ZoneMinder Forums

Hi there,
Seem to now have my system firing on all cylinders and reporting correctly
I have a feeling this may be possible with the changes you made to MQTT, but how do I track the number of objects detected. I was previously using Deepstack and the JSON parsed to MQTT would be:
{
“Person” : “2”,
“Car” : “1”
}
Right now I have an issue / challenge where there is a car on the drive. So any motion occurring fires an alert indicating a car is detected (but obviously not a new car).

Previously I just added a global value of car in Node-Red, and if that value increased by 1 then fire the alert. This was useful as if 2 cars were there, it only fired when the new ones arrived the first time. Not every time any motion caused and alarm.

Any thoughts?

1. The JSON lists all the objects detected, so to count "car" you can simply total the # of "car" objects in the returned JSON
2. With regards to stationary objects not showing up again, check out "match_past_detections" in objectconfig.

Epic, thank you! Appreciate you taking the time to respond!

If I change "past_det_max_diff_area=5%" to 10% or set a lower value, what is happening then?

Johnny1337 wrote: ↑Tue Feb 04, 2020 8:40 pm If I change "past_det_max_diff_area=5%" to 10% or set a lower value, what is happening then?

Exactly what the text above it says. In other words, a stationery object doesn't always have the same "bounding box" around it. Let's assume you have a car standing still - if you ran object detection, you'd see the "bounding box" jiggle around. The change in box is due to different lighting conditions, other objects etc. So this setting gives you a "variation" control which basically says: If the new box is within X% distance of a previously detected box of the same category, assume its the same.