ZoneMinder Forums

Hi,
I'm trying to configure ES with hook to trigger alarm when a person crosses an area defined in configuration monitor.
The monitor section in objectconfig.ini is defined like this: In object section the object_min_confidence=0.5

In general it works fine, but when the light suddenly changes (for example with the light car) an event is triggered and analysed by hook. Then i get a person detection of 54.09% in the enclosed objdetect.jpg picture. As you can see it's not a person but a little tree which moreover is not in the defined areas.
Is it possible to avoid such false alarm ? Thanks for your help

There are multiple ways
1. Increase your confidence level (say 0.6)
2. Make sure you are using the right detection model (don’t use tiny yolo). Experiment with others if yolov4 isn’t working for you.

FYI OD Checks if the object is in your defined polygons by matching the rectangle around the object with your zones. As you see the rectangle around the “person” intersects with one of your polygons.

Thanks for your answer.
As I have levels above 70% I am afraid of missing real alarms. Reducing my zones could have the same result. So i try a workaround. As i use API script notification, i created a python script to compare the false alarm picture kept as reference with the current event picture. If the pictures are similar then i don't send notification.
I use the histogram comparison from opencv to compare the pictures.
I'll let you know if it works after some days of testing.

I have a similar problem with a ceiling fan being declared a person any time motion is detected elsewhere in the field of view.

in objectconfig.ini there is a line for This helped, it would only declare the ceiling fan as a person once and then not again. But it seems to reset at some point, I don't know what causes it to reset but false detections went down almost 90% with this setting.

Another thing is you can try messing with overload frame count in the zone configuration. A setting of 2 or 3 stopped events being triggered by headlights sweeping over my driveway from cars driving by at night. It doesn't appear like doing this has hindered finding a person or animal in my driveway, I am recording at 25fps so 3 frames isn't much.