The guy who owns a 3 acre field of grass and scrub behind our garden has decided to attempt to mow all of it with a domestic 18" rotary mower and it's driving us insane. We've put up with endless mowing for 8 hours a day for over a week, he refuses to stop so I decided to use BI to gather evidence of his activities to use later in court or whatever. I set up a new HD camera on our garage with a good view of most of the field, some near, some far, and set it running. It records if I go and walk past at close range, but when the guy turns up with the mower, if he's more than about 20ft away it doesn't record anything. However, if I turn on 'highlighting' it surrounds him with blue and yellow rectangles as he walks across the field even in the far distance, so it seems that motion is being detected but recording is not being triggered. I set min. object size to 100, min. contrast to 12, min. duration to 0.3, and object detection 'travels pixels' to 16. I can't think of anything else I can do to make the recording trigger any more sensitive, any ideas please?