How to ignore events due to lighting changes

[marcmerlin]

With motion(1) there was a magic setting to have it ignore changes in light (as in a light turning on at night and making most of the frame lit, or my camera turning on its infrared LEDs)

With ZM, I have no idea how to do this. I tried both pixels and blobs, and I tried to ignore changes of more than 50%, that doesn't seem to do it.

Is there a way to setup a zone not to trigger on light changes?

Thanks

[bb99]

Try: "Overload Frame Ignore Count" in zone settings.

[marcmerlin]

Thanks for pointing that out.
I don't actually see it documented in
http://www.zoneminder.com/wiki/index.php/Documentation

Is it documented elsewhere?
How do I know how it works and what value(s) to put in there?

Thanks.

[bb99]

For sudden changes to the environment, no better tool then Overload Frame Ignore Count. Your fps determines these settings but at 10 fps with Overload Frame Ignore Count set to 4, it only ignors .4 seconds. In other words if a drastic change to the lighting (such as a car with headlights on in darkness) passes within the monitors view it will ignore the number of frames you specify before processing for motion detection.

[marcmerlin]

Thanks, much appreciated.

[bb99]

You can also create a small zone for an offending light and set it to inactive. This works very well for TV's or motion sensitive lights.