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The minimum box has to be both narrower than the target and shorter than the target from the cameras perspective at that point in the field of view; IE they must meet those sizes before they reach the line.
I've no evidence of that but it's what I would assume. If it were a random square/rectangle it would be just looking at volume of pixels x times y. The main thing is that you do those sizes according to the position of the line. In your case minimum needs to be smaller than the area of a human before they reach the line coming up the drive toward the door. As you've set the line crossing bi directional, like intrusion, maximum would need to be set to the maximum area of a person that's stood just outside your side door. I'd always recommend making minimum too small and maximum too large; ensure all required targets are triggering an event and then adjust sizes for false alert reduction.Thanks for that info.
I wasn't aware that the target had to breach both height AND width of the 'min' box to be deemed valid.
In all the examples I have seen for setting max/min boxes, including Hik's own documentation, they are all drawn as squares rather than rectangles. I naturally assumed that if a potential target was either larger in height OR width it would be deemed valid and trigger.