactly what I needed.