Line Crossing Detection Intermittently Failing at Night

[carphone]

Hi All

I am still a newbie at much of this but have been fine tuning my settings as best I can. I recently noticed that my line crossing detection was not being tripped for some vehicles at night. I would say it works 75% of the time at night and is perfect in the day time.

Check out the video to see what I mean (you will see the line does not go red):

First thoughts are the headlights are giving the algorithm a hard time. Are there any settings that would improve this? Or maybe if i upgrade to an I series NVR it will have more processing power (currently using a 4CH K series)?

Camera is a 4MP ColorVu - both Camera and NVR on the latest software.

Thanks as always!

Dan

 

[Tolting Colt Acres]

yup. Had this problem myself. Fiddled with it for weeks. Eventually gave up.

 

[coney27]

What are the settings you have set for the smart event line crossing?

 

[carphone]

thanks for the quick replies.

Settings in pic

thanks again

Dan

 

[alastairstevenson]

First thoughts are the headlights are giving the algorithm a hard time. Are there any settings that would improve this?

What's the maximum object size set to?
Try setting it to maximum, see if that changes anything.

 

[carphone]

just logged into the camera to check this (rather than the NVR).

I have not played with these settings - do they look OK?

Thanks again

Dan

 

[carphone]

As I have not set a min and max before and its not clear what the defaults are - I have just drawn the biggest possible box for max and a tiny square for min.

Will see how this goes.

On a side question - do we think an I series NVR would do a better job than the K series on this? Thinking faster processor and version 4 software might help..?

Thanks again

Dan

 

[alastairstevenson]

I have not played with these settings - do they look OK?

Well, if that doesn't work, there's nowhere else to go!
I have my fingers crossed that it makes a difference.

 

[carphone]

Update - still happening even though I added my own min and max boxes.

I am going to try switching to H264 as an experiment, I worry 265 is too processor intensive and so causes this issue. Will let you know if that works.

Failing that - will try an I series NVR rather than K.

Thanks