Parked Cars & Trigger Zones

[svalvasori]

1. How does everyone deal with parked cars? Unless the new car happens to block the parked car's plate, I get two plates. I'm sending the data to ALPR, is that where the MEMO field comes into play or can I ignore static objects somehow?

2. What is the most successful motion settings/zones for a one camera setup? I find it easy when a car approaches the camera, but less reliable the other direction. If I make the zone too small or to one side, then the plate isn't always captured in that part of the image. Hoping to get some best practices.

 

[wittaj]

I use the static images option to reduce the parked cars.


Everyone has a different field of view and angle, so it really comes down to trial and error with your angle, field of view, and height.

Here is mine where I have a zone drawn such that cars going right to left I get the front plate, and the cars going left to right I get the back plate. You can see in my alert images that the vehicles are all centered in the frame doing this approach.

Prior to AI in BI, it took a lot of messing around with motion zones to make it happen.

Now with CodeProject you can have it create the image with the plate in it and send that image instead.

 

[svalvasori]

That's almost exactly what I was using, but then realized that the motion zone was the only part of the image used for AI recognition. If the plate is outside of that, it doesn't read the plate. Like this:


Also wondering about parked cars? I got the same plate 70 times tonight of a parked car. Also as two plates as it was about 50/50 on if a 'D' was actually a D or O.