IVS Tripwire on Dahua

bug99

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Has anyone written up a guide of sorts on IVS Tripwire on Dahua cameras (ex IPC-HFW5231E-Z5)? I seem to struggle to understand the logic.

There is a “detection zone”. Should this be used big to the boarder of the frame to allow time for an object to be noticed before the trip lines, unless there is a lot of noise causing false triggers that necessitate making it smaller?

Are the tripwire rules “OR” or “AND”? In other words, does an object that crosses any rule cause a trigger, or does it take an object crossing all active rules to cause a trigger?

Does a zig-zag rule make the rule more sensitive or less sensitive?

What does the “Parameters” tab sensitivity do? Is this minimum pixel change or contrast or velocity of change for each rule?

How does an intrusion area differ from a trip wire area (enclosed polygon)?

In the past, I have noticed a person needs to be seen (trigger level 1), then cross a line (trigger level 2), and then exit a line (trigger level 3) to count as a trigger in the recording. Perhaps I am wrong in this, but it seems to be what I have seen when I get it to work.

I have also heard that changing the "Encode" "Smart Code" to closed vs open has an affect, but perhaps this is only with an incompatible NVR.
 

bug99

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The Wiki does not really address any of my above issues. What is needed is more of a best practices. If i get through this, maybe i will write one.

Adding to the tripwire mysteries: I have noticed when i do get the setup working that strangely it is far more sensitive/responsive to small people than to large people. It appears that large people cross multiple lines and are not preferably identified as a moved object crossing a line, exactly the opposite of what would be expected.
 
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